<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:"tahoma", "new york", "times", serif;font-size:10pt"><p><br></p><p>Hello Yang,</p><p><br></p><p><br></p><p>I send you a example. Look at vtkLookupTable (SetTableRange()) for the change of threshold or Hounsfield units. </p><p><br></p><p><br></p><p>//Display 2D-CT-Data (Axial)</p><p><br></p><p>this->displayImageAxial->show(); //FLTK Box<br> this->displayImageAxial->redraw();<br></p><p><br></p><p>vtkInteractorStyleTrackballCamera* modeAxial = vtkInteractorStyleTrackballCamera::New();<br><br> vtkRenderer* rendererAxial = vtkRenderer::New();<br><br> renderWindowAxial* renderWindowAxial = vtkRenderWindow::New();<br> renderWindowAxial->AddRenderer(rendererAxial);<br><br> displayImageAxial->SetRenderWindow(renderWindowAxial);<br> displayImageAxial->SetInteractorStyle(modeAxial);<br>
displayImageAxial->Initialize();<br><br><br> vtkLookupTable* hueLut = vtkLookupTable::New();<br><span> hueLut->SetTableRange (-250,1200); // -250= L 1200= W (<a target="_blank" href="http://en.wikipedia.org/wiki/Hounsfield_scale">http://en.wikipedia.org/wiki/Hounsfield_scale</a>)</span><br> hueLut->SetSaturationRange (0, 0);<br> hueLut->SetHueRange (0, 0);<br> hueLut->SetValueRange (0, 2);<br> hueLut->Build(); //effective built<br><br> vtkImageMapToColors *colorsAxial = vtkImageMapToColors::New();<br> colorsAxial->SetInput(reader2D->GetOutput());<br> colorsAxial->SetLookupTable(hueLut);<br><br> vtkImageActor* actorAxial = vtkImageActor::New();<br> actorAxial->SetInput(colorsAxial->GetOutput());<br> actorAxial->SetOpacity(1.0);<br>actorAxial->SetDisplayExtent(0,reader2D->GetWidth()-1 , 0,reader2D->GetHeight()-1,
numberOfFilesOnSelectedFolder/2,numberOfFilesOnSelectedFolder/2); //0,511, 0,511, 100, 100<br> <br> <br> vtkCamera* cameraAxial = vtkCamera::New();<br> cameraAxial->SetViewUp(0, 0, -1);<br> cameraAxial->SetPosition(0, 1, 0);<br> cameraAxial->SetFocalPoint(0, 0, 0);<br> cameraAxial->ComputeViewPlaneNormal(); <br> cameraAxial->Roll(90);<br> cameraAxial->Azimuth(90);<br> cameraAxial->Roll(-90);<br> <br> <br> rendererAxial->AddActor(actorAxial);<br> rendererAxial->SetActiveCamera(cameraAxial);<br> rendererAxial->ResetCamera();<br> cameraAxial->Dolly(1.0);<br> rendererAxial->ResetCameraClippingRange();<br><br></p><p><br></p><div> </div>Mit freundlichen Grüßen<br>Yusuf ÖZBEK<div><br></div><div style="font-family:tahoma, new york, times, serif;font-size:10pt"><br><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><font size="2" face="Tahoma"><hr size="1"><b><span
style="font-weight: bold;">Von:</span></b> Xiaopeng Yang <yxp233@postech.ac.kr><br><b><span style="font-weight: bold;">An:</span></b> vtkusers@vtk.org; insight-users@itk.org<br><b><span style="font-weight: bold;">Gesendet:</span></b> Mittwoch, den 15. Dezember 2010, 13:04:51 Uhr<br><b><span style="font-weight: bold;">Betreff:</span></b> [Insight-users] 2D CT image visualization problem<br></font><br><style><!--
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--></style><div class="WordSection1"><p class="MsoNormal">Hello everyone,</p><p class="MsoNormal"> </p><p class="MsoNormal">I applied VTKimageViewer2 to visualize 2D CT images. And I succeeded. Furthermore, I would like to only show the pixels within a given gray scale threshold interval. But I have no idea how to do it. I would appreciate any help.</p><p class="MsoNormal"> </p><p class="MsoNormal">Thank you very much,</p><p class="MsoNormal">Xiaopeng</p></div></div></div>
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