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Quantitation of renal function with technetium-99m MAG3
C D Russell1, B L Thorstad, M V Yester
1Division of Nuclear Medicine, University of Alabama Hospital, Birmingham 35233.
Summary
Technetium-99m mercaptoacetyltriglycine ([99mTc]MAG3) can replace iodine-131 hippuran ([131I]hippuran) in quantitative renal function protocols. This substitution offers improved image quality and reduced radiation exposure.
Area of Science:
- Nuclear Medicine
- Radiopharmacology
- Renal Physiology
Background:
- Iodine-131 hippuran ([131I]hippuran) has been a standard for quantitative renal function assessment.
- Technetium-99m mercaptoacetyltriglycine ([99mTc]MAG3) is a newer radiotracer with potential advantages.
Purpose of the Study:
- To compare the efficacy of [99mTc]MAG3 with [131I]hippuran in a quantitative renal function protocol.
- To evaluate the suitability of [99mTc]MAG3 for routine clinical use in renal imaging.
Main Methods:
- A quantitative renal function protocol was applied to 50 patients.
- Methods included estimation of effective renal plasma flow (ERPF) via plasma clearance.
- Relative renal function was determined from kidney count rates, and urine activity was compared to plasma disappearance.
Main Results:
- Results obtained with [99mTc]MAG3 showed good agreement with [131I]hippuran after minor formula modifications.
- The protocol demonstrated suitability for routine clinical application.
Conclusions:
- [99mTc]MAG3 is a viable substitute for [131I]hippuran in quantitative renal function protocols.
- Substitution offers benefits of superior image quality and lower radiation dose, particularly in patients with abnormal renal function.