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Background: Imaging of the lower esophageal sphincter in patients with achalasia using 7.5 and 12 MHz ultrasound transducers has shown variable results. Methods: A 20 MHz radial ultrasound transducer was used to quantitatively compare the lower esophageal sphincter in patients with achalasia to that of normal volunteers. The transducer, housed in a 6.2F catheter, was placed at the level of the lower...