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Fig. 13 —Progression from 2D imaging to 3D narrow-angle (NA) to 3D full-volume (FV) imaging is shown with respective representative images. In 2D imaging, only single slice of data is acquired with result being 2D image with no depth. In 3D narrow-angle imaging, entire heart volume is not obtained; rather, 3D slice of varying width, depending on resolution, is obtained and simultaneous volume rendering adds depth not seen with 2D slice. Finally, for 3D full-volume imaging, example shows that although entire volume of heart is captured, exact same volume-rendered slice shown in 3D narrow-angle imaging can be extracted from larger volume data set resulting in identical image. (Illustration by Richard Gersony)