MR data with aligned sonographical data. Shown are the corresponding MR data set of the pelvic floor to the US data set from Fig. 2. (a) shows the axial plane from the axial data set; (b) and (c) show the sagittal respectively coronal plane from the corresponding sagittal data set. (c) is shown only for illustration purposes due to the poor resolution. On the right side the original MR data set is shown and on the left side a cutout with the corresponding initial alignment. The capital letters indicate anatomical structures: A: anal region; B: bladder; C: coccyx; F: ischial tuberosity; L: lumbar vertebrae; S: symphysis; V: vaginal region.