void CenterPart::calculateGma()
{
    // first get gamma information from GUI
    int dta = this->gmDLEd->text().toInt();
    int dd  = this->gmVLEd->text().toInt();
    int thred = this->gmCLEd->text().toInt();

    if (dta <= 0 || dd <= 0 || thred <= 0 ||
        dta > 7 || dd > 7 || thred > 100)
    {
        QMessageBox::warning(this, tr("Warning"), \
                             tr("Load Wrong gamma parameters!"), QMessageBox::Yes);
        return;
    }

    // load DLL
    std::string autoDgDllFile = this->execPath + "/algo/GammaMapLib";
    std::string postFix = ".dll";
#ifdef _DEBUG
    postFix = "D.dll";
#endif
    autoDgDllFile += postFix;
    HINSTANCE hInst = LoadLibrary(autoDgDllFile.c_str());

    // check dll file
    if (hInst == nullptr)
    {
        QMessageBox::warning(this, tr("Warning"), \
                             tr("No reference GammaMapLib DLL!"), QMessageBox::Yes);
        return;
    }

    // function
    typedef float(*pGamma3D)(float * originR,
                             float * spacingR,
                             int* sizeR,
                             float * doseR,
                             float * originE,
                             float * spacingE,
                             int* sizeE,
                             float * doseE,
                             float** gammaMap,
                             int dta,
                             int dd,
                             int thred);
    pGamma3D gamma3D = (pGamma3D)GetProcAddress(hInst, "gamma3D");

    // check function
    if (gamma3D == nullptr)
    {
        QMessageBox::warning(this, tr("Warning"), \
                             tr("No reference gamma3D function in DLL!"), QMessageBox::Yes);
        return;
    }

    std::cout << "POOOKOK" << std::endl;
    // load image
    int ret = 0;
    std::string refDoseF = this->rtdPath + "/doseRef.mhd";
    std::string evaDoseF = this->rtdPath + "/doseCuMcMc.mhd";

    if (this->mtdTyp == 0)
    {
        evaDoseF = this->rtdPath + "/doseGoMcMc.mhd";
    }
    else if (this->mtdTyp == 1)
    {
        evaDoseF = this->rtdPath + "/doseCuMcMC.mhd";
    }
    else if (this->mtdTyp == 2)
    {
        evaDoseF = this->rtdPath + "/doseVsMcMc.mhd";
    }
    else if (this->mtdTyp == 3)
    {
        evaDoseF = this->rtdPath + "/doseDcPB.mhd";
    }

    float originR[3];
    float spacingR[3];
    int sizeR[3];
    float* doseR;
    float originE[3];
    float spacingE[3];
    int sizeE[3];
    float* doseE;
    ret |= readMhd(refDoseF, &doseR, originR, spacingR, sizeR);
    ret |= readMhd(evaDoseF, &doseE, originE, spacingE, sizeE);

    if (ret < 0)
    {
        QMessageBox::warning(this, tr("Warning"), \
                             tr("No reference or result dose!"), QMessageBox::Yes);
        return;
    }

    // call
    float* gammaMap;
    float gamma = gamma3D(originR, spacingR, sizeR, doseR, originE, spacingE, sizeE, doseE, &gammaMap, dta, dd, thred);
    this->gmaLEd->setText(QString::number(gamma * 100, 'f', 5));
}