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. Author manuscript; available in PMC: 2009 Sep 1.
Published in final edited form as: Gastroenterol Clin North Am. 2008 Sep;37(3):493–vii. doi: 10.1016/j.gtc.2008.06.003

Figure 8.

Figure 8

Ultrasound images of the anal canal obtained from the 3D-US volume: cross-sectional (axial) images along the length of anal canal in a nulliparous subject. In this example the anal sphincter complex is shown at every 1 mm distance using I-Slice function of HD-11 (Philips). Marked in the figure are the IAS (black circle) and the EAS (white outer ring) are smooth, uniform and symmetrical. Obtained from author