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. 2022 Jan 30;28(1):131–144. doi: 10.5056/jnm21020

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© 2022 The Korean Society of Neurogastroenterology and Motility

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Intraluminal ultrasound (US) and impedance parameters in a healthy subject. (A) The impedance value 5 cm proximal to the lower esophageal sphincter and M-mode US images temporally correlated to obtain baseline and nadir impedance values. The swallow-to-distension interval and distension duration were calculated using M-mode images. The B-mode images for analyzing US parameters were selected using M-mode images (curved arrows a, b, and c). (B) The baseline/contraction/distension muscle thickness, muscle cross-sectional area, and lumen cross-sectional area were analyzed using the corresponding B-mode US images.