Figure 2

Sonographical data. Sonographical documentation method for examination of the pelvic floor in analogon to the usual used MR nomenclature [36, 37]. Shown is the filtered US data set: (a) axial, (left side: not filtered to show the enhancement induced by filtering) (b) sagittal and (c) coronal plane through the anal canal. A: the internal anal sphincter muscle; B: the external anal sphincter muscle (levator ani muscle); C: anal canal mucosa; D: rectum.