Figure 5

Segmentation of the internal anal sphincter muscle. Segmentation of the internal anal sphincter muscle. (a) shows the original axial MR slice with the contour of the internal anal sphincter muscle in pink color, (b) the corresponding US slice with the contour in green color and (c) the registered image with the contour in blue color respectively. (d) shows the areas in comparision. The arrows indicate where the contour of the internal anal sphincter muscle is modified with the algorithm. The registration partially corrects the compression induced by the transducer (the upper arrow shows the position of the transducer).