Flatness and symmetry

[smedphys]

Is your feature request related to a problem? Please describe.
The request is not related to a problem.

Describe the solution you'd like
I am interested in adding a region of interest on the CAX and calculating the mean. This would help in creating a quick baseline for monthly output variation at cardinal gantry angles. Would that be possible?

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[jrkerns]

If you're talking about 1D profiles, this section should help: https://pylinac.readthedocs.io/en/latest/topics/profiles.html. You can create your own types of metrics (e.g the mean of the central 1cm or something). Similar things can be done for 2D: https://pylinac.readthedocs.io/en/latest/topics/image_metrics.html