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Proton dose engine calculates dose with incorrect source position #256

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cpinter opened this issue Oct 15, 2024 · 0 comments
Open

Proton dose engine calculates dose with incorrect source position #256

cpinter opened this issue Oct 15, 2024 · 0 comments
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External Beam Pla...

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@cpinter
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cpinter commented Oct 15, 2024

The source position we set to the Plastimatch proton dose engine is correct, but the output dose looks like if the SAD were inverted (the source on the other side of the isocenter).

image

It worked the same way in Slicer 5.2.2 so the problem exists at least for a few years.
@cpinter cpinter added the bug label Oct 15, 2024
@cpinter cpinter added this to the External Beam Planning milestone Oct 15, 2024
cpinter added a commit that referenced this issue Oct 15, 2024
@cpinter
BUG: Workaround to fix Plastimatch proton engine beam source issue
4a33bea 
The source is calculated with -SAD so that the dose is calculated correctly. Need to fix the underlying problem in Plastimatch and revert this change.

Re #256
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