Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A: B-mode ultrasound (US) image of the esophagus and manually drawn markings to measure cross-sectional area (CSA) of the CM and LM layers. B: esophageal M-mode ultrasound image 6 cm above the LES with manually drawn markings for the CM, LM, and septum during peristalsis and transient LES relaxation (TLESR).
