Fig. 9

The flowchart of the proposed method. a is the original MRI image sequence. The object detection model based on the SSD algorithm is used to detect the ROI (uterus and tumor) (b). c is the optimal image that can clearly see the ROI. d is the cropped image, which only includes ROI. The semantic segmentation model based on Attention U-net is used to accurately predict the uterus (light blue region) and tumor (red region) of the cropped image e. f is the ellipse fitting algorithm that is used to generate UCL, and the R in (i) is the final prediction of the depth of MI