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Fig. 1B —Dynamic images of 3-month-old boy referred for mild bilateral hydronephrosis. This patient had renal transit times of 1 min 37 sec on the left and 3 min 30 sec on the right, with slight delay on right still being within normal limits. Split renal function was calculated to be 49% on left and 51% on right. Images A-C show maximum intensity projections derived from volumes corresponding to three separate time points, whereas D-F show same slice from each of the three data sets. A and D show vascular or cortical phase. B and E were acquired 1 min 45 sec after vascular phase and show homogeneous enhancement of cortex and medulla. C and F were acquired 3 min 30 sec after vascular phase and show enhancement of calyces and ureters of both kidneys.