[vtkusers] display dicom image in vtk

[John Drescher]

On Thu, Apr 2, 2009 at 9:07 PM, Hui Wang <cougarhui at yahoo.com> wrote:
> Hi, all
>
> I am new to vtk and want to read a dicom image from file and display it in a
> Qt GUI using qvtkWidget.
>
> I used vtkDICOMImageReader to read the image, but when I used vtkImageViewer
> to display, it will show in another window, instead of qvtkWidget.
>
> So I tried vtkImageActor, vtkRenderer and vtkRendererWindow pipeline, but an
> error happened saying
>
> ERROR: In /home/mandrake/rpm/BUILD/VTK/Rendering/vtkImageActor.cxx, line
> 182
> vtkOpenGLImageActor (0x10ed8b0): This filter requires unsigned char scalars
> as input
>
> Then I tried vtkImageCast, but the displayed image is not correct. Does
> anybody know the reason and how to fix it?  Thanks a lot.
>
> Hui Wang
>
>
> The following is the code I used:
>
>         vtkDICOMImageReader *reader = vtkDICOMImageReader::New();
>         reader->SetFileName(argv[1]);
>
>         vtkImageCast *cast = vtkImageCast::New();
>         cast->SetInputConnection(reader->GetOutputPort());
>         cast->SetOutputScalarTypeToUnsignedChar();
>
>         vtkImageActor *actor = vtkImageActor::New();
>         actor->SetInput(cast->GetOutput());
>
>         vtkRenderer *render = vtkRenderer::New();
>         render->AddActor(actor);
>         render->ResetCamera();
>
>         vtkRenderWindow *window = vtkRenderWindow::New();
>         window->AddRenderer(render);
>
>         window->Render();
>
>
>

Try the vtkImageMapToWindowLevelColors instead. You will most likely
need to do that anyways.

John