I would like to know what values are recommended for the “tolerance” and “action_tolerance” parameters to analyze the image. I would also like to know if it is possible to use the algorithm to analyze CR images (computerized radiotherapy) or whether it necessarily needs to be EPID images.
This is the job of the physicist. It depends on your linac, linac age, maintenance schedule, treatment types delivered, etc. TG-142 gives a guideline but it’s pretty loose.
As for CR, if you scan it as a TIFF you can somewhat convert it to a DICOM which pylinac would analyze. See the conversion guide here: DICOM Conversion Guide - pylinac 3.31.0 documentation