Hi, You might have missed an earlier message WARNING: In /home/srit/src/itk/itk/Modules/Remote/RTK/src/rtkThreeDCircularProjectionGeometry.cxx, line 210 DataObject (0x55d436d7ee10): Failed to AddProjection The problem is that the two vectors describing the projection orientation are not unit vector. You can correct this with: geometry.AddProjection([-60.0, 59.0 + sid, 34.0],[-60.0 + 115., 59.0+sid-sdd, 34.0],[1./math.sqrt(2.),1./math.sqrt(2.),0.],[0.,0.,1.]) Simon
On Fri, Dec 9, 2022 at 1:43 PM Suranga W <isurusuranga.wijesin...@gmail.com> wrote: > Hi, > > I attempted to generate DRRs by adding the geometry configuration to the > ThreeDCircularProjectionGeometry object, as shown in the attached code > (python based code). However, I encountered a runtime error as below > (please look at the end of the email). > > On the other hand, how can I pass the relevant gantry angle to it for > generating DRRs at different angles if I add geometry configuration using > the addProjection method as mentioned in my code? > > What I mean is that if I use the code below to set machine parameters, I'm > not able to add the corresponding gantry angle for generating DRRs. > > *geometry.AddProjection([-60.0, 59.0 + sid, 34.0],[-60.0 + 115., > 59.0+sid-sdd, 34.0],[1.,1.,0.],[0.,0.,1.])* > > where [-60.0, 59.0, 34.0] represents the patient's isocenter. > > However, if I use the code below, I can use the gantry angle but I > cannot set the machine geometry configuration. > > *geometry.AddProjection(sid, sdd, gantryAngle, projOffsetX, projOffsetY, > outOfPlaneAngle, inPlaneAngle, sourceOffsetX, sourceOffsetY)* > > I attached a CT volume for your further reference. > > Please assist me in resolving this issue. > > ---------------------------------------------------------------------------RuntimeError > Traceback (most recent call last) > Cell In [29], line 45 43 rei.SetInput(0, constantImageSource.GetOutput()) > 44 rei.SetInput(1, CT)---> 45 rei.Update() 47 Dimension = 3 48 > OutputPixelType = itk.UC > RuntimeError: > D:\a\im\include\rtkProjectionsRegionConstIteratorRayBased.hxx:88: > ITK ERROR: Geometry is empty, cannot determine iterator type. > > drr_projection_with_diff_angles.txt > <https://drive.google.com/file/d/1Ags89Lpczvrk_rdHpGSqDcBrashzNSZr/view?usp=drive_web> > sample_CT.nii.gz > <https://drive.google.com/file/d/1SGh0cjspFwTj2v8qTLXtcCfbUvyUENS5/view?usp=drive_web> > > > > >
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