diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06c2fbf..2f5be19 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,23 +30,34 @@ endif()
 
 set(SOURCES
   src/main.cpp
-  src/MainWindow.cpp
+  src/AppShell.cpp
+  src/LauncherHomeWidget.cpp
+  src/ProfileComparePage.cpp
   src/DoseImage.cpp
   src/ImageManager.cpp
   src/SliceViewWidget.cpp
   src/ProfilePlotWidget.cpp
   src/ImageListPanel.cpp
+  src/dvh/DvhComparePage.cpp
+  src/dvh/DvhPlotWidget.cpp
+  src/dvh/dcmIO.cpp
   resources/resources.qrc
 )
 
 set(HEADERS
   src/types.h
-  src/MainWindow.h
+  src/AppShell.h
+  src/LauncherHomeWidget.h
+  src/ProfileComparePage.h
   src/DoseImage.h
   src/ImageManager.h
   src/SliceViewWidget.h
   src/ProfilePlotWidget.h
   src/ImageListPanel.h
+  src/dvh/DvhComparePage.h
+  src/dvh/DvhPlotWidget.h
+  src/dvh/dvhTypes.h
+  src/dvh/dcmIO.h
 )
 
 if(WIN32)
@@ -55,7 +66,10 @@ if(WIN32)
 endif()
 
 add_executable(DoseCompare ${SOURCES} ${HEADERS} ${APP_ICON_RC})
-target_include_directories(DoseCompare PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_include_directories(DoseCompare PRIVATE
+  ${CMAKE_CURRENT_SOURCE_DIR}/src
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/dvh
+)
 target_link_libraries(DoseCompare PRIVATE
   Qt5::Core Qt5::Gui Qt5::Widgets
   ${ITK_LIBRARIES}
@@ -68,7 +82,18 @@ target_link_libraries(smoke_slice_test PRIVATE Qt5::Core Qt5::Gui ${ITK_LIBRARIE
 
 if(MSVC)
   target_compile_options(DoseCompare PRIVATE /utf-8 /W3 /EHsc)
-  target_compile_definitions(DoseCompare PRIVATE _CRT_SECURE_NO_WARNINGS)
+  target_compile_definitions(DoseCompare PRIVATE _CRT_SECURE_NO_WARNINGS NOMINMAX WIN32_LEAN_AND_MEAN)
   target_compile_options(smoke_slice_test PRIVATE /utf-8 /W3 /EHsc)
   target_compile_definitions(smoke_slice_test PRIVATE _CRT_SECURE_NO_WARNINGS)
 endif()
+
+# Runtime algo DLL next to the executable
+add_custom_command(TARGET DoseCompare POST_BUILD
+  COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:DoseCompare>/algo
+  COMMAND ${CMAKE_COMMAND} -E copy_if_different
+          ${CMAKE_SOURCE_DIR}/algo/calcDVHLibrary.dll
+          $<TARGET_FILE_DIR:DoseCompare>/algo/calcDVHLibrary.dll
+  COMMAND ${CMAKE_COMMAND} -E copy_if_different
+          ${CMAKE_SOURCE_DIR}/algo/calcDVHLibraryD.dll
+          $<TARGET_FILE_DIR:DoseCompare>/algo/calcDVHLibraryD.dll
+)
diff --git a/algo/calcDVHLibrary.dll b/algo/calcDVHLibrary.dll
new file mode 100644
index 0000000..64b8536
Binary files /dev/null and b/algo/calcDVHLibrary.dll differ
diff --git a/algo/calcDVHLibraryD.dll b/algo/calcDVHLibraryD.dll
new file mode 100644
index 0000000..ee1e7aa
Binary files /dev/null and b/algo/calcDVHLibraryD.dll differ
diff --git a/resources/app-dvh.png b/resources/app-dvh.png
new file mode 100644
index 0000000..0302c66
Binary files /dev/null and b/resources/app-dvh.png differ
diff --git a/resources/app-profile.png b/resources/app-profile.png
new file mode 100644
index 0000000..84ac458
Binary files /dev/null and b/resources/app-profile.png differ
diff --git a/resources/resources.qrc b/resources/resources.qrc
index 75ee518..1afee1b 100644
--- a/resources/resources.qrc
+++ b/resources/resources.qrc
@@ -3,5 +3,7 @@
   <qresource prefix="/">
     <file>dosecompare.png</file>
     <file>dosecompare.ico</file>
+    <file>app-profile.png</file>
+    <file>app-dvh.png</file>
   </qresource>
 </RCC>
diff --git a/src/AppShell.cpp b/src/AppShell.cpp
new file mode 100644
index 0000000..eda2d18
--- /dev/null
+++ b/src/AppShell.cpp
@@ -0,0 +1,86 @@
+#include "AppShell.h"
+#include "LauncherHomeWidget.h"
+#include "ProfileComparePage.h"
+#include "dvh/DvhComparePage.h"
+
+#include <QStackedWidget>
+#include <QToolBar>
+#include <QAction>
+#include <QLabel>
+
+AppShell::AppShell(QWidget* parent)
+  : QMainWindow(parent)
+{
+  setWindowTitle(tr("DoseCompare"));
+  resize(1400, 900);
+
+  auto* tb = addToolBar(tr("导航"));
+  tb->setMovable(false);
+  tb->setFloatable(false);
+  m_backAct = tb->addAction(tr("← 返回主页"));
+  connect(m_backAct, &QAction::triggered, this, &AppShell::showHome);
+  tb->addSeparator();
+  auto* title = new QLabel(tr("  Dose Comparison & Analysis Tools"), this);
+  QFont titleFont = title->font();
+  titleFont.setPointSize(10);
+  titleFont.setBold(false);
+  title->setFont(titleFont);
+  title->setStyleSheet(QStringLiteral("color:#555b66; font-weight:400;"));
+  tb->addWidget(title);
+
+  m_stack = new QStackedWidget(this);
+  setCentralWidget(m_stack);
+
+  m_home = new LauncherHomeWidget(m_stack);
+  m_profile = new ProfileComparePage(m_stack);
+  m_dvh = new DvhComparePage(m_stack);
+
+  m_stack->addWidget(m_home);
+  m_stack->addWidget(m_profile);
+  m_stack->addWidget(m_dvh);
+
+  connect(m_home, &LauncherHomeWidget::openProfileRequested, this, &AppShell::openProfile);
+  connect(m_home, &LauncherHomeWidget::openDvhRequested, this, &AppShell::openDvh);
+
+  showHome();
+}
+
+void AppShell::showHome()
+{
+  m_stack->setCurrentWidget(m_home);
+  updateChrome();
+}
+
+void AppShell::openProfile()
+{
+  m_stack->setCurrentWidget(m_profile);
+  updateChrome();
+}
+
+void AppShell::openProfileApp()
+{
+  openProfile();
+}
+
+void AppShell::openDvh()
+{
+  m_stack->setCurrentWidget(m_dvh);
+  updateChrome();
+}
+
+void AppShell::openDvhApp()
+{
+  openDvh();
+}
+
+void AppShell::updateChrome()
+{
+  const bool onHome = (m_stack->currentWidget() == m_home);
+  m_backAct->setVisible(!onHome);
+  if (onHome)
+    setWindowTitle(tr("DoseCompare"));
+  else if (m_stack->currentWidget() == m_profile)
+    setWindowTitle(tr("DoseCompare — Profile Comparison"));
+  else
+    setWindowTitle(tr("DoseCompare — DVH Comparison"));
+}
diff --git a/src/AppShell.h b/src/AppShell.h
new file mode 100644
index 0000000..b432fa9
--- /dev/null
+++ b/src/AppShell.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <QMainWindow>
+
+class QStackedWidget;
+class LauncherHomeWidget;
+class ProfileComparePage;
+class DvhComparePage;
+
+class AppShell : public QMainWindow {
+  Q_OBJECT
+public:
+  explicit AppShell(QWidget* parent = nullptr);
+
+  ProfileComparePage* profilePage() const { return m_profile; }
+  void openProfileApp();
+  void openDvhApp();
+
+private slots:
+  void showHome();
+  void openProfile();
+  void openDvh();
+
+private:
+  void updateChrome();
+
+  QStackedWidget* m_stack = nullptr;
+  LauncherHomeWidget* m_home = nullptr;
+  ProfileComparePage* m_profile = nullptr;
+  DvhComparePage* m_dvh = nullptr;
+  QAction* m_backAct = nullptr;
+};
diff --git a/src/LauncherHomeWidget.cpp b/src/LauncherHomeWidget.cpp
new file mode 100644
index 0000000..b377850
--- /dev/null
+++ b/src/LauncherHomeWidget.cpp
@@ -0,0 +1,159 @@
+#include "LauncherHomeWidget.h"
+
+#include <QLabel>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+#include <QPixmap>
+#include <QImage>
+#include <QPainter>
+#include <QPainterPath>
+#include <QFont>
+#include <QColor>
+
+namespace {
+
+QPixmap prepareLauncherIcon(const QString& iconPath, int size, int radius)
+{
+  QPixmap src(iconPath);
+  if (src.isNull())
+    return QPixmap();
+
+  QImage img = src.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation)
+                 .toImage()
+                 .convertToFormat(QImage::Format_ARGB32);
+
+  for (int y = 0; y < img.height(); ++y) {
+    QRgb* line = reinterpret_cast<QRgb*>(img.scanLine(y));
+    for (int x = 0; x < img.width(); ++x) {
+      if (qRed(line[x]) > 235 && qGreen(line[x]) > 235 && qBlue(line[x]) > 235)
+        line[x] = qRgba(0, 0, 0, 0);
+    }
+  }
+
+  QPixmap out(size, size);
+  out.fill(Qt::transparent);
+  QPainter p(&out);
+  p.setRenderHint(QPainter::Antialiasing, true);
+  p.setRenderHint(QPainter::SmoothPixmapTransform, true);
+  QPainterPath clip;
+  clip.addRoundedRect(QRectF(0.5, 0.5, size - 1.0, size - 1.0), radius, radius);
+  p.setClipPath(clip);
+  p.drawImage(0, 0, img);
+  return out;
+}
+
+QPushButton* makeAppCard(const QString& title,
+                         const QString& subtitle,
+                         const QString& iconPath,
+                         QWidget* parent)
+{
+  auto* card = new QPushButton(parent);
+  card->setCursor(Qt::PointingHandCursor);
+  card->setFlat(true);
+  card->setMinimumSize(280, 340);
+  card->setMaximumWidth(360);
+  card->setAttribute(Qt::WA_StyledBackground, true);
+  card->setStyleSheet(
+    QStringLiteral(
+      "QPushButton {"
+      "  background-color: #f7f8fa;"
+      "  border: 1px solid #d0d5de;"
+      "  border-radius: 16px;"
+      "  text-align: center;"
+      "  padding: 20px 18px;"
+      "}"
+      "QPushButton:hover {"
+      "  background-color: #eef2f7;"
+      "  border: 1px solid #aeb6c4;"
+      "}"
+      "QPushButton:pressed {"
+      "  background-color: #e4e9f0;"
+      "}"));
+
+  auto* lay = new QVBoxLayout(card);
+  lay->setSpacing(14);
+  lay->setContentsMargins(22, 26, 22, 26);
+
+  auto* icon = new QLabel(card);
+  icon->setAlignment(Qt::AlignCenter);
+  icon->setFixedSize(148, 148);
+  icon->setStyleSheet(QStringLiteral("background: transparent; border: none;"));
+  const QPixmap pm = prepareLauncherIcon(iconPath, 148, 28);
+  if (!pm.isNull())
+    icon->setPixmap(pm);
+  icon->setAttribute(Qt::WA_TransparentForMouseEvents);
+  lay->addWidget(icon, 0, Qt::AlignHCenter);
+
+  auto* t = new QLabel(title, card);
+  t->setAlignment(Qt::AlignCenter);
+  QFont tf = t->font();
+  tf.setPointSize(15);
+  tf.setBold(true);
+  t->setFont(tf);
+  t->setStyleSheet(QStringLiteral("color:#2a3140; background:transparent; border:none;"));
+  t->setAttribute(Qt::WA_TransparentForMouseEvents);
+  lay->addWidget(t);
+
+  auto* s = new QLabel(subtitle, card);
+  s->setAlignment(Qt::AlignCenter);
+  s->setWordWrap(true);
+  s->setStyleSheet(QStringLiteral("color:#6a7385; background:transparent; border:none; font-size:12px;"));
+  s->setAttribute(Qt::WA_TransparentForMouseEvents);
+  lay->addWidget(s);
+  lay->addStretch(1);
+  return card;
+}
+
+} // namespace
+
+LauncherHomeWidget::LauncherHomeWidget(QWidget* parent)
+  : QWidget(parent)
+{
+  setAttribute(Qt::WA_StyledBackground, true);
+  setStyleSheet(QStringLiteral(
+    "LauncherHomeWidget {"
+    "  background: #f0f2f5;"
+    "}"));
+
+  auto* root = new QVBoxLayout(this);
+  root->setContentsMargins(48, 40, 48, 48);
+  root->setSpacing(28);
+
+  auto* brand = new QLabel(tr("Dose Comparison & Analysis Tools"), this);
+  QFont bf = brand->font();
+  bf.setPointSize(22);
+  bf.setBold(false);
+  brand->setFont(bf);
+  brand->setStyleSheet(QStringLiteral("color:#333945; background:transparent;"));
+  brand->setAlignment(Qt::AlignCenter);
+  root->addWidget(brand);
+
+  auto* hint = new QLabel(tr("选择一个应用开始"), this);
+  hint->setAlignment(Qt::AlignCenter);
+  hint->setStyleSheet(QStringLiteral("color:#7a8496; font-size:14px; background:transparent;"));
+  root->addWidget(hint);
+
+  auto* row = new QHBoxLayout();
+  row->setSpacing(36);
+  row->addStretch(1);
+
+  auto* profileCard = makeAppCard(
+    tr("Profile Comparison"),
+    tr("剂量三切面叠加与交线 Profile 对比"),
+    QStringLiteral(":/app-profile.png"),
+    this);
+  connect(profileCard, &QPushButton::clicked, this, &LauncherHomeWidget::openProfileRequested);
+  row->addWidget(profileCard);
+
+  auto* dvhCard = makeAppCard(
+    tr("DVH Comparison"),
+    tr("多剂量计划与结构勾画的 DVH 对比"),
+    QStringLiteral(":/app-dvh.png"),
+    this);
+  connect(dvhCard, &QPushButton::clicked, this, &LauncherHomeWidget::openDvhRequested);
+  row->addWidget(dvhCard);
+
+  row->addStretch(1);
+  root->addLayout(row, 1);
+}
diff --git a/src/LauncherHomeWidget.h b/src/LauncherHomeWidget.h
new file mode 100644
index 0000000..24909a4
--- /dev/null
+++ b/src/LauncherHomeWidget.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <QWidget>
+
+class LauncherHomeWidget : public QWidget {
+  Q_OBJECT
+public:
+  explicit LauncherHomeWidget(QWidget* parent = nullptr);
+
+signals:
+  void openProfileRequested();
+  void openDvhRequested();
+};
diff --git a/src/MainWindow.cpp b/src/ProfileComparePage.cpp
similarity index 81%
rename from src/MainWindow.cpp
rename to src/ProfileComparePage.cpp
index 5e02317..779d6f5 100644
--- a/src/MainWindow.cpp
+++ b/src/ProfileComparePage.cpp
@@ -1,4 +1,4 @@
-#include "MainWindow.h"
+#include "ProfileComparePage.h"
 #include "ImageManager.h"
 #include "ImageListPanel.h"
 #include "SliceViewWidget.h"
@@ -10,14 +10,12 @@
 #include <QSlider>
 #include <QLabel>
 #include <QToolBar>
-#include <QStatusBar>
 #include <QHBoxLayout>
 #include <QVBoxLayout>
 #include <QGridLayout>
 #include <QGroupBox>
 #include <QAction>
-#include <QMenuBar>
-#include <QMenu>
+#include <QPushButton>
 #include <QSettings>
 #include <QFileInfo>
 #include <QDir>
@@ -30,29 +28,34 @@
 #include <algorithm>
 #include <initializer_list>
 
