High‐frequency ultrasound imaging of the anal sphincter muscles in normal subjects and patients with fecal incontinence

The current "gold standard" to diagnose anal sphincter morphology and disruptions utilizes low-frequency (3-9 MHz) ultrasound (US) imaging techniques that provide a general outline of the sphincter muscles, but not their microstructural details. High-frequency US transducers (7-15 MHz) have been used to study the muscle architecture (direction of muscle fascicles) in the limb muscle.The goal of our study was to visualize the microstructural...