Magnetic resonance imaging following unilateral occlusion of the renal circulation in rabbits.

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Abstract
Magnetic resonance studies at 0.12 T [relaxation rate] were performed following acute unilateral occlusion of the renal artery or vein in rabbits. Prior to occlusion, in vivo and in vitro relaxation times of the renal cortex and outer medulla were similar. After venous occlusion, T1 [longitudinal relaxation rate] and T2 [transverse relaxation rate] were prolonged on the occluded side, while the contralateral side remained unchanged. After arterial occlusion, the outer medulla of both the occluded and contralateral kidney exhibited prolonged relaxation times. There was a significant linear correlation between T1, T2 and the H2O content of the tissue. Quantitative in vivo relaxation times may eventually prove to be useful in diagnosis, although at present they are less reliable than those obtained in vitro.

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