-MainWindow::MainWindow(QWidget* parent)
-  : QMainWindow(parent)
+ProfileComparePage::ProfileComparePage(QWidget* parent)
+  : QWidget(parent)
 {
   m_manager = new ImageManager(this);
   buildUi();
   setAcceptDrops(true);
 
-  connect(m_manager, &ImageManager::imageListChanged, this, &MainWindow::refreshImageSelectors);
-  connect(m_manager, &ImageManager::profileSelectionChanged, this, &MainWindow::refreshProfiles);
-
-  resize(1400, 900);
-  setWindowTitle(tr("DoseCompare — 剂量三切面对比"));
+  connect(m_manager, &ImageManager::imageListChanged, this, &ProfileComparePage::refreshImageSelectors);
+  connect(m_manager, &ImageManager::profileSelectionChanged, this, &ProfileComparePage::refreshProfiles);
 }
 
-MainWindow::~MainWindow() = default;
+ProfileComparePage::~ProfileComparePage() = default;
 
-void MainWindow::buildUi()
+void ProfileComparePage::buildUi()
 {
-  auto* importAct = new QAction(tr("导入剂量..."), this);
-  connect(importAct, &QAction::triggered, this, &MainWindow::onImportDose);
-  menuBar()->addMenu(tr("文件"))->addAction(importAct);
+  auto* pageLay = new QVBoxLayout(this);
+  pageLay->setContentsMargins(0, 0, 0, 0);
+  pageLay->setSpacing(0);
+
+  auto* topBar = new QWidget(this);
+  auto* tb = new QHBoxLayout(topBar);
+  tb->setContentsMargins(8, 6, 8, 6);
+  tb->setSpacing(8);
+
+  auto* importBtn = new QPushButton(tr("导入剂量..."), this);
+  connect(importBtn, &QPushButton::clicked, this, &ProfileComparePage::onImportDose);
+  tb->addWidget(importBtn);
 
-  auto* tb = addToolBar(tr("对比"));
   tb->addWidget(new QLabel(tr(" Background "), this));
   m_bgCombo = new QComboBox(this);
   m_bgCombo->setMinimumWidth(160);
@@ -70,7 +73,6 @@ void MainWindow::buildUi()
   m_opacityLabel = new QLabel(tr("50%"), this);
   tb->addWidget(m_opacityLabel);
 
-  tb->addSeparator();
   tb->addWidget(new QLabel(tr(" Colormap "), this));
   m_colorMapCombo = new QComboBox(this);
   m_colorMapCombo->blockSignals(true);
@@ -81,22 +83,24 @@ void MainWindow::buildUi()
   m_colorMapCombo->setMinimumWidth(110);
   m_colorMapCombo->blockSignals(false);
   tb->addWidget(m_colorMapCombo);
+  tb->addStretch(1);
+  pageLay->addWidget(topBar);
 
   connect(m_bgCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
-          this, &MainWindow::onBackgroundChanged);
+          this, &ProfileComparePage::onBackgroundChanged);
   connect(m_frontCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
-          this, &MainWindow::onFrontChanged);
-  connect(m_opacitySlider, &QSlider::valueChanged, this, &MainWindow::onOpacityChanged);
+          this, &ProfileComparePage::onFrontChanged);
+  connect(m_opacitySlider, &QSlider::valueChanged, this, &ProfileComparePage::onOpacityChanged);
   connect(m_colorMapCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
-          this, &MainWindow::onColorMapChanged);
+          this, &ProfileComparePage::onColorMapChanged);
 
   auto* central = new QWidget(this);
-  setCentralWidget(central);
   auto* root = new QHBoxLayout(central);
+  pageLay->addWidget(central, 1);
 
   m_listPanel = new ImageListPanel(m_manager, this);
   m_listPanel->setFixedWidth(220);
-  connect(m_listPanel, &ImageListPanel::requestDelete, this, &MainWindow::onDeleteImage);
+  connect(m_listPanel, &ImageListPanel::requestDelete, this, &ProfileComparePage::onDeleteImage);
   root->addWidget(m_listPanel);
 
   auto* right = new QVBoxLayout();
@@ -113,19 +117,19 @@ void MainWindow::buildUi()
     slider->setRange(0, 0);
     col->addWidget(slider);
     sliceRow->addLayout(col, 1);
-    connect(view, &SliceViewWidget::cursorChanged, this, &MainWindow::onCursorChanged);
-    connect(view, &SliceViewWidget::viewExtentChanged, this, &MainWindow::refreshProfiles);
-    connect(view, &SliceViewWidget::zoomScaleChanged, this, &MainWindow::onZoomScaleChanged);
-    connect(view, &SliceViewWidget::panWorldDelta, this, &MainWindow::onPanWorldDelta);
+    connect(view, &SliceViewWidget::cursorChanged, this, &ProfileComparePage::onCursorChanged);
+    connect(view, &SliceViewWidget::viewExtentChanged, this, &ProfileComparePage::refreshProfiles);
+    connect(view, &SliceViewWidget::zoomScaleChanged, this, &ProfileComparePage::onZoomScaleChanged);
+    connect(view, &SliceViewWidget::panWorldDelta, this, &ProfileComparePage::onPanWorldDelta);
   };
   addSliceCol(ViewAxis::Axial, m_axial, m_sliderAxial, tr("1 轴位 (Axial)"));
   addSliceCol(ViewAxis::Sagittal, m_sagittal, m_sliderSagittal, tr("2 矢状 (Sagittal)"));
   addSliceCol(ViewAxis::Coronal, m_coronal, m_sliderCoronal, tr("3 冠状 (Coronal)"));
   right->addLayout(sliceRow, 3);
 
-  connect(m_sliderAxial, &QSlider::valueChanged, this, &MainWindow::onSliceSliderChanged);
-  connect(m_sliderSagittal, &QSlider::valueChanged, this, &MainWindow::onSliceSliderChanged);
-  connect(m_sliderCoronal, &QSlider::valueChanged, this, &MainWindow::onSliceSliderChanged);
+  connect(m_sliderAxial, &QSlider::valueChanged, this, &ProfileComparePage::onSliceSliderChanged);
+  connect(m_sliderSagittal, &QSlider::valueChanged, this, &ProfileComparePage::onSliceSliderChanged);
+  connect(m_sliderCoronal, &QSlider::valueChanged, this, &ProfileComparePage::onSliceSliderChanged);
 
   auto* profRow = new QHBoxLayout();
   m_profAxial = new ProfilePlotWidget(ViewAxis::Axial, this);
@@ -142,11 +146,13 @@ void MainWindow::buildUi()
   profRow->addWidget(m_profCoronal, 1);
   right->addLayout(profRow, 2);
 
-  statusBar()->showMessage(
-    tr("可拖入 mhd/nii/dcm。Ctrl+在1/2/3上移动可重切另两面。"));
+  m_statusLabel = new QLabel(
+    tr("可拖入 mhd/nii/dcm。Ctrl+在1/2/3上移动可重切另两面。"), this);
+  m_statusLabel->setContentsMargins(8, 4, 8, 4);
+  pageLay->addWidget(m_statusLabel);
 }
 
-QString MainWindow::defaultOpenDir() const
+QString ProfileComparePage::defaultOpenDir() const
 {
   QSettings settings(QStringLiteral("Manteia"), QStringLiteral("DoseCompare"));
   const QString last = settings.value(QStringLiteral("lastOpenDir")).toString();
@@ -155,7 +161,7 @@ QString MainWindow::defaultOpenDir() const
   return QCoreApplication::applicationDirPath();
 }
 
