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Fig. 1B. —Sliding thin-slab maximum-intensity-projection (MIP) images of 63-year-old man who underwent CT angiography of pulmonary arteries twice. 90 mL high-concentration contrast media (400 mg I/mL). Note increased enhancement of the left main pulmonary artery (long arrow) and more uniform visualization of lateral and anterior subsegmental artery of anterior segmental artery of left upper lobe (short arrows) in B. Sliding thin slab MIP images were obtained for illustration only; within-study assessment of peripheral arteries was performed on axial images. Thickness of slab, window width, and window center were identical in both images. Enhancement of main pulmonary arteries was 213 H in A and 340 H in B.