rib cartilage segmentation

How can I do the segmentation of the rib cartilage and measure the volume of the 7th and 8th rib cartilage? I need the volume to measure the degree of calcification for a study.

If you are working from CT the TotalSegmentator module or Auto3DSeg module should give you a start.

e.g. this model: Release 3D Slicer MONAI Auto3DSeg models · lassoan/SlicerMONAIAuto3DSeg · GitHub