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jrkerns / pylinac

An image analysis library for medical physics
https://pylinac.readthedocs.io/en/latest/
MIT License
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IC Profiler symmetry value different than Profiler software calculation #440

Closed StephenTerry closed 1 year ago

StephenTerry commented 1 year ago

Describe the bug Symmetry calculations for IC Profiler measurements disagree from those calculated by the Profiler software. This seems to be due to the profiles stored in the horiz_profile and vert_profile variables are not symmetric about the CAX. This results in incorrect points being matched together when the profile is reversed in the symmetry calculation.

To Reproduce See gist at https://gist.github.com/StephenTerry/36c1dbffca05319687c33ab5571a8234 Output shown below.

Screenshots Figure_1

Additional context Adding an additional point to the right of the CAX by editing the "field values" key in the data dictionary of SingleProfile makes the pylinac symmetry calculation match the Profiler software calculation. I've created a pull request with this edit. https://github.com/jrkerns/pylinac/pull/439

jrkerns commented 1 year ago

Thanks for the explanation and proposed fix. Can you send me the profiler file so I can reproduce locally? Thanks!

jrkerns commented 1 year ago

Closed in #439