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<p class=MsoNormal>Hi Folks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m trying to display image planes in a
vtkImageViewer2 without much luck. My current pipeline looks like:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>
vtkTransform<o:p></o:p></p>
<p class=MsoNormal> |<o:p></o:p></p>
<p class=MsoNormal> V<o:p></o:p></p>
<p class=MsoNormal>vtkDICOMImageReader->vtkImageReslice->vtkImageViewer2<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If I try to display an Axial slice, it works fine, if I try
to display sagittal or coronal slices I don’t see the images. If I
insert a vtkImageChangeInformation object after the vtkDICOMImageReader, I can
see the sagittal and coronal images as well as the axial. This causes a
problem because I am trying to coordinate other displays with the resliced
result. I need to see the images without using the
vtkImageChangeInformation object.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve tried to explicitly set the bounds on the
vtkImageActor managed by the vtkImageViewer2, with no luck. I’ve
also tried to place the vtkCamera to point at the center of the plane along the
direction of the normal. Didn’t work either.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>There may be a fundamental misunderstanding on my part as to
how vtkImageReslice works. I am assuming that the resulting resliced
volume would be displayed the same as an axial image, so I am leaving the vtkImageViewer2->SetSliceOrientationXY()
and moving between slices with the SetSlice method.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The eventual goal is to reslice the image volume at oblique
angles, but I figure I’m on the right track if I can get the sagittal and
coronal images to display correctly.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m concerned that vtkImageViewer2 is doing something
for me that I don’t want it to do. Do I need to manage my own
vtkImageActor?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>A code snippet for the Coronal images follows:<o:p></o:p></p>
<p class=MsoNormal>(input is the vtkDICOMImageReader)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _transform = vtkTransform::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _transform->RotateZ(0.0);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _transform->RotateX(90.0);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _transform->RotateY(0.0);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _reslice =
vtkImageReslice::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
_reslice->SetOutputDimensionality(3);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
_reslice->SetResliceTransform(_transform);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
_reslice->SetInputConnection(input);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _reslice->Update();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
inputData=vtkImageData::SafeDownCast(_reslice->GetInput());<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> inputData->GetCenter(center);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _transform->Translate(center[0],
center[1], center[2]);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _interactor =
vtkRenderWindowInteractor::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _imageViewer =
vtkImageViewer2::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
_imageViewer->SetupInteractor(_interactor);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> _imageViewer->SetSize(400,
400);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
_imageViewer->SetColorWindow(1024);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
_imageViewer->SetColorLevel(800);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'>
_imageViewer->SetInputConnection(_reslice->GetOutputPort());<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any ideas appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> --
Scott<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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