Figure 2a. Thin-slab maximum intensity projections from the CT angiography data set obtained in the patient with advanced peripheral vascular disease show two of the 25 anatomic targets used in this study. (a) Thirty-voxel-thick anteroposterior view centered on origin of right anterior tibial artery (three-section extent). (b) Eighty-eight-voxel-thick view midway between anteroposterior and left-right views centered on point of left superficial femoral artery occlusion (four-section extent). Note that readers were asked to find anatomic targets by navigating through transverse image stacks and did not see these or any other type of processed views. The vascular targets are circled in yellow, and the range of acceptable transverse sections is located between the red lines.