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  • Title: A simple technique for measuring relative renal blood flow.
    Author: Shames DM, Korobkin M.
    Journal: J Nucl Med; 1976 Oct; 17(10):876-9. PubMed ID: 966054.
    Abstract:
    To determine whether externally monitored early renal uptake of 131I-hippurate is proportional to renal blood flow, the renal uptake of 131I-hippurate at 1--2 min after injection was compared with the renal accumulation of radioactive carbonized microspheres in dogs. A renal artery catheter equipped with a balloon was used to decrease renal blood flow unilaterally. One minute after the intravenous injection of 100 muCi of 131I-hippurate, about 1 muCi of either 85Sr- or 98Nb-labeled carbon microspheres was injected into the left ventricle. Radioactivity was measured over both kidneys. The total radioactivity within each kidney region of interest was corrected for background and integrated over the 1--2 min after injection. Thirteen measurements of relative renal blood flow were made for seven dogs. The dogs were then killed and both kidneys were excised and counted for the radioactivity of the microspheres. The 1--2-min relative renal uptake of 131I-hippurate correlated well with relative microsphere uptake, suggesting that relative renal blood flow can be simply determined from the external measurement of renal uptake of 131I-hippurate.
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