Hello, I have doubt about using drr generation in 3d slicer.I am attaching the result I got after using DRR generation. What are the parameters I have to set for proper display of the 2d Xray image in 2d views?.
Have you tried to use DRR Image Computation module which is a also a part of SlicerRT extension? It has an additional markups elements that visualize imager, normal and view-up vectors, but you have to setup a dummy RTplan and RTBeam nodes in order to use that module properly.
Or you cat to use a python script below, where isocenterPosition variable is RAS coordinates of the beam isocenter.
# Create dummy plan
rtImagePlan = slicer.mrmlScene.AddNewNodeByClass( 'vtkMRMLRTPlanNode', 'rtImagePlan')
# Create RTImage dummy beam
rtImageBeam = slicer.mrmlScene.AddNewNodeByClass( 'vtkMRMLRTBeamNode', 'rtImageBeam')
# Set required beam parameters
rtImageBeam.SetGantryAngle(90.)
rtImageBeam.SetCouchAngle(12.)
# Add beam to the plan
rtImagePlan.AddBeam(rtImageBeam)
# Get CT volume
ctVolume = slicer.mrmlScene.GetFirstNodeByClass('vtkMRMLScalarVolumeNode')
# Set and observe CT volume by the plan
rtImagePlan.SetAndObserveReferenceVolumeNode(ctVolume)
# Set required isocenter position as a point
rtImagePlan.SetIsocenterSpecification(slicer.vtkMRMLRTPlanNode.ArbitraryPoint)
isocenterPosition = [ -1., -2., -3. ]
if (rtImagePlan.SetIsocenterPosition(isocenterPosition)):
print('New isocenter position is set')
# Create DRR image computation node for user imager parameters
rtImageParameters = slicer.mrmlScene.AddNewNodeByClass('vtkMRMLDrrImageComputationNode', 'rtImageBeamParams')
# Set and observe RTImage beam by the DRR node
rtImageParameters.SetAndObserveBeamNode(rtImageBeam)
# Set required DRR parameters
rtImageParameters.SetHUThresholdBelow(50)
# Get DRR computation logic
drrLogic = slicer.modules.drrimagecomputation.logic()
# Update imager markups for the 3D view and slice views (optional)
drrLogic.UpdateMarkupsNodes(rtImageParameters)
# Update imager normal and view-up vectors (mandatory)
drrLogic.UpdateNormalAndVupVectors(rtImageParameters) # REQUIRED
# Compute DRR image
drrLogic.ComputePlastimatchDRR( rtImageParameters, ctVolume)