-void MainWindow::rememberOpenPath(const QString& path)
+void ProfileComparePage::rememberOpenPath(const QString& path)
 {
   const QString dir = QFileInfo(path).absolutePath();
   if (dir.isEmpty())
@@ -164,7 +170,7 @@ void MainWindow::rememberOpenPath(const QString& path)
   settings.setValue(QStringLiteral("lastOpenDir"), dir);
 }
 
-bool MainWindow::isSupportedDosePath(const QString& path) const
+bool ProfileComparePage::isSupportedDosePath(const QString& path) const
 {
   const QString lower = path.toLower();
   return lower.endsWith(QStringLiteral(".mhd")) || lower.endsWith(QStringLiteral(".mha"))
@@ -172,7 +178,7 @@ bool MainWindow::isSupportedDosePath(const QString& path) const
       || lower.endsWith(QStringLiteral(".dcm")) || lower.endsWith(QStringLiteral(".dicom"));
 }
 
-void MainWindow::onImportDose()
+void ProfileComparePage::onImportDose()
 {
   const QString path = QFileDialog::getOpenFileName(
     this, tr("导入剂量图像"), defaultOpenDir(),
@@ -185,7 +191,7 @@ void MainWindow::onImportDose()
     QMessageBox::warning(this, tr("导入失败"), err.isEmpty() ? tr("未知错误") : err);
 }
 
-void MainWindow::dragEnterEvent(QDragEnterEvent* event)
+void ProfileComparePage::dragEnterEvent(QDragEnterEvent* event)
 {
   if (!event->mimeData() || !event->mimeData()->hasUrls()) {
     event->ignore();
@@ -200,7 +206,7 @@ void MainWindow::dragEnterEvent(QDragEnterEvent* event)
   event->ignore();
 }
 
-void MainWindow::dropEvent(QDropEvent* event)
+void ProfileComparePage::dropEvent(QDropEvent* event)
 {
   if (!event->mimeData() || !event->mimeData()->hasUrls()) {
     event->ignore();
@@ -229,7 +235,7 @@ void MainWindow::dropEvent(QDropEvent* event)
     event->ignore();
 }
 
-void MainWindow::applyBgFgAfterLoad(const QString& newId, int countBefore)
+void ProfileComparePage::applyBgFgAfterLoad(const QString& newId, int countBefore)
 {
   m_pendingBgId.clear();
   m_pendingFgId.clear();
@@ -243,7 +249,7 @@ void MainWindow::applyBgFgAfterLoad(const QString& newId, int countBefore)
   }
 }
 
-void MainWindow::promoteBgFgAfterDelete(const QString& deletedId, const QString& oldBg,
+void ProfileComparePage::promoteBgFgAfterDelete(const QString& deletedId, const QString& oldBg,
                                         const QString& oldFg)
 {
   // 在 remove 之前根据“删除后”的逻辑准备 pending；remove 时 list 仍含 deleted
@@ -287,7 +293,7 @@ void MainWindow::promoteBgFgAfterDelete(const QString& deletedId, const QString&
   m_hasPendingRoles = true;
 }
 
-bool MainWindow::loadDoseFile(const QString& path, QString* error)
+bool ProfileComparePage::loadDoseFile(const QString& path, QString* error)
 {
   const int countBefore = m_manager->images().size();
   QString err;
@@ -312,11 +318,12 @@ bool MainWindow::loadDoseFile(const QString& path, QString* error)
   refreshImageSelectors();
   refreshViews();
   refreshProfiles();
-  statusBar()->showMessage(tr("已加载: %1").arg(path), 5000);
+  if (m_statusLabel)
+    m_statusLabel->setText(tr("已加载: %1").arg(path));
   return true;
 }
 
-void MainWindow::onDeleteImage(const QString& id)
+void ProfileComparePage::onDeleteImage(const QString& id)
 {
   const QString oldBg = currentBgId();
   const QString oldFg = currentFgId();
@@ -327,22 +334,22 @@ void MainWindow::onDeleteImage(const QString& id)
   refreshProfiles();
 }
 
-QString MainWindow::currentBgId() const
+QString ProfileComparePage::currentBgId() const
 {
   return m_bgCombo->currentData().toString();
 }
 
-QString MainWindow::currentFgId() const
+QString ProfileComparePage::currentFgId() const
 {
   return m_frontCombo->currentData().toString();
 }
 
-DoseImage::Pointer MainWindow::bgDose() const
+DoseImage::Pointer ProfileComparePage::bgDose() const
 {
   return m_manager->imageById(currentBgId());
 }
 
-DoseImage::Pointer MainWindow::fgDose() const
+DoseImage::Pointer ProfileComparePage::fgDose() const
 {
   const QString id = currentFgId();
   if (id.isEmpty() || id == currentBgId())
@@ -350,7 +357,7 @@ DoseImage::Pointer MainWindow::fgDose() const
   return m_manager->imageById(id);
 }
 
-void MainWindow::refreshImageSelectors()
+void ProfileComparePage::refreshImageSelectors()
 {
   QString oldBg = currentBgId();
   QString oldFg = currentFgId();
@@ -400,19 +407,19 @@ void MainWindow::refreshImageSelectors()
   m_frontCombo->blockSignals(false);
 }
 
-void MainWindow::onFrontChanged(int)
+void ProfileComparePage::onFrontChanged(int)
 {
   refreshViews();
 }
 
-void MainWindow::onBackgroundChanged(int)
+void ProfileComparePage::onBackgroundChanged(int)
 {
   refreshViews();
   syncSliceSliders();
   refreshProfiles();
 }
 
-void MainWindow::onOpacityChanged(int value)
+void ProfileComparePage::onOpacityChanged(int value)
 {
   m_opacityLabel->setText(QStringLiteral("%1%").arg(value));
   const double op = value / 100.0;
@@ -421,7 +428,7 @@ void MainWindow::onOpacityChanged(int value)
   m_coronal->setOpacity(op);
 }
 
-void MainWindow::onColorMapChanged(int)
+void ProfileComparePage::onColorMapChanged(int)
 {
   if (!m_colorMapCombo || !m_axial)
     return;
@@ -431,7 +438,7 @@ void MainWindow::onColorMapChanged(int)
   m_coronal->setColorMap(map);
 }
 
-void MainWindow::refreshViews()
+void ProfileComparePage::refreshViews()
 {
   auto bg = bgDose();
   auto fg = fgDose();
@@ -455,7 +462,7 @@ void MainWindow::refreshViews()
   syncSliceSliders();
 }
 
-void MainWindow::syncSharedZoomFromViews()
+void ProfileComparePage::syncSharedZoomFromViews()
 {
   if (!m_axial || !m_sagittal || !m_coronal)
     return;
@@ -468,7 +475,7 @@ void MainWindow::syncSharedZoomFromViews()
   m_blockViewSync = false;
 }
 
-void MainWindow::onZoomScaleChanged(double parallelScale)
+void ProfileComparePage::onZoomScaleChanged(double parallelScale)
 {
   if (m_blockViewSync)
     return;
@@ -480,7 +487,7 @@ void MainWindow::onZoomScaleChanged(double parallelScale)
   m_blockViewSync = false;
 }
 
-void MainWindow::onPanWorldDelta(double dx, double dy, double dz)
+void ProfileComparePage::onPanWorldDelta(double dx, double dy, double dz)
 {
   if (m_blockViewSync)
     return;
@@ -495,7 +502,7 @@ void MainWindow::onPanWorldDelta(double dx, double dy, double dz)
   m_blockViewSync = false;
 }
 
-void MainWindow::syncSliceSliders()
+void ProfileComparePage::syncSliceSliders()
 {
   auto bg = bgDose();
   if (!bg) {
@@ -536,7 +543,7 @@ void MainWindow::syncSliceSliders()
   Q_UNUSED(origin);
 }
 
-void MainWindow::onSliceSliderChanged(int)
+void ProfileComparePage::onSliceSliderChanged(int)
 {
   if (m_blockSliders)
     return;
@@ -563,12 +570,12 @@ void MainWindow::onSliceSliderChanged(int)
   Q_UNUSED(origin);
 }
 
-void MainWindow::onCursorChanged(Vec3d world)
+void ProfileComparePage::onCursorChanged(Vec3d world)
 {
   setCursor(world, false);
 }
 
-void MainWindow::setCursor(const Vec3d& world, bool fromSlider)
+void ProfileComparePage::setCursor(const Vec3d& world, bool fromSlider)
 {
   m_cursor = world;
   m_axial->setCursorWorld(m_cursor);
@@ -579,12 +586,12 @@ void MainWindow::setCursor(const Vec3d& world, bool fromSlider)
   refreshProfiles();
 }
 
-void MainWindow::refreshProfiles()
+void ProfileComparePage::refreshProfiles()
 {
   extractProfiles();
 }
 
-void MainWindow::extractProfiles()
+void ProfileComparePage::extractProfiles()
 {
   QVector<ProfileSeries> alongX, alongY, alongZ;
   auto bg = bgDose();
diff --git a/src/MainWindow.h b/src/ProfileComparePage.h
similarity index 91%
rename from src/MainWindow.h
rename to src/ProfileComparePage.h
index 3ab9198..63d335a 100644
--- a/src/MainWindow.h
+++ b/src/ProfileComparePage.h
@@ -1,9 +1,9 @@
-#pragma once
+#pragma once
 
 #include "types.h"
 #include "DoseImage.h"
 
-#include <QMainWindow>
+#include <QWidget>
 #include <QString>
 
 class ImageManager;
@@ -16,11 +16,11 @@ class QLabel;
 class QDragEnterEvent;
 class QDropEvent;
 
-class MainWindow : public QMainWindow {
+class ProfileComparePage : public QWidget {
   Q_OBJECT
 public:
-  explicit MainWindow(QWidget* parent = nullptr);
-  ~MainWindow() override;
+  explicit ProfileComparePage(QWidget* parent = nullptr);
+  ~ProfileComparePage() override;
 
   bool loadDoseFile(const QString& path, QString* error = nullptr);
 
