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Fig. 2. —Changes of average signal-to-noise ratios of vascular and background tissues at different phases on subtracted time-resolved three-dimensional MR angiograms in 28 patients in whom arterial phase images were obtained in third data set. In third data set of arterial phase, strong arterial enhancement and suppressed venous enhancement are seen. In fourth data set, signal-intensity differences between artery and vein rapidly decreased. In postcontrast data sets (from second to fifth data sets), signal intensity of fat is extremely decreased by subtraction. {diamondsuit} = aorta, {blacksquare} = right renal artery, {blacktriangleup} = left renal artery, x = inferior vena cava, asterisks = right renal vein, [UNK] = left renal vein, + = fat, horizontal lines = muscle.