[vtkusers] vtkImageReslice problem

[Jothy]

Hi all,

I am using vtkImageReslice to slice an 3D image data. But the problem is
whatever slice value I set, it return the same image.

Can someone have a look at the transformation matrix and the code, please?

// Calculate the center of the volume

      this->center[0] = this->origin[0] + this->spacing[0] * 0.5 *
(this->extent[0] + this->extent[1]);

      this->center[1] = this->origin[1] + this->spacing[1] * 0.5 *
(this->extent[2] + this->extent[3]);

      this->center[2] = this->origin[2] + this->spacing[2] * 0.5 *
(this->extent[4] +this->extent[5]);

      qDebug()<<this->center[0]<<this->center[1]<<this->center[2];

      // Matrices for axial, coronal, sagittal, oblique view orientations

//       double axialElements[16] = {

//               1, 0, 0, 0,

//               0, 1, 0, 1,

//               0, 0, 1, sliceA,

//               0, 0, 0, 1 };

      static double coronalElements[16] = {

               1, 0, 0, 0,

               0, 0, 1, sliceA,

               0,-1, 0, 0,

               0, 0, 0, 1 };

//      static double sagittalElements[16] = {

//               0, 0,-1, 0,

//               1, 0, 0, 0,

//               0,-1, 0, 0,

//               0, 0, 0, 1 };

      //static double obliqueElements[16] = {

      //         1, 0, 0, 0,

      //         0, 0.866025, -0.5, 0,

      //         0, 0.5, 0.866025, 0,

      //         0, 0, 0, 1 };

      // Set the slice orientation

      vtkSmartPointer<vtkMatrix4x4> resliceAxes =

        vtkSmartPointer<vtkMatrix4x4>::New();

      resliceAxes->DeepCopy(coronalElements);

      // Set the point through which to slice

      resliceAxes->SetElement(0, 3, center[0]);

      resliceAxes->SetElement(1, 3, center[1]);

      resliceAxes->SetElement(2, 3, center[2]);

      // Extract a slice in the desired orientation

      vtkSmartPointer<vtkImageReslice> reslice =

        vtkSmartPointer<vtkImageReslice>::New();

      reslice->SetInput(this->imgData);

      reslice->SetOutputDimensionality(2);

      reslice->SetResliceAxesOrigin(10,20,20);

      reslice->SetResliceAxes(resliceAxes);

      reslice->SetInterpolationModeToLinear();

//      reslice->GetOutput()->UpdateInformation();

//      reslice->GetOutput()->UpdateData();

//       reslice->GetOutput()->Update();

      // Create a greyscale lookup table

      vtkSmartPointer<vtkLookupTable> table =

        vtkSmartPointer<vtkLookupTable>::New();

      table->SetRange(-300, 900); // image intensity range

      table->SetValueRange(0.0, 1.0); // from black to white

      table->SetSaturationRange(0.0, 0.0); // no color saturation

      table->SetRampToLinear();

      table->Build();

      // Map the image through the lookup table

      vtkSmartPointer<vtkImageMapToColors> color =

        vtkSmartPointer<vtkImageMapToColors>::New();

      color->SetLookupTable(table);

      color->SetInput(reslice->GetOutput());

      // Display the image

    this->actor =vtkImageActor::New();

      actor->SetInput(color->GetOutput());

      vtkSmartPointer<vtkRenderer> renderer =

        vtkSmartPointer<vtkRenderer>::New();

      renderer->AddActor(actor);

//      vtkSmartPointer<vtkRenderWindow> window =

//        vtkSmartPointer<vtkRenderWindow>::New();

      this->ui->AxialWidget->GetRenderWindow()->AddRenderer(renderer);

      // Set up the interaction

      vtkSmartPointer<vtkInteractorStyleImage> imageStyle =

        vtkSmartPointer<vtkInteractorStyleImage>::New();

      vtkSmartPointer<vtkRenderWindowInteractor> interactor =

        vtkSmartPointer<vtkRenderWindowInteractor>::New();

      interactor->SetInteractorStyle(imageStyle);

      this->ui->AxialWidget->GetRenderWindow()->SetInteractor(interactor);

      this->ui->AxialWidget->GetRenderWindow()->Render();

     // this->ui->AxialWidget->show();


Thanks,

Jothy

-- 
Research Scholar
Dept. of Medical Physics
Clatterbridge Centre for Oncology
UK
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