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Figure 1. Normal esophageal study. To assess esophageal transit, ROIs are drawn over the proximal, middle and distal thirds of the esophagus avoiding the stomach (arrow) and hypopharynx (E). Time activity curves (TACs) are generated for the three esophageal segments. The transit or emptying times for the individual segments are calculated as the time from peak to 10% of peak (A,B,C). The RF4 is the residual fraction remaining in the esohagus after 4 swallows and is calculated from a TAC generated from a ROI placed around the entire esophagus (D).

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