@@ -86,4 +86,5 @@ private:
   QString m_pendingFgId;
   QString m_pendingBgId;
   bool m_hasPendingRoles = false;
+  QLabel* m_statusLabel = nullptr;
 };
diff --git a/src/dvh/DvhComparePage.cpp b/src/dvh/DvhComparePage.cpp
new file mode 100644
index 0000000..e905d2d
--- /dev/null
+++ b/src/dvh/DvhComparePage.cpp
@@ -0,0 +1,560 @@
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#include "DvhComparePage.h"
+#include "DvhPlotWidget.h"
+#include "dcmIO.h"
+
+#include <QLineEdit>
+#include <QListWidget>
+#include <QTableWidget>
+#include <QTextEdit>
+#include <QProgressBar>
+#include <QCheckBox>
+#include <QPushButton>
+#include <QLabel>
+#include <QHBoxLayout>
+#include <QVBoxLayout>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QHeaderView>
+#include <QAbstractItemView>
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QSettings>
+#include <QFileInfo>
+#include <QDir>
+#include <QCoreApplication>
+#include <QLibrary>
+#include <QColor>
+#include <QPair>
+#include <QFont>
+
+#include <cmath>
+#include <cstring>
+
+namespace {
+
+struct Rgb {
+  int r, g, b;
+};
+
+static QVector<Rgb> dvhPalette()
+{
+  return {
+    {255, 0, 255}, {227, 23, 13}, {128, 42, 42}, {255, 128, 0},
+    {255, 153, 18}, {127, 255, 0}, {34, 139, 34}, {64, 224, 205},
+    {3, 168, 158}, {0, 0, 255}, {218, 112, 214}, {138, 43, 226}
+  };
+}
+
+static Qt::PenStyle dosePenStyle(int gid)
+{
+  static const Qt::PenStyle styles[] = {
+    Qt::SolidLine, Qt::DashLine, Qt::DotLine, Qt::DashDotLine, Qt::DashDotDotLine
+  };
+  return styles[gid % 5];
+}
+
+static bool isMetaPath(const QString& path)
+{
+  const QString l = path.toLower();
+  return l.endsWith(QStringLiteral(".mhd")) || l.endsWith(QStringLiteral(".mha"))
+      || l.endsWith(QStringLiteral(".nii")) || l.endsWith(QStringLiteral(".nii.gz"));
+}
+
+static bool isDcmPath(const QString& path)
+{
+  const QString l = path.toLower();
+  return l.endsWith(QStringLiteral(".dcm")) || l.endsWith(QStringLiteral(".dicom"));
+}
+
+} // namespace
+
+DvhComparePage::DvhComparePage(QWidget* parent)
+  : QWidget(parent)
+{
+  buildUi();
+}
+
+DvhComparePage::~DvhComparePage()
+{
+  freeResults();
+}
+
+void DvhComparePage::buildUi()
+{
+  // Original dvhViewer layout:
+  //   [ ROI LISTS | DVH RESULTS | PATHS / CONTROL / OUTPUT ]
+  auto* root = new QHBoxLayout(this);
+  root->setContentsMargins(8, 8, 8, 8);
+  root->setSpacing(8);
+
+  // ---- Left: ROI LISTS ----
+  auto* roiBox = new QGroupBox(tr("ROI LISTS"), this);
+  auto* roiLay = new QGridLayout(roiBox);
+  auto* allBtn = new QPushButton(tr("ALL"), this);
+  auto* noneBtn = new QPushButton(tr("CLC"), this);
+  auto* refreshBtn = new QPushButton(tr("DSP"), this);
+  connect(allBtn, &QPushButton::clicked, this, &DvhComparePage::onSelectAllRoi);
+  connect(noneBtn, &QPushButton::clicked, this, &DvhComparePage::onClearAllRoi);
+  connect(refreshBtn, &QPushButton::clicked, this, &DvhComparePage::onRoiVisibilityChanged);
+  roiLay->addWidget(allBtn, 0, 0);
+  roiLay->addWidget(noneBtn, 0, 1);
+  roiLay->addWidget(refreshBtn, 0, 2);
+  m_roiList = new QListWidget(this);
+  roiLay->addWidget(m_roiList, 1, 0, 5, 3);
+  root->addWidget(roiBox, 1);
+
+  // ---- Center: DVH RESULTS ----
+  auto* plotBox = new QGroupBox(tr("DVH RESULTs"), this);
+  auto* plotLay = new QVBoxLayout(plotBox);
+  plotLay->setContentsMargins(4, 8, 4, 4);
+  m_plot = new DvhPlotWidget(this);
+  plotLay->addWidget(m_plot, 1);
+  root->addWidget(plotBox, 7);
+
+  // ---- Right: PATHS + CONTROL + OUTPUT (~20% narrower than before) ----
+  auto* right = new QVBoxLayout();
+  root->addLayout(right, 3);
+
+  auto* pathBox = new QGroupBox(tr("PATHS"), this);
+  auto* pathLay = new QGridLayout(pathBox);
+
+  auto* imgLab = new QLabel(tr("Image  :"), this);
+  imgLab->setFixedWidth(70);
+  m_imgEdit = new QLineEdit(this);
+  m_imgEdit->setPlaceholderText(tr("CT/参考图像：文件夹、.mhd、.nii"));
+  auto* imgBtn = new QPushButton(tr("..."), this);
+  imgBtn->setFixedSize(24, 24);
+  connect(imgBtn, &QPushButton::clicked, this, &DvhComparePage::onBrowseImage);
+  pathLay->addWidget(imgLab, 0, 0);
+  pathLay->addWidget(m_imgEdit, 0, 1, 1, 10);
+  pathLay->addWidget(imgBtn, 0, 11);
+
+  auto* rtsLab = new QLabel(tr("Struc  :"), this);
+  rtsLab->setFixedWidth(70);
+  m_rtsEdit = new QLineEdit(this);
+  m_rtsEdit->setPlaceholderText(tr("RTSTRUCT .dcm"));
+  auto* rtsBtn = new QPushButton(tr("..."), this);
+  rtsBtn->setFixedSize(24, 24);
+  connect(rtsBtn, &QPushButton::clicked, this, &DvhComparePage::onBrowseRts);
+  pathLay->addWidget(rtsLab, 1, 0);
+  pathLay->addWidget(m_rtsEdit, 1, 1, 1, 10);
+  pathLay->addWidget(rtsBtn, 1, 11);
+
+  auto* addDose = new QPushButton(tr("+"), this);
+  auto* rmDose = new QPushButton(tr("-"), this);
+  addDose->setFixedWidth(36);
+  rmDose->setFixedWidth(36);
+  connect(addDose, &QPushButton::clicked, this, &DvhComparePage::onAddDose);
+  connect(rmDose, &QPushButton::clicked, this, &DvhComparePage::onRemoveDose);
+  pathLay->addWidget(addDose, 2, 9);
+  pathLay->addWidget(rmDose, 2, 10);
+
+  m_doseTable = new QTableWidget(0, 2, this);
+  m_doseTable->setHorizontalHeaderLabels({tr("Name"), tr("Dose Path")});
+  m_doseTable->horizontalHeader()->setStretchLastSection(true);
+  m_doseTable->verticalHeader()->setVisible(false);
+  m_doseTable->setSelectionBehavior(QAbstractItemView::SelectRows);
+  m_doseTable->setSelectionMode(QAbstractItemView::SingleSelection);
+  m_doseTable->setShowGrid(false);
+  pathLay->addWidget(m_doseTable, 3, 0, 8, 12);
+  right->addWidget(pathBox, 5);
+
+  auto* ctrlBox = new QGroupBox(tr("CONTROL"), this);
+  auto* ctrlLay = new QHBoxLayout(ctrlBox);
+  m_progress = new QProgressBar(this);
+  m_progress->setRange(0, 10);
+  m_progress->setValue(0);
+  m_calcBtn = new QPushButton(tr("CALCULATE"), this);
+  m_calcBtn->setMinimumWidth(100);
+  connect(m_calcBtn, &QPushButton::clicked, this, &DvhComparePage::onCalculate);
+  ctrlLay->addWidget(m_progress, 8);
+  ctrlLay->addWidget(m_calcBtn, 1);
+  right->addWidget(ctrlBox, 1);
+
+  auto* logBox = new QGroupBox(tr("OUT PUT INFO."), this);
+  auto* logLay = new QVBoxLayout(logBox);
+  m_log = new QTextEdit(this);
+  m_log->setReadOnly(true);
+  m_log->setFont(QFont(QStringLiteral("Consolas"), 9));
+  logLay->addWidget(m_log);
+  right->addWidget(logBox, 4);
+}
+
+QString DvhComparePage::defaultOpenDir() const
+{
+  QSettings settings(QStringLiteral("Manteia"), QStringLiteral("DoseCompare"));
+  const QString last = settings.value(QStringLiteral("dvhLastOpenDir")).toString();
+  if (!last.isEmpty() && QDir(last).exists())
+    return last;
+  return QCoreApplication::applicationDirPath();
+}
+
+void DvhComparePage::rememberOpenPath(const QString& path)
+{
+  const QString dir = QFileInfo(path).absolutePath();
+  if (dir.isEmpty())
+    return;
+  QSettings settings(QStringLiteral("Manteia"), QStringLiteral("DoseCompare"));
+  settings.setValue(QStringLiteral("dvhLastOpenDir"), dir);
+}
+
+QString DvhComparePage::resolveAlgoDllPath() const
+{
+  const QString base = QCoreApplication::applicationDirPath() + QStringLiteral("/algo/");
+#ifdef _DEBUG
+  const QString name = QStringLiteral("calcDVHLibraryD.dll");
+#else
+  const QString name = QStringLiteral("calcDVHLibrary.dll");
+#endif
+  return base + name;
+}
+
+void DvhComparePage::appendLog(const QString& msg)
+{
+  m_log->append(msg);
+}
+
+void DvhComparePage::onBrowseImage()
+{
+  const QString path = QFileDialog::getExistingDirectory(
+    this, tr("选择图像目录（DICOM 序列）"), defaultOpenDir());
+  if (!path.isEmpty()) {
+    m_imgEdit->setText(QDir::toNativeSeparators(path));
+    rememberOpenPath(path);
+    return;
+  }
+  const QString file = QFileDialog::getOpenFileName(
+    this, tr("选择图像文件"), defaultOpenDir(),
+    tr("Image (*.mhd *.mha *.nii *.nii.gz);;All (*.*)"));
+  if (file.isEmpty())
+    return;
+  m_imgEdit->setText(QDir::toNativeSeparators(file));
+  rememberOpenPath(file);
+}
+
+void DvhComparePage::onBrowseRts()
+{
+  const QString file = QFileDialog::getOpenFileName(
+    this, tr("选择 RT Structure"), defaultOpenDir(),
+    tr("DICOM (*.dcm);;All (*.*)"));
+  if (file.isEmpty())
+    return;
+  m_rtsEdit->setText(QDir::toNativeSeparators(file));
+  rememberOpenPath(file);
+}
+
+void DvhComparePage::onAddDose()
+{
+  if (m_doseTable->rowCount() >= 5) {
+    QMessageBox::information(this, tr("提示"), tr("最多支持 5 个剂量计划。"));
+    return;
+  }
+  const QString file = QFileDialog::getOpenFileName(
+    this, tr("选择剂量文件"), defaultOpenDir(),
+    tr("Dose (*.dcm *.mhd *.mha *.nii *.nii.gz);;All (*.*)"));
+  if (file.isEmpty())
+    return;
+  rememberOpenPath(file);
+  const int row = m_doseTable->rowCount();
+  m_doseTable->insertRow(row);
+  m_doseTable->setItem(row, 0, new QTableWidgetItem(QStringLiteral("Plan%1").arg(row + 1)));
+  m_doseTable->setItem(row, 1, new QTableWidgetItem(QDir::toNativeSeparators(file)));
+}
+
+void DvhComparePage::onRemoveDose()
+{
+  const auto rows = m_doseTable->selectionModel()->selectedRows();
+  for (int i = rows.size() - 1; i >= 0; --i)
+    m_doseTable->removeRow(rows[i].row());
+}
+
+void DvhComparePage::freeResults()
+{
+  if (!m_strucSet) {
+    m_doseNum = 0;
+    return;
+  }
+  for (int gid = 0; gid < m_doseNum; ++gid) {
+    if (!m_strucSet[gid].struc)
+      continue;
+    for (int sid = 0; sid < m_strucSet[gid].strucNum; ++sid) {
+      Struc* s = m_strucSet[gid].struc + sid;
+      if (s->h_innDat) {
+        free(s->h_innDat);
+        s->h_innDat = nullptr;
+      }
+    }
+    delete[] m_strucSet[gid].struc;
+    m_strucSet[gid].struc = nullptr;
+  }
+  delete[] m_strucSet;
+  m_strucSet = nullptr;
+  m_doseNum = 0;
+  m_keptDoses.clear();
+  m_keptMasks.clear();
+}
+
+void DvhComparePage::onCalculate()
+{
+  m_log->clear();
+  m_plot->setCurves({});
+  freeResults();
+  m_progress->setValue(0);
+
+  const QString imgPath = m_imgEdit->text().trimmed();
+  const QString rtsPath = m_rtsEdit->text().trimmed();
+  if (imgPath.isEmpty() || rtsPath.isEmpty()) {
