Fig. 2

Schematic diagram of joint surface segmentation. a, c are MRI drawings of sacroiliac joints in normal patients, a is the original diagram of T1WI and the schematic diagram of articular surface segmentation, c diagram is the original diagram and articular surface segmentation diagram of T2WI; b, d are MRI drawings of sacroiliac joint structural injury, b is the original diagram of T1WI and the schematic diagram of articular surface segmentation, and d diagram is the original diagram and articular surface segmentation diagram of T2WI