[Determination of differential renal function using 99m Tc-DMSA scintigraphy].

Area of Science:

• Nuclear Medicine
• Radiology
• Urology

Background:

• Accurate assessment of separate renal function is crucial for diagnosing and managing various kidney conditions.
• Static scintigraphy is a common imaging technique, but its accuracy can be affected by factors like patient positioning and radiation absorption.

Purpose of the Study:

• To evaluate the accuracy of 99mTc-DMSA static scintigraphy for assessing separate renal function.
• To determine the necessity of correcting for differential gamma radiation absorption between the left and right kidneys.
• To investigate the influence of patient position and examination timing on the results.

Main Methods:

• Examination of 331 patients using 99mTc-DMSA static scintigraphy.
• Analysis of data from patients with varying kidney positions.
• Comparison of results with and without correction for gamma radiation absorption.

Main Results:

• Static scintigraphy is confirmed as an accurate method for assessing separate renal function.
• Correction for differential gamma radiation absorption is essential for accurate results, particularly in cases of asymmetric kidney positions.
• Examination in a vertical position is preferable for assessing relative kidney function.
• Results are generally unaffected by examination timing (2-4 hours post-injection), except in severe obstructive uropathy.
• Excellent reproducibility was observed in repeated examinations and evaluations.

Conclusions:

• 99mTc-DMSA static scintigraphy provides accurate separate renal function assessment.
• Implementing corrections for gamma radiation absorption is critical for reliable clinical interpretation.
• Standardized patient positioning (vertical) and appropriate timing enhance the reliability of relative renal function assessment.