+    QMessageBox::warning(this, tr("警告"), tr("请先指定图像与 RT Structure 路径。"));
+    return;
+  }
+
+  QVector<QPair<QString, QString>> doses;
+  for (int r = 0; r < m_doseTable->rowCount(); ++r) {
+    const QString tag = m_doseTable->item(r, 0) ? m_doseTable->item(r, 0)->text().trimmed() : QString();
+    const QString path = m_doseTable->item(r, 1) ? m_doseTable->item(r, 1)->text().trimmed() : QString();
+    if (path.isEmpty())
+      continue;
+    doses.push_back({tag.isEmpty() ? QStringLiteral("Plan%1").arg(r + 1) : tag, path});
+  }
+  if (doses.isEmpty()) {
+    QMessageBox::warning(this, tr("警告"), tr("请至少添加一个剂量文件路径。"));
+    return;
+  }
+  if (doses.size() > 5) {
+    QMessageBox::warning(this, tr("警告"), tr("剂量计划数量不能超过 5。"));
+    return;
+  }
+
+  // Let user pick dose file if path cell empty was skipped; also allow browse via double-click later.
+  // If path looks incomplete, try open dialog for empty ones already skipped.
+
+  const QString dllPath = resolveAlgoDllPath();
+  QLibrary lib(dllPath);
+  if (!lib.load()) {
+    QMessageBox::warning(this, tr("警告"),
+                         tr("无法加载 DVH 算法库：\n%1\n%2").arg(dllPath, lib.errorString()));
+    m_progress->setValue(10);
+    return;
+  }
+
+  typedef int (*DvhAlgoFunc)(const float* ofs, const float* spc, const int* scz,
+                             const float* dose, StrucSet& sSet);
+  auto* dvhAlgoFunc = reinterpret_cast<DvhAlgoFunc>(lib.resolve("calcStrucDVH"));
+  if (!dvhAlgoFunc) {
+    QMessageBox::warning(this, tr("警告"), tr("DLL 中找不到 calcStrucDVH。"));
+    lib.unload();
+    return;
+  }
+
+  appendLog(tr("已加载 DLL。"));
+  m_progress->setValue(1);
+
+  int ret = 0;
+  itk::Image<float, 3>::Pointer img;
+  const std::string imgStd = imgPath.toLocal8Bit().constData();
+  if (isMetaPath(imgPath))
+    ret = itkMetaDataReader(imgStd, img);
+  else
+    ret = itkDicomSeriesReader(imgStd, img);
+
+  if (ret < 0 || !img) {
+    appendLog(tr("加载图像失败: %1").arg(ret));
+    QMessageBox::warning(this, tr("错误"), tr("加载图像失败。"));
+    lib.unload();
+    return;
+  }
+  appendLog(tr("图像加载成功。"));
+  m_progress->setValue(3);
+
+  std::vector<itk::Image<float, 3>::Pointer> doseGroup;
+  for (const auto& d : doses) {
+    itk::Image<float, 3>::Pointer dose;
+    const std::string p = d.second.toLocal8Bit().constData();
+    if (isMetaPath(d.second))
+      ret = itkMetaDataReader(p, dose);
+    else if (isDcmPath(d.second))
+      ret = itkDcmDoseReader(p, dose);
+    else
+      ret = -1;
+    if (ret < 0 || !dose) {
+      appendLog(tr("加载剂量失败: %1").arg(d.second));
+      QMessageBox::warning(this, tr("错误"), tr("加载剂量失败：%1").arg(d.second));
+      lib.unload();
+      return;
+    }
+    doseGroup.push_back(dose);
+  }
+  m_keptDoses = doseGroup;
+  appendLog(tr("剂量加载成功（%1）。").arg(doseGroup.size()));
+  m_progress->setValue(5);
+
+  std::vector<std::string> nameVec;
+  std::vector<itk::Image<unsigned char, 3>::Pointer> maskVec;
+  ret = itkRtStructureReader(rtsPath.toLocal8Bit().constData(), img, nameVec, maskVec);
+  if (ret < 0 || maskVec.empty()) {
+    appendLog(tr("加载 RT Structure 失败: %1").arg(ret));
+    QMessageBox::warning(this, tr("错误"), tr("加载 RT Structure 失败。"));
+    lib.unload();
+    return;
+  }
+  m_keptMasks = maskVec;
+  appendLog(tr("结构加载成功（%1 个 ROI）。").arg(static_cast<int>(maskVec.size())));
+  m_progress->setValue(7);
+  appendLog(tr("正在计算 DVH…"));
+
+  const int doseGroupSz = static_cast<int>(doseGroup.size());
+  m_doseNum = doseGroupSz;
+  m_strucSet = new StrucSet[doseGroupSz];
+  std::memset(m_strucSet, 0, sizeof(StrucSet) * doseGroupSz);
+
+  for (int gid = 0; gid < doseGroupSz; ++gid) {
+    m_strucSet[gid].tagName = doses[gid].first.toStdString();
+    m_strucSet[gid].strucNum = static_cast<int>(maskVec.size());
+    m_strucSet[gid].struc = new Struc[m_strucSet[gid].strucNum];
+    std::memset(m_strucSet[gid].struc, 0, sizeof(Struc) * m_strucSet[gid].strucNum);
+
+    for (int sid = 0; sid < static_cast<int>(maskVec.size()); ++sid) {
+      Struc* struc = m_strucSet[gid].struc + sid;
+      struc->strucName = nameVec[sid];
+      struc->h_dat = maskVec[sid]->GetBufferPointer();
+      for (int i = 0; i < 3; ++i) {
+        struc->origin[i] = static_cast<float>(maskVec[sid]->GetOrigin()[i]);
+        struc->spacing[i] = static_cast<float>(maskVec[sid]->GetSpacing()[i]);
+        struc->size[i] = static_cast<int>(maskVec[sid]->GetLargestPossibleRegion().GetSize()[i]);
+      }
+      struc->datSz = struc->size[0] * struc->size[1] * struc->size[2];
+    }
+
+    float dsOrigin[3], dsSpacing[3];
+    int dsSize[3];
+    for (int i = 0; i < 3; ++i) {
+      dsOrigin[i] = static_cast<float>(doseGroup[gid]->GetOrigin()[i]);
+      dsSpacing[i] = static_cast<float>(doseGroup[gid]->GetSpacing()[i]);
+      dsSize[i] = static_cast<int>(doseGroup[gid]->GetLargestPossibleRegion().GetSize()[i]);
+    }
+    float* dosePtr = doseGroup[gid]->GetBufferPointer();
+    dvhAlgoFunc(dsOrigin, dsSpacing, dsSize, dosePtr, m_strucSet[gid]);
+
+    appendLog(QStringLiteral(".................... %1 ....................").arg(doses[gid].first));
+    for (int i = 0; i < m_strucSet[gid].strucNum; ++i) {
+      const int datSz = m_strucSet[gid].struc[i].innSz;
+      if (datSz <= 0 || !m_strucSet[gid].struc[i].h_innDat)
+        continue;
+      double sum = 0;
+      for (int k = 0; k < datSz; ++k)
+        sum += m_strucSet[gid].struc[i].h_innDat[k];
+      sum /= datSz;
+      const QString name = QString::fromStdString(m_strucSet[gid].struc[i].strucName);
+      appendLog(tr("%1 / %2  min=%3  max=%4  ave=%5")
+                  .arg(doses[gid].first, name)
+                  .arg(m_strucSet[gid].struc[i].h_innDat[0], 0, 'f', 3)
+                  .arg(m_strucSet[gid].struc[i].h_innDat[datSz - 1], 0, 'f', 3)
+                  .arg(sum, 0, 'f', 3));
+    }
+  }
+
+  m_progress->setValue(10);
+  appendLog(tr("DVH 计算完成。"));
+  lib.unload();
+
+  rebuildRoiList();
+  refreshPlot();
+}
+
+void DvhComparePage::rebuildRoiList()
+{
+  m_roiList->clear();
+  m_roiChecks.clear();
+  if (!m_strucSet || m_doseNum <= 0)
+    return;
+
+  for (int i = 0; i < m_strucSet[0].strucNum; ++i) {
+    auto* item = new QListWidgetItem(m_roiList);
+    auto* check = new QCheckBox(QString::fromStdString(m_strucSet[0].struc[i].strucName), m_roiList);
+    check->setChecked(true);
+    m_roiList->addItem(item);
+    m_roiList->setItemWidget(item, check);
+    m_roiChecks.push_back(check);
+    connect(check, &QCheckBox::toggled, this, &DvhComparePage::onRoiVisibilityChanged);
+  }
+}
+
+void DvhComparePage::onSelectAllRoi()
+{
+  for (QCheckBox* c : m_roiChecks)
+    c->setChecked(true);
+}
+
+void DvhComparePage::onClearAllRoi()
+{
+  for (QCheckBox* c : m_roiChecks)
+    c->setChecked(false);
+}
+
+void DvhComparePage::onRoiVisibilityChanged()
+{
+  refreshPlot();
+}
+
+void DvhComparePage::refreshPlot()
+{
+  QVector<DvhCurve> curves;
+  if (!m_strucSet || m_doseNum <= 0) {
+    m_plot->setCurves(curves);
+    return;
+  }
+
+  const auto palette = dvhPalette();
+  float maxDose = 0.f;
+  QVector<float> sampleBuf(DVH_MAX_SPN);
+
+  for (int gid = 0; gid < m_doseNum; ++gid) {
+    for (int i = 0; i < m_strucSet[gid].strucNum; ++i) {
+      if (i < m_roiChecks.size() && !m_roiChecks[i]->isChecked())
+        continue;
+      Struc* struc = m_strucSet[gid].struc + i;
+      if (!struc->h_innDat || struc->innSz <= 0)
+        continue;
+
+      int dvhSz = struc->innSz;
+      float* dvhDat = struc->h_innDat;
+      if (dvhSz > DVH_MAX_SPN) {
+        sampleBuf[0] = dvhDat[0];
+        sampleBuf[DVH_MAX_SPN - 1] = dvhDat[dvhSz - 1];
+        const float span = (struc->innSz - 1) * 1.f / (DVH_MAX_SPN - 1);
+        for (int k = 1; k < DVH_MAX_SPN - 1; ++k) {
+          const float p = k * span;
+          const int id0 = static_cast<int>(std::floor(p));
+          const int id1 = id0 + 1;
+          const float w0 = id1 - p;
+          const float w1 = p - id0;
+          sampleBuf[k] = w0 * dvhDat[id0] + w1 * dvhDat[id1];
+        }
+        dvhDat = sampleBuf.data();
+        dvhSz = DVH_MAX_SPN;
+      }
+
+      DvhCurve curve;
+      curve.name = QStringLiteral("%1 (%2)")
+                     .arg(QString::fromStdString(struc->strucName))
+                     .arg(QString::fromStdString(m_strucSet[gid].tagName));
+      const Rgb rgb = palette[i % palette.size()];
+      curve.color = QColor(rgb.r, rgb.g, rgb.b);
+      curve.style = dosePenStyle(gid);
+      curve.points.reserve(dvhSz + 1);
+      curve.points.push_back(QPointF(0.0, 1.0));
+      for (int j = 0; j < dvhSz; ++j) {
+        curve.points.push_back(QPointF(dvhDat[j], 1.0 - (j + 1) / (1.0 * dvhSz)));
+        if (dvhDat[j] > maxDose)
+          maxDose = dvhDat[j];
+      }
+      curves.push_back(curve);
+    }
+  }
+
+  m_plot->setXMax(maxDose > 0 ? maxDose * 1.2 : 1.0);
+  m_plot->setCurves(curves);
+}
diff --git a/src/dvh/DvhComparePage.h b/src/dvh/DvhComparePage.h
new file mode 100644
index 0000000..7acb2e3
--- /dev/null
+++ b/src/dvh/DvhComparePage.h
@@ -0,0 +1,63 @@
+#pragma once
+
+#include "dvhTypes.h"
+#include "itkStlCompat.h"
+
+#include <QWidget>
+#include <QString>
+#include <QVector>
+#include <vector>
+
+#include <itkImage.h>
+
+class QLineEdit;
+class QListWidget;
+class QTableWidget;
+class QTextEdit;
+class QProgressBar;
+class QCheckBox;
+class QPushButton;
+class DvhPlotWidget;
+
+class DvhComparePage : public QWidget {
+  Q_OBJECT
+public:
+  explicit DvhComparePage(QWidget* parent = nullptr);
+  ~DvhComparePage() override;
+
+private slots:
+  void onBrowseImage();
+  void onBrowseRts();
+  void onAddDose();
+  void onRemoveDose();
+  void onCalculate();
+  void onSelectAllRoi();
+  void onClearAllRoi();
+  void onRoiVisibilityChanged();
+
+private:
+  void buildUi();
+  void freeResults();
+  void rebuildRoiList();
+  void refreshPlot();
+  QString defaultOpenDir() const;
+  void rememberOpenPath(const QString& path);
