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Fig. 2A —Relative signal-versus-time curves for 3-month-old boy shown
in Figures 1A,
1B,
1C,
1D,
1E, and
1F. Graphs show signal from
calyces (A) and salient features of curves (B). Specifically,
note vascular peak in cortex (VASC), cortical distal convoluted tubular (DT)
peak, and peak caused by contrast material in loop of Henle (LH) in medulla.
Calyces show slight early signal enhancement, which is probably due to either
contrast material in vessels running over surface of calyces or partial volume
effects. Relative signals from cortex and medulla can be seen to fall in
linear range of phantom data shown in
Figure 3, whereas those from
calyces are in nonlinear range. Hence, relative signal levels in calyces are
somewhat underestimated and form of calyceal curves will be distorted.
