Radiology, Vol 190, 371-378, Copyright © 1994 by Radiological Society of North America

ARTICLES

Renal artery blood flow: quantitation with phase-contrast MR imaging with and without breath holding

JF Debatin, RH Ting, H Wegmuller, FG Sommer, JO Fredrickson, TJ Brosnan, BS Bowman, BD Myers, RJ Herfkens and NJ Pelc
Department of Radiology, Stanford University School of Medicine, Calif.

PURPOSE: To compare the accuracy of 16-frame cine phase-contrast (PC) magnetic resonance (MR) imaging with those of two breath-hold PC techniques in the measurement of renal artery blood flow. MATERIALS AND METHODS: In vitro flow measurements were performed in a segment of harvested human artery embedded in gel. For the cine PC acquisition, respiratory motion was simulated. In eight subjects with recently obtained para-amino-hippurate-clearance renal blood flow data, renal artery flow measurements were subsequently performed with two breath- hold imaging techniques and with cine PC imaging during shallow respiration. RESULTS: Breath-hold sequences were significantly more accurate than conventional cine PC sequences both in vitro (P < .005) and in vivo (P < .05). Cine PC imaging tended to overestimate flow (in vivo mean, 24.47% +/- 9.94), reflecting artifactual enlargement of the apparent vessel size. CONCLUSION: Reliable blood flow measurements in the renal artery are possible with breath-hold PC MR imaging.

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