+  QString resolveAlgoDllPath() const;
+  void appendLog(const QString& msg);
+
+  QLineEdit* m_imgEdit = nullptr;
+  QLineEdit* m_rtsEdit = nullptr;
+  QTableWidget* m_doseTable = nullptr;
+  QListWidget* m_roiList = nullptr;
+  QTextEdit* m_log = nullptr;
+  QProgressBar* m_progress = nullptr;
+  DvhPlotWidget* m_plot = nullptr;
+  QPushButton* m_calcBtn = nullptr;
+
+  QVector<QCheckBox*> m_roiChecks;
+
+  int m_doseNum = 0;
+  StrucSet* m_strucSet = nullptr;
+  std::vector<itk::Image<float, 3>::Pointer> m_keptDoses;
+  std::vector<itk::Image<unsigned char, 3>::Pointer> m_keptMasks;
+};
diff --git a/src/dvh/DvhPlotWidget.cpp b/src/dvh/DvhPlotWidget.cpp
new file mode 100644
index 0000000..9e1f6ba
--- /dev/null
+++ b/src/dvh/DvhPlotWidget.cpp
@@ -0,0 +1,106 @@
+#include "DvhPlotWidget.h"
+
+#include <QPainter>
+#include <QPainterPath>
+#include <QPaintEvent>
+#include <QPalette>
+#include <algorithm>
+#include <cmath>
+
+DvhPlotWidget::DvhPlotWidget(QWidget* parent)
+  : QWidget(parent)
+{
+  setMinimumSize(400, 300);
+  setAutoFillBackground(true);
+}
+
+void DvhPlotWidget::setCurves(const QVector<DvhCurve>& curves)
+{
+  m_curves = curves;
+  update();
+}
+
+void DvhPlotWidget::setXMax(double xMax)
+{
+  m_xMax = std::max(1e-3, xMax);
+  update();
+}
+
+void DvhPlotWidget::paintEvent(QPaintEvent*)
+{
+  QPainter p(this);
+  p.setRenderHint(QPainter::Antialiasing, true);
+
+  const QColor bg = palette().color(QPalette::Window);
+  const QColor base = palette().color(QPalette::Base);
+  const QColor text = palette().color(QPalette::WindowText);
+  const QColor mid = palette().color(QPalette::Mid);
+  p.fillRect(rect(), bg);
+
+  const QRectF plot = rect().adjusted(56, 28, -18, -42);
+  p.setPen(QPen(mid, 1));
+  p.setBrush(base);
+  p.drawRect(plot);
+
+  p.setPen(QPen(mid, 1, Qt::DotLine));
+  for (int i = 1; i < 5; ++i) {
+    const double y = plot.top() + plot.height() * i / 5.0;
+    p.drawLine(QPointF(plot.left(), y), QPointF(plot.right(), y));
+  }
+  for (int i = 1; i < 5; ++i) {
+    const double x = plot.left() + plot.width() * i / 5.0;
+    p.drawLine(QPointF(x, plot.top()), QPointF(x, plot.bottom()));
+  }
+
+  auto mapX = [&](double x) {
+    return plot.left() + (x / m_xMax) * plot.width();
+  };
+  auto mapY = [&](double y) {
+    return plot.bottom() - y * plot.height();
+  };
+
+  for (const DvhCurve& c : m_curves) {
+    if (!c.visible || c.points.size() < 2)
+      continue;
+    QPen pen(c.color, 2.0);
+    pen.setStyle(c.style);
+    p.setPen(pen);
+    QPainterPath path;
+    path.moveTo(mapX(c.points[0].x()), mapY(c.points[0].y()));
+    for (int i = 1; i < c.points.size(); ++i)
+      path.lineTo(mapX(c.points[i].x()), mapY(c.points[i].y()));
+    p.drawPath(path);
+  }
+
+  p.setPen(text);
+  QFont f = font();
+  f.setPointSize(9);
+  p.setFont(f);
+  p.drawText(QRectF(plot.left(), plot.bottom() + 6, plot.width(), 20),
+             Qt::AlignCenter, tr("Dose"));
+  p.save();
+  p.translate(14, plot.center().y());
+  p.rotate(-90);
+  p.drawText(QRectF(-60, -10, 120, 20), Qt::AlignCenter, tr("Volume"));
+  p.restore();
+
+  p.drawText(QPointF(plot.left(), plot.bottom() + 20), QStringLiteral("0"));
+  p.drawText(QPointF(plot.right() - 40, plot.bottom() + 20),
+             QString::number(m_xMax, 'f', 1));
+  p.drawText(QPointF(8, plot.top() + 12), QStringLiteral("1"));
+  p.drawText(QPointF(8, plot.bottom()), QStringLiteral("0"));
+
+  double lx = plot.left() + 8;
+  double ly = plot.top() + 10;
+  for (const DvhCurve& c : m_curves) {
+    if (!c.visible)
+      continue;
+    p.setPen(QPen(c.color, 2));
+    p.drawLine(QPointF(lx, ly), QPointF(lx + 18, ly));
+    p.setPen(text);
+    p.drawText(QPointF(lx + 24, ly + 4), c.name);
+    ly += 16;
+    if (ly > plot.top() + 120)
+      break;
+  }
+}
diff --git a/src/dvh/DvhPlotWidget.h b/src/dvh/DvhPlotWidget.h
new file mode 100644
index 0000000..0114766
--- /dev/null
+++ b/src/dvh/DvhPlotWidget.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <QWidget>
+#include <QVector>
+#include <QColor>
+#include <QString>
+
+struct DvhCurve {
+  QString name;
+  QColor color;
+  Qt::PenStyle style = Qt::SolidLine;
+  QVector<QPointF> points; // x=dose, y=volume fraction [0,1]
+  bool visible = true;
+};
+
+class DvhPlotWidget : public QWidget {
+  Q_OBJECT
+public:
+  explicit DvhPlotWidget(QWidget* parent = nullptr);
+
+  void setCurves(const QVector<DvhCurve>& curves);
+  void setXMax(double xMax);
+
+protected:
+  void paintEvent(QPaintEvent* event) override;
+
+private:
+  QVector<DvhCurve> m_curves;
+  double m_xMax = 1.0;
+};
diff --git a/src/dvh/dcmIO.cpp b/src/dvh/dcmIO.cpp
new file mode 100644
index 0000000..fc146d6
--- /dev/null
+++ b/src/dvh/dcmIO.cpp
@@ -0,0 +1,529 @@
+#include "dcmIO.h"
+#include <fstream>
+#include <iostream>
+
+//.........................................................................
+// Get a itk 3-dim float IMAGE from a given META data file
+//.........................................................................
+int itkMetaDataReader(
+    const std::string metaDataFile,
+    itk::Image<float, 3>::Pointer& image)
+{
+    itk::GDCMImageIOFactory::RegisterOneFactory();
+    typedef itk::ImageFileReader<itk::Image<float, 3>> ReaderType;
+    ReaderType::Pointer reader = ReaderType::New();
+    reader->SetFileName(metaDataFile);
+
+    try
+    {
+        reader->Update();
+        image = reader->GetOutput();
+    }
+    catch (itk::ExceptionObject& err)
+    {
+        std::cout << "Error: " << err.GetDescription() << " in itkImageLocationFunction" << std::endl;;
+        return ERR_ER_LOAD_IMGE;
+    }
+
+    return 0;
+}
+
+//.........................................................................
+// Get a itk 3-dim float IMAGE from a given META data file
+//.........................................................................
+int itkMetaMaskReader(
+    const std::string maskDataFile,
+    itk::Image<unsigned char, 3>::Pointer& mask)
+{
+    itk::GDCMImageIOFactory::RegisterOneFactory();
+    typedef itk::ImageFileReader<itk::Image<unsigned char, 3>> ReaderType;
+    ReaderType::Pointer reader = ReaderType::New();
+    reader->SetFileName(maskDataFile);
+
+    try
+    {
+        reader->Update();
+        mask = reader->GetOutput();
+    }
+    catch (itk::ExceptionObject& err)
+    {
+        std::cout << "Error: " << err.GetDescription() << " in itkImageLocationFunction" << std::endl;;
+        return ERR_ER_LOAD_IMGE;
+    }
+
+    return 0;
+}
+
+//.........................................................................
+// Get a itk 3-dim float dose from a given DCM data file
+//.........................................................................
+int itkDcmDoseReader(
+    const std::string dcmDoseFile,
+    itk::Image<float, 3>::Pointer& dose)
+{
+    itk::GDCMImageIOFactory::RegisterOneFactory();
+    typedef itk::ImageFileReader<itk::Image<float, 3>> ReaderType;
+    ReaderType::Pointer reader = ReaderType::New();
+    reader->SetFileName(dcmDoseFile);
+
+    try
+    {
+        reader->Update();
+        dose = reader->GetOutput();
+    }
+    catch (itk::ExceptionObject& err)
+    {
+        std::cout << "Error: " << err.GetDescription() << " in itkImageLocationFunction" << std::endl;;
+        return ERR_ER_LOAD_DOSE;
+    }
+
+    // get the ratio by gdcm
+    itk::GDCMImageIOFactory::RegisterOneFactory();
+    gdcm::Reader RTreader;
+    RTreader.SetFileName(dcmDoseFile.c_str());
+
+    if (!RTreader.Read())
+    {
+        std::cout << "Problem reading file: " << dcmDoseFile << std::endl;
+        return ERR_ER_LOAD_DOSE;
+    }
+
+    // const gdcm::FileMetaInformation &h = RTreader.GetFile().GetHeader();
+    const gdcm::DataSet& ds = RTreader.GetFile().GetDataSet();
+    std::cout << "Parsing: " << dcmDoseFile << std::endl;
+    gdcm::MediaStorage ms;
+    ms.SetFromFile(RTreader.GetFile());
+    std::cout << "media storage: " << ms << std::endl;
+    gdcm::Tag tdoseScale(0x3004, 0x000e);
+
+    if (!ds.FindDataElement(tdoseScale))
+    {
+        std::cout << "Problem locating 0x3004, 0x000e - Is this a valid RT Plan file?" << std::endl;
+        return ERR_LOAD_DOSE_RT;
+    }
+
+    const gdcm::DataElement& doseScalede = ds.GetDataElement(tdoseScale);
+
+    // check the fraction beam number
+    if (doseScalede.IsEmpty())
+    {
+        std::cout << "Sorry! Plan do not contain dose grid scaling information!" << std::endl;
+        return ERR_LOAD_DOSE_RT;
+    }
+
+    gdcm::Attribute<0x3004, 0x000e> doseScaleat;
+    doseScaleat.SetFromDataElement(doseScalede);
+    float doseScale = doseScaleat.GetValues()[0];
+    // loop for each pixel
+    float* dosePtr = dose->GetBufferPointer();
+    itk::Image<float, 3>::SizeType sz = dose->GetLargestPossibleRegion().GetSize();
+    #pragma omp parallel for num_threads(15)
+
+    for (int i = 0; i < sz[0] * sz[1] * sz[2]; ++i)
+        dosePtr[i] *= doseScale;
+
+    return 0;
+}
+
+//.........................................................................
+// Get a itk 3-dim float IMAGE from a given DICOM series folder.
+//.........................................................................
+int itkDicomSeriesReader(
+    const std::string dicomFilesPath,
+    itk::Image<float, 3>::Pointer& image)
+{
+    //typedef
+    typedef itk::Image<float, 3> ImageType;
+    // initializing
+    image = ImageType::New();
+
+    // read DICOM files
+    if (DBG_DISP)
+        std::cout << "Begin read DICOM SERIES..................." << std::endl;
+
+    // typedef
+    typedef itk::ImageSeriesReader<ImageType> ReaderType;
+    ReaderType::Pointer reader = ReaderType::New();
+    typedef itk::GDCMImageIO ImageIOType;
+    ImageIOType::Pointer dicomIO = ImageIOType::New();
+    reader->SetImageIO(dicomIO);
+    typedef itk::GDCMSeriesFileNames NameGeneratorType;
+    NameGeneratorType::Pointer nameGenerator = NameGeneratorType::New();
+    nameGenerator->SetUseSeriesDetails(true);
