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Figure 5


Fig. 4B —61-year-old man with abdominal aortic aneurysm. Anterior volume-rendered CT angiogram (A) and maximum-intensity-projection image (B) obtained with 50-mL protocol show good delineation of entire aorta and aortic branches. These images also show drop of arterial enhancement in distal iliac vasculature. Mean aortoiliac attenuation was 309 H, and difference between maximum and minimum attenuation values along z-axis was 76 H. Attenuation of each region of interest (ROI) was 326, 326, 322, 321, 310, 313, 246 H, respectively, for ROIs 1, 2, 3, 4, 5, 6, and 7.