Fig. 5.

A representative 3D reconstruction of the stomach from the MRI data shown in Fig. 1. Four virtual MR images are generated along arbitrary slicing planes. A: edge contours of the stomach in virtual and original image planes. Gray and black colors represent intragastric liquid and air region. Thicker lines represent contours on virtual images and thinner lines contours on original images. The light gray and black spheres show the seed points within the contours for liquid (bright) and air (dark), respectively. B: following segmentation of the original 2D MR images, 3D geometry of both liquid and air in the stomach and an envelope encompassing both were reconstructed. The black line indicates the positioning of a silicon catheter assembly inserted through the lower esophageal sphincter with its balloon tip at the liquid-air interface.