Original article Evaluation of gamma camera-based measurement of individual kidney function using iodine-123 orthoiodohippurate

Abstract. Gamma camera-based clearance techniques which use the renal uptake ratio (RUR) of the radiotracer are available to estimate the effective renal plasma flow (ERPF) and glomerular filtration rate. To evaluate the accuracy of these techniques, we measured RUR by an optimized procedure and compared it with standard ER-PF. Iodine-123 orthoiodohippurate (OIH) scintigraphy and simultaneous para-aminohippurate cl arance study for measuring standard ERPF were performed in three hospitals in 24 patients with normal or mildly impaired renal function. 123I-OIH was injected intravenously and 10-s consecutive imaging of the kidneys was started when the abdominal aorta was seen. The attenuation co-efficient for 123 [ was measured in each hospital using the same water-equivalent absorption materials and used fo