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Fig. 1. —29-year-old healthy male volunteer. Contrast-enhanced 3D MR
angiogram shows signal intensity measurements. Regions of interest are set in
five different anatomic regions to measure signal intensities in 1, pulmonary
trunk; 2, pulmonary parenchyma; 3, left atrium; 4, aorta; and 5, inferior vena
cava. Repeated measurements in consecutive 3D slabs in identical locations
provide time-course data of signal intensity changes.
