FIGURE 2.

Three methods for dividing stomach into proximal and distal portions. (A) Illustration of how computer-generated regions of interest (ROIs) for proximal and distal stomach (solid line) were defined by dividing stomach at one-half the distance along long axis of stomach (dotted line). (B) Illustration of how computer-generated ROIs were defined by selecting equal one-third divisions along long axis of stomach. (C) Stomach incisura angularis is site of formation of acute angle on lesser curvature (arrow) to form localized “notch.” Location of incisura varies depending on degree of gastric distension; therefore, consistent localization is difficult.