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ROC curve of rectal gas volume, maximal rectal gas area, and area of rectal gas (vertical) on the 2-dimensional abdominal film (scout) to identify a rectal evacuation disorder. Note the two approaches have similar performance characteristics. RGV, rectal gas volume; MRGTA, maximum rectal gas transaxial area; RGA on scout, area of rectal gas on the 2-dimensional abdominal film (scout)
