I was wondering if there was a way to change the HU tolerance for the Uniformity (CTP486) and Linearity (CTP404) separately. I saw that both can be changed using hu_tolerance which changes both the HU uniformity and linearity.
However I just want the uniformity tolerance to be ±30 HU from the center ROI and the linearity tolerances to be ±50. I was wondering where I could find the HU value analyzed for the center ROI for the uniformity module.
Unfortunately, there isn’t a way to decouple these currently out of the box. However, the data is there under the hood. Here is a gist to compare the center uniformity ROI to the surrounding ones within 30 HU. Center Unif ROI (github.com).
The same approach can be taken for the linearity module using the ctp404.hu_rois attribute. See this section and related class for what data is available CatPhan — pylinac 3.8.0 documentation CatPhan — pylinac 3.8.0 documentation