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Fig. 1C. —66-year-old man with right ureteropelvic junction obstruction. Graph of whole-kidney renographic curve (C) generated from dynamic T1-weighted gradient-echo MR renographic image (21.9/4.2; flip angle, 60°) with whole-kidney ROI (D), including dilated renal pelvis, shows obstructive pattern with increasing contrast material accumulation in right kidney consistent with ureteropelvic junction obstruction. Split renal function per unit volume was 47% for right kidney (, C) and 53% for left kidney (, C). Volume-corrected split renal function was 39% for right kidney and 61% for left kidney. Reduced overall right renal function was due to reduction in right kidney bulk rather than to renal impairment.