Hi all.
I’m using the 3D Slicer program. As far as I know, this program was based on the VTK library.
The below image is a screenshot of the 3D Slicer program UI.
I used DICOM images from the VTK ReadDICOMSeries example.
So, my question is… how to make a point cloud data from DICOM series.
Such like right upper image.
Is it possible to make a point cloud data from DICOM series using the VTK library?
If yes, could you please let me know the C++ example code?
Thank you!
You can check the vtkConvertToPointCloud Filter. I hope that helps
Thank you for your reply.
but… could you please explain detail? 
I tried to read DICOM files and convert to PCD, using as the below code:
vtkNew<vtkDICOMImageReader> reader;
reader->SetDirectoryName(folder.c_str());
reader->Update();
vtkNew<vtkConvertToPointCloud> cvtPcd;
cvtPcd->AddInputConnection(reader->GetOutputPort());
cvtPcd->Update();
And using the below example code:
https://kitware.github.io/vtk-examples/site/Cxx/Points/ExtractSurfaceDemo/
//auto polyData = ReadPolyData(argc > 1 ? argv[1] : "");
auto polyData = cvtPcd->GetOutput();
//except above line, all the code the same.
This is my result…
The image in the upper right looks like a volume rendering. Please take a look at VTK’s Volume Rendering examples to learn more.
Do you want to get a point cloud out of the image and color it using your image scalar values? or do you want to volume render your image?
Hi all. Thank you for your help.
I’m sorry for my late reply.
I found that the sample code is already exist what I want.
https://kitware.github.io/vtk-examples/site/Cxx/VolumeRendering/FixedPointVolumeRayCastMapperCT/
It worked well for me.
Thank you!
