Catphan 604 CTP515 low contrast visibility 1% ROIs only

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1

Hi all,

I’m hoping to use pylinac to measure the low contrast visibility on the CTP515/CTP730 module. Can I ask the reason that only the 1% ROIs are examined? Is it a limitation of the method used? Or can the user add the other ROIs?
We usually record the 0.5% and 0.3% ROI values when doing this test manually.

Thanks
Tim

2

Hi,

I’d be interested to know what other pylinac users have done for this test.

Do you ignore the other rods on the low contrast module (CTP515 or 730) and just analyse the 1% contrast levels? Or perhaps analyse them manually or use a different method?

I assume there is a good reason that pylinac doesnt analyse the 0.5% and 0.3% constrast ROIs but I can’t find it in the manuals.

Thanks,
Tim

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