Hello,
I would like to create some DRRs from a 3DCT. I have one arc beam with some different controllpoints. If I want to generate a DRR with DDR Image Computation of this beam, it only generates a DRR for the first beam position. For me it is not possible to choose one of the other beam-controllpoints. Is there any possibility to select the other controllpoints?
Thanks for your help!
@Mik do you have any insights?
Arc beam sequence doesn’t have correct support, because i can’t find a test dataset to test it. If you need to calculate DRR images for a particular set of control points (beam angles, isocenter positions), its easier to execute a small script in python console.
See Example 3 (CT Volume only, beam is set manually, isocenter is set manually)
If you can share DICOM files with defined arc beam control points in RTPLAN, then support for arc beams can be done quite fast.
Thanks for bringing this up! @ruju a set of anonymized VMAT plan data would be a lot of help for us! @Mik I’ll ask a few new partners in case they can help us.
Thank you!
Here is one data set of a phantom with CT and an arc beam in RTplan. SwissTransfer - Send large files securely and free of charge
For the dataset above the beam parameters are loaded as a sequence, you can choose Sequences→Sequencesin modules menu. There you can press Play/Pausebutton, and see the behavior (movement) of the beam. Beam parameters are available for each control point via Beams module. DRR image will be calculated for corresponding beam orientation (control point).
Beam parameters for the last control point:
Minor correction, in your data SourceAxisDistance is 1000 mm, but Beams module says that the source distance is 2000 mm (which is wrong), you can set correct parameter in GUI interface, and get correct beam representation and DRR calculation.
