"XROI, kneeImg, REGIONS_OUT = femurROIout, STATISTICS = femurStats" gives me ROI region from femurROIout. I can do "XROI, kneeImg, REGIONS_IN = femurROIout, STATISTICS = tibiaStats" to define the same region for a different image. I need statistic data for same region from different images. My question is how I can do this without opening XROI window. Once user defines a ROI, program automatically retrieve the data from the rest.