Abdominal and trunk muscles on CT

From T4 to L4, TotalSegmentator segments 11 trunk and abdominal wall muscles per side on CT scans, among them rectus abdominis, the external and internal obliques, psoas major, quadratus lumborum, and erector spinae. Muscle segmentation on CT at this detail lets studies compare volumes between groups, between left and right, and over time. On PET or SPECT, uptake can be read per muscle and compared between groups or scan dates, next to muscle size.

Find answers to research questions like: How much do trunk muscle volumes change between two scans of the same person? How does muscle uptake relate to muscle size? Which spine level best represents total trunk muscle volume?