Orthogonal Sections Display (OSD) is a flexible, generalpurpose 2D display package used to mix and match images from one or more volumetric data sets. Images can be displayed in a transverse, sagittal, or coronal orientation. Other options include magnification, zooming, window, and level. Image sequence can be prioritized by slice, phase, time, or file for movies. It can also simultaneously display pairs of slices from multiple files.

Oblique Sections Display (OBL) is used to extract slices at any arbitrary orientation within a volumetric data set. New data sets with slices parallel to a selected oblique angle can be generated after resampling and interpolation. Oblique sections can be shipped into shared memory to be used by other modules such as Region of Interest to make quantitative measurements. Features exist to help visualize where one oblique section intersects others. For example, any oblique section can be placed into a snapshot window with a line superimposed showing where a newly selected oblique intersects this slice. This module can be used, for instance, on a cardiac data set to resample and generate slices that are perpendicular to the true short axis of the heart.

Volume Render (VR) is used for 3D visualization of structures such as the heart, lungs, and vasculature. The 3D effect is produced by projecting rays from multiple angles of view through the volumetric data set (Fig. 21). The rendered

FIGURE 21 Display of volume rendering in VIDA.



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