+    //nameGenerator->AddSeriesRestriction(dicomChar); // restriction
+    nameGenerator->SetDirectory(dicomFilesPath);
+    typedef std::vector<std::string> seriesIdContainer;
+    const seriesIdContainer& seriesUID = nameGenerator->GetSeriesUIDs();
+
+    // check file number
+    if (seriesUID.size() < 1)
+    {
+        std::cout << "No Image in folder!" << std::endl;
+        return ERR_ER_LOAD_IMGE;
+    }
+
+    seriesIdContainer::const_iterator seriesItr = seriesUID.begin();
+    seriesIdContainer::const_iterator seriesEnd = seriesUID.end();
+
+    while (seriesItr != seriesEnd)
+    {
+        if (DBG_DISP)
+            std::cout << seriesItr->c_str() << std::endl;
+
+        ++seriesItr;
+    }
+
+    typedef std::vector<std::string> FilesNamesContainer;
+    FilesNamesContainer filesNames;
+    filesNames = nameGenerator->GetFileNames(seriesUID.begin()->c_str());
+    reader->SetFileNames(filesNames);
+
+    try
+    {
+        reader->Update();
+    }
+    catch (itk::ExceptionObject& ex)
+    {
+        std::cout << ex << std::endl;
+        return ERR_ER_LOAD_IMGE;
+    }
+
+    image = reader->GetOutput();
+
+    if (DBG_DISP)
+        std::cout << "End read DICOM SERIES....................." << std::endl;
+
+    return 0;
+}
+
+//.........................................................................
+// linear transform
+//.........................................................................
+static void linearTransform(
+    const double* rotMat,
+    const double* origin,
+    double* coord)
+{
+    // homo coordinates.
+    double coordHomo[3];
+
+    for (int i = 0; i < 3; ++i)
+        coordHomo[i] = coord[i] - origin[i];
+
+    // to new system
+    for (int i = 0; i < 3; ++i)
+    {
+        coord[i] = origin[i];
+
+        for (int j = 0; j < 3; ++j)
+            coord[i] += rotMat[i * 3 + j] * coordHomo[j];
+    }
+}
+
+//.........................................................................
+// Get a set of itk 3-dim unsigned short masks
+//.........................................................................
+int itkRtStructureReader(
+    std::string rtsFilePath,
+    itk::Image<float, 3>::Pointer image,
+    std::vector<std::string>& nameVec,
+    std::vector<itk::Image<unsigned char, 3>::Pointer>& maskVec)
+{
+    nameVec.clear();
+    maskVec.clear();
+    //typedef
+    typedef itk::Image<float, 3>         ImageType;
+    typedef itk::Image<unsigned char, 3> MaskType;
+    // information of image
+    ImageType::SpacingType spacing3d = image->GetSpacing();
+    ImageType::PointType origin3d = image->GetOrigin();
+    ImageType::RegionType region3d = image->GetLargestPossibleRegion();
+    ImageType::SizeType size3d = region3d.GetSize();
+    ImageType::IndexType index3d = region3d.GetIndex();
+    ImageType::DirectionType direction = image->GetDirection();
+    double rotMat[9] { 0 };
+    double rotMatInv[9] { 0 };
+    double rotBase[3] { 0 };
+
+    for (int i = 0; i < 3; ++i)
+    {
+        rotBase[i] = origin3d[i];
+
+        for (int j = 0; j < 3; ++j)
+        {
+            rotMat[i * 3 + j] = direction.GetVnlMatrix()[i][j];
+            rotMatInv[j * 3 + i] = rotMat[i * 3 + j];
+        }
+    }
+
+    // read rt file
+    int iPointsOutsideBoundary = 0;
+    itk::GDCMImageIOFactory::RegisterOneFactory();
+    gdcm::Reader RTreader;
+    RTreader.SetFileName(rtsFilePath.c_str());
+
+    if (!RTreader.Read())
+    {
+        std::cout << "Problem reading file: " << rtsFilePath << std::endl;
+        return ERR_LOAD_RTSTRUC;
+    }
+
+    // const gdcm::FileMetaInformation &h = RTreader.GetFile().GetHeader();
+    const gdcm::DataSet& ds = RTreader.GetFile().GetDataSet();
+    std::cout << "Parsing: " << rtsFilePath << std::endl;
+    gdcm::MediaStorage ms;
+    ms.SetFromFile(RTreader.GetFile());
+    std::cout << "media storage: " << ms << std::endl;
+    // (3006,0020) SQ (Sequence with explicit length #=4)     # 370, 1 StructureSetROISequence
+    gdcm::Tag tssroisq(0x3006, 0x0020);
+
+    if (!ds.FindDataElement(tssroisq))
+    {
+        std::cout << "Problem locating 0x3006,0x0020 - Is this a valid RT Structure file?" << std::endl;
+        return ERR_LOAD_RTSTRUC;
+    }
+
+    gdcm::Tag troicsq(0x3006, 0x0039);
+
+    if (!ds.FindDataElement(troicsq))
+    {
+        std::cout << "Problem locating 0x3006,0x0039 - Is this a valid RT Structure file?" << std::endl;
+        return ERR_LOAD_RTSTRUC;
+    }
+
+    const gdcm::DataElement& roicsq = ds.GetDataElement(troicsq);
+    gdcm::SmartPointer<gdcm::SequenceOfItems> sqi = roicsq.GetValueAsSQ();
+
+    if (!sqi || !sqi->GetNumberOfItems())
+    {
+        return ERR_LOAD_RTSTRUC;
+    }
+
+    const gdcm::DataElement& ssroisq = ds.GetDataElement(tssroisq);
+    gdcm::SmartPointer<gdcm::SequenceOfItems> ssqi = ssroisq.GetValueAsSQ();
+
+    if (!ssqi || !ssqi->GetNumberOfItems())
+    {
+        return ERR_LOAD_RTSTRUC;
+    }
+
+    std::cout << "Number of structures found:" << sqi->GetNumberOfItems() << std::endl;
+    //loop through structures
+    nameVec.reserve(sqi->GetNumberOfItems());
+    maskVec.reserve(sqi->GetNumberOfItems());
+
+    for (unsigned int pd = 0; pd < sqi->GetNumberOfItems(); ++pd)
+    {
+        // for vtkPoly contours
+        vtkSmartPointer<vtkPolyData> contours = vtkSmartPointer<vtkPolyData>::New();
+        const gdcm::Item& item = sqi->GetItem(pd + 1); // Item start at #1
+        gdcm::Attribute<0x3006, 0x0084> roinumber;
+        const gdcm::DataSet& nestedds = item.GetNestedDataSet();
+        roinumber.SetFromDataElement(nestedds.GetDataElement(roinumber.GetTag()));
+        // find structure_set_roi_sequence corresponding to roi_contour_sequence (by comparing id numbers)
+        unsigned int spd = 0;
+        gdcm::Item& sitem = ssqi->GetItem(spd + 1);
+        gdcm::DataSet& snestedds = sitem.GetNestedDataSet();
+        gdcm::Attribute<0x3006, 0x0022> sroinumber;
+
+        do
+        {
+            sitem = ssqi->GetItem(spd + 1);
+            snestedds = sitem.GetNestedDataSet();
+            sroinumber.SetFromDataElement(snestedds.GetDataElement(sroinumber.GetTag()));
+            spd++;
+        }
+        while (sroinumber.GetValue() != roinumber.GetValue());
+
+        gdcm::Tag stcsq(0x3006, 0x0026);
+
+        if (!snestedds.FindDataElement(stcsq))
+        {
+            std::cout << "Did not find sttsq data el " << stcsq << "   continuing..." << std::endl;
+            continue; //return 0;
+        }
+
+        const gdcm::DataElement& sde = snestedds.GetDataElement(stcsq);
+        //(3006,002a) IS [255\192\96]                             # 10,3 ROI Display Color
+        gdcm::Tag troidc(0x3006, 0x002a);
+        gdcm::Attribute<0x3006, 0x002a> color = {};
+
+        if (nestedds.FindDataElement(troidc))
+        {
+            const gdcm::DataElement& decolor = nestedds.GetDataElement(troidc);
+            color.SetFromDataElement(decolor);
+        }
+
+        //(3006,0040) SQ (Sequence with explicit length #=8)      # 4326, 1 ContourSequence
+        gdcm::Tag tcsq(0x3006, 0x0040);
+
+        if (!nestedds.FindDataElement(tcsq))
+        {
+            continue;
+        }
+
+        const gdcm::DataElement& csq = nestedds.GetDataElement(tcsq);
+        gdcm::SmartPointer<gdcm::SequenceOfItems> sqi2 = csq.GetValueAsSQ();
+
+        if (!sqi2 || !sqi2->GetNumberOfItems())
+        {
+            std::cout << "csq: " << csq << std::endl;
+            std::cout << "sqi2: " << *sqi2 << std::endl;
+            std::cout << "Did not find sqi2 or no. items == 0   " << sqi2->GetNumberOfItems() << "   continuing..." << std::endl;
+            continue;
+        }
+
+        unsigned int nitems = sqi2->GetNumberOfItems();
+        std::cout << "Structure " << pd << ". Number of regions: " << nitems << std::endl;
+        std::string str_currentOrgan(sde.GetByteValue()->GetPointer(), sde.GetByteValue()->GetLength());
+        /*!trim to remove spaces in organ name which can cause problems in scripts eg. "CBCT01__BULK  BONE .nii" .
+           Might need to have this as parameter? */
+        std::cout << pd << ". Structure name: " << str_currentOrgan << std::endl;
+        //now loop through each item for this structure (eg one prostate region on a single slice is an item)
+        vtkSmartPointer<vtkCellArray> cell = vtkSmartPointer<vtkCellArray>::New();
+        vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
+        int pointId = 0;
+
+        for (unsigned int i = 0; i < nitems; ++i)
+        {
+            vtkSmartPointer<vtkPolyLine> polyLine = vtkSmartPointer<vtkPolyLine>::New();
+            const gdcm::Item& item2 = sqi2->GetItem(i + 1); // Item start at #1
+            const gdcm::DataSet& nestedds2 = item2.GetNestedDataSet();
+            // (3006,0050) DS [43.57636\65.52504\-10.0\46.043102\62.564945\-10.0\49.126537\60.714... # 398,48 ContourData
+            gdcm::Tag tcontourdata(0x3006, 0x0050);
+            const gdcm::DataElement& contourdata = nestedds2.GetDataElement(tcontourdata);
+            //const gdcm::ByteValue *bv = contourdata.GetByteValue();
+            gdcm::Attribute<0x3006, 0x0050> at;
+            at.SetFromDataElement(contourdata);
+            const double* pts = at.GetValues();
+            unsigned int npts = at.GetNumberOfValues() / 3;
+
+            for (unsigned int j = 0; j < npts * 3; j += 3)
+            {
+                double point[3];
+                point[0] = pts[j + 0];
+                point[1] = pts[j + 1];
+                point[2] = pts[j + 2];
+                // add by HSS for direction
+                linearTransform(rotMat, rotBase, point);
+                pointId = points->InsertNextPoint(point);
+                polyLine->GetPointIds()->InsertNextId(pointId);
+            }
+
+            double point[3];
+            point[0] = pts[0];
+            point[1] = pts[1];
+            point[2] = pts[2];
+            // add by HSS for direction
+            linearTransform(rotMat, rotBase, point);
