Generate digitally reconstructed radiograph from an 3DCT. How to choose different controllpoints of an arc beam?

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1

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!

2

@Mik do you have any insights?

3

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.