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Fig. 1. —Illustration shows basic principles of maximum-intensity-projection (MIP) imaging. Four axial thin-section images contain segments of obliquely oriented vessel (black shapes). Small nodule (in third axial image, white dot) of diameter similar to visible vessel portions is also present. MIP image, or slab, combines these four axial images so that vessel is seen in its entirety, distinct from nodule, and nodule conspicuity is enhanced.