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Gadolinium-enhanced MR imaging of normal renal transplants. An evaluation of a T1-weighted dynamic echo-planar
B Dupas1, T Bach-Gansmo, G Blancho
1Department of Radiology, Centre Hospitalier Universitaire, Nantes, France.
Purpose:
To evaluate the potential usefulness of dynamic MR with echoplanar imaging (EPI) in assessing the renal function in patients with renal allografts.
Material And Methods:
Using a T1-weighted sequence, EPI was performed after injection of a Gd-chelate in 17 patients with normally functioning renal allografts. Time-intensity curves were plotted from the signal intensity (SI) measurements of the cortex and the medulla.
Results:
The pattern of corticomedullar differentiation (CMD) observed after contrast enhancement was divided into four phases using the T1-EPI. After a rapid decrease in the SI of cortical structures, and a subsequent return to precontrast levels, a gradual fall in the SI of the medulla was observed. The average time between the two periods of signal loss was 60 s.
Conclusion:
This study illustrated the potential use of dynamic T1-EPI to demonstrate contrast-induced CMD in renal allografts.