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. Author manuscript; available in PMC: 2014 Aug 25.
Published in final edited form as: Gastrointest Endosc. 2010 Jun 25;72(3):587–592. doi: 10.1016/j.gie.2010.04.029

Figure 1.

Figure 1

A, Representative fluoroscopic image of cervical vertebrae (1–7) used as a stationary point of reference for placing 0.5-cm intervals above and below the UES-pharyngeal junction. UES, upper esophageal sphincter; US-MP, US miniprobe. B, Hyperechoic artifacts abruptly appear when the transducer of the US-MP is positioned at the level of the UES-pharyngeal junction during station pull through. This image demonstrates the air-tissue interface where air artifacts are first noted anterior to the flat-shaped muscle.