+            pointId = points->InsertNextPoint(point);
+            polyLine->GetPointIds()->InsertNextId(pointId);
+            cell->InsertNextCell(polyLine);
+        }
+
+        if (iPointsOutsideBoundary > 0)
+        {
+            std::cout << " --" << iPointsOutsideBoundary
+                      << " contour points detected outside image boundary. Please check the output volume. ";
+            iPointsOutsideBoundary = 0;
+        }
+
+        contours->SetPoints(points);
+        contours->SetLines(cell);
+        contours->Modified();
+
+        // convert the contours to itkImage
+        if (contours->GetNumberOfPoints() == 0)
+        {
+            continue;
+        }
+
+        // get bounds
+        double bounds[6];
+        contours->GetBounds(bounds);
+        // base on bounds get spacing origin and dimension for calculation
+        int Xmin = floor((bounds[0] - origin3d[0]) / spacing3d[0]) - 1;
+        int Xmax = floor((bounds[1] - origin3d[0]) / spacing3d[0]) + 2;
+        int Xextent = Xmax - Xmin;
+        double originX = Xmin * spacing3d[0] + origin3d[0];
+        int Ymin = floor((bounds[2] - origin3d[1]) / spacing3d[1]) - 1;
+        int Ymax = floor((bounds[3] - origin3d[1]) / spacing3d[1]) + 2;
+        int Yextent = Ymax - Ymin;
+        double originY = Ymin * spacing3d[1] + origin3d[1];
+        int Zmin = floor((bounds[4] - origin3d[2]) / spacing3d[2]) - 1;
+        int Zmax = floor((bounds[5] - origin3d[2]) / spacing3d[2]) + 2;
+        int Zextent = Zmax - Zmin;
+        double originZ = Zmin * spacing3d[2] + origin3d[2];
+        double spacing[3] = { spacing3d[0], spacing3d[1], spacing3d[2] };
+        double origin[3] = { originX, originY, originZ };
+        int dimension[3] = { Xextent + 1, Yextent + 1, Zextent + 1 };
+        // prepare the binary image's voxel grid
+        vtkSmartPointer<vtkImageData> whiteImage = vtkSmartPointer<vtkImageData>::New();
+        whiteImage->SetSpacing(spacing);
+        whiteImage->SetExtent(0, dimension[0] - 1, 0, dimension[1] - 1, 0, dimension[2] - 1);
+        whiteImage->SetOrigin(origin);
+        whiteImage->AllocateScalars(VTK_UNSIGNED_CHAR, 1);
+        //vtkIdType count = whiteImage->GetNumberOfPoints();
+        whiteImage->GetPointData()->GetScalars()->Fill(255);
+        // polygonal data --> image stencil:
+        vtkSmartPointer<vtkPolyDataToImageStencil> pol2stenc = vtkSmartPointer<vtkPolyDataToImageStencil>::New();
+        pol2stenc->SetTolerance(0); // important if extruder->SetVector(0, 0, 1) !!!
+        pol2stenc->SetInputData(contours);
+        pol2stenc->SetOutputOrigin(origin);
+        pol2stenc->SetOutputSpacing(spacing);
+        pol2stenc->SetOutputWholeExtent(whiteImage->GetExtent());
+        pol2stenc->Update();
+        // cut the corresponding white image and set the background:
+        vtkSmartPointer<vtkImageStencil> imgstenc = vtkSmartPointer<vtkImageStencil>::New();
+        imgstenc->SetInputData(whiteImage);
+        imgstenc->SetStencilConnection(pol2stenc->GetOutputPort());
+        imgstenc->ReverseStencilOff();
+        imgstenc->SetBackgroundValue(0);
+        imgstenc->Update();
+        vtkSmartPointer<vtkImageData> imageOrganVtk = imgstenc->GetOutput();
+        // to itk
+        typedef itk::VTKImageToImageFilter<MaskType> VTKImageToImageType;
+        VTKImageToImageType::Pointer vtkImageToImageFilter = VTKImageToImageType::New();
+        vtkImageToImageFilter->SetInput(imageOrganVtk);
+        vtkImageToImageFilter->Update();
+        // deep copy image
+        MaskType::Pointer imageOrgan = vtkImageToImageFilter->GetOutput();
+        MaskType::Pointer imageOrganCopy = MaskType::New();
+        // imageOrganCopy->SetOrigin(imageOrgan->GetOrigin()); origion must be rotated back
+        imageOrganCopy->SetRegions(imageOrgan->GetLargestPossibleRegion());
+        imageOrganCopy->SetSpacing(imageOrgan->GetSpacing());
+        // direction consider
+        double originRoi[3] { 0 };
+
+        for (int k = 0; k < 3; ++k)
+            originRoi[k] = imageOrgan->GetOrigin()[k];
+
+        linearTransform(rotMatInv, rotBase, originRoi);
+        ImageType::PointType originRoiItk;
+
+        for (int k = 0; k < 3; ++k)
+            originRoiItk[k] = originRoi[k];
+
+        imageOrganCopy->SetOrigin(originRoiItk);
+        imageOrganCopy->SetDirection(direction);
+        imageOrganCopy->Allocate();
+        // end add by HSS
+        itk::ImageRegionConstIterator<MaskType> inputIterator(imageOrgan, imageOrgan->GetLargestPossibleRegion());
+        itk::ImageRegionIterator<MaskType> outputIterator(imageOrganCopy, imageOrganCopy->GetLargestPossibleRegion());
+
+        while (!inputIterator.IsAtEnd())
+        {
+            outputIterator.Set(inputIterator.Get());
+            ++inputIterator;
+            ++outputIterator;
+        }
+
+        //push back
+        maskVec.push_back(imageOrganCopy);
+        nameVec.push_back(str_currentOrgan);
+    } // next structure name
+
+    return 0;
+}
+
+
diff --git a/src/dvh/dcmIO.h b/src/dvh/dcmIO.h
new file mode 100644
index 0000000..35d5d0a
--- /dev/null
+++ b/src/dvh/dcmIO.h
@@ -0,0 +1,80 @@
+#pragma once
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+
+#include "itkStlCompat.h"
+#include "dvhTypes.h"
+
+#define DBG_DISP false
+
+#include <string>
+#include <vector>
+#include <iostream>
+#include <fstream>
+#include <algorithm>
+#include <cmath>
+#include <cstring>
+
+#include <itkImage.h>
+#include <itkGDCMImageIO.h>
+#include <itkGDCMImageIOFactory.h>
+#include <itkGDCMSeriesFileNames.h>
+#include <itkImageSeriesReader.h>
+#include <itkImageFileReader.h>
+#include <itkImageFileWriter.h>
+#include <itkPoint.h>
+#include <itkImageSliceIteratorWithIndex.h>
+#include <itkImageIteratorWithIndex.h>
+#include <itkExtractImageFilter.h>
+#include <itkGroupSpatialObject.h>
+#include <itkSpatialObjectToImageFilter.h>
+#include <itkPolygonSpatialObject.h>
+#include <itkImageRegionIterator.h>
+#include <itkResampleImageFilter.h>
+#include <itkNearestNeighborInterpolateImageFunction.h>
+#include <itkVersorRigid3DTransform.h>
+#include <itkLinearInterpolateImageFunction.h>
+#include <itkMinimumMaximumImageCalculator.h>
+#include <itkVTKImageToImageFilter.h>
+
+#include <vtkPolyData.h>
+#include <vtkSmartPointer.h>
+#include <vtkCellArray.h>
+#include <vtkPoints.h>
+#include <vtkPointData.h>
+#include <vtkPolyLine.h>
+#include <vtkImageData.h>
+#include <vtkPolyDataToImageStencil.h>
+#include <vtkImageStencil.h>
+
+#include <gdcmTypes.h>
+#include <gdcmReader.h>
+#include <gdcmSmartPointer.h>
+#include <gdcmAttribute.h>
+#include <gdcmSequenceOfItems.h>
+#include <gdcmFileMetaInformation.h>
+#include <gdcmMediaStorage.h>
+
+int itkMetaDataReader(
+    const std::string metaDataFile,
+    itk::Image<float, 3>::Pointer& image);
+
+int itkMetaMaskReader(
+    const std::string maskDataFile,
+    itk::Image<unsigned char, 3>::Pointer& mask);
+
+int itkDcmDoseReader(
+    const std::string dcmDoseFile,
+    itk::Image<float, 3>::Pointer& dose);
+
+int itkDicomSeriesReader(
+    const std::string dicomFilesPath,
+    itk::Image<float, 3>::Pointer& image);
+
+int itkRtStructureReader(
+    std::string rtsFilePath,
+    itk::Image<float, 3>::Pointer image,
+    std::vector<std::string>& nameVec,
+    std::vector<itk::Image<unsigned char, 3>::Pointer>& maskVec);
diff --git a/src/dvh/dvhTypes.h b/src/dvh/dvhTypes.h
new file mode 100644
index 0000000..41c4a73
--- /dev/null
+++ b/src/dvh/dvhTypes.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <string>
+
+#define DVH_MAX_SPN 2000
+
+#define ERR_ER_LOAD_IMGE -10004
+#define ERR_ER_LOAD_DOSE -10005
+#define ERR_LOAD_DOSE_RT -10006
+#define ERR_LOAD_RTSTRUC -10007
+
+struct Struc {
+  std::string strucName;
+  int datSz = 0;
+  int innSz = 0;
+  int size[3] = {0, 0, 0};
+  float origin[3] = {0, 0, 0};
+  float spacing[3] = {0, 0, 0};
+  unsigned char* h_dat = nullptr;
+  unsigned char* d_dat = nullptr;
+  float* h_innDat = nullptr;
+  float* d_innDat = nullptr;
+};
+
+struct StrucSet {
+  std::string tagName;
+  int strucNum = 0;
+  Struc* struc = nullptr;
+};
diff --git a/src/dvh/itkStlCompat.h b/src/dvh/itkStlCompat.h
new file mode 100644
index 0000000..170c9b6
--- /dev/null
+++ b/src/dvh/itkStlCompat.h
@@ -0,0 +1,26 @@
+#pragma once
+
+// ITK 4.13 still uses std::unary_function / binary_function removed from modern MSVC STL.
+#include <functional>
+
+#ifndef _DOSECOMPARE_ITK_STL_COMPAT_
+#define _DOSECOMPARE_ITK_STL_COMPAT_
+#if defined(_MSC_VER)
+namespace std {
+#if !defined(_HAS_AUTO_PTR_ETC) || !_HAS_AUTO_PTR_ETC
+template <class Arg, class Result>
+struct unary_function {
+  typedef Arg argument_type;
+  typedef Result result_type;
+};
+
+template <class Arg1, class Arg2, class Result>
+struct binary_function {
+  typedef Arg1 first_argument_type;
+  typedef Arg2 second_argument_type;
+  typedef Result result_type;
+};
+#endif
+} // namespace std
+#endif
+#endif
diff --git a/src/main.cpp b/src/main.cpp
index 157f69c..3877d5b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,4 +1,4 @@
-#include "MainWindow.h"
+#include "AppShell.h"
 
 #include <QApplication>
 #include <QSurfaceFormat>
@@ -7,6 +7,8 @@
 
 #include <QVTKOpenGLWidget.h>
 
+#include "ProfileComparePage.h"
+
 int main(int argc, char* argv[])
 {
   QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFormat());
@@ -16,13 +18,14 @@ int main(int argc, char* argv[])
   QApplication::setOrganizationName(QStringLiteral("Manteia"));
   QApplication::setWindowIcon(QIcon(QStringLiteral(":/dosecompare.png")));
 
-  MainWindow w;
+  AppShell w;
   w.setWindowIcon(QIcon(QStringLiteral(":/dosecompare.png")));
   w.show();
 
   if (argc > 1) {
+    w.openProfileApp();
     QString err;
-    if (!w.loadDoseFile(QString::fromLocal8Bit(argv[1]), &err))
+    if (!w.profilePage()->loadDoseFile(QString::fromLocal8Bit(argv[1]), &err))
       QMessageBox::warning(&w, QObject::tr("导入失败"), err);
   }