Differential renal function estimation using computerized tomography based renal parenchymal volume measurement.

Area of Science:

• Radiology
• Urology
• Medical Imaging

Background:

• Nuclear renal scan is the standard for assessing differential renal function.
• Accurate assessment of renal function is crucial for managing kidney conditions.

Purpose of the Study:

• To evaluate helical computerized tomography (CT) as an efficient alternative to nuclear renal scan for determining differential renal function.
• To use renal parenchymal volume measured by CT as a surrogate marker for differential renal function.

Main Methods:

• 33 patients with chronic obstruction underwent both CT and nuclear renal scan.
• Renal parenchymal volume was measured using semiautomated boundary delineation with manual editing.
• Percent renal volume was calculated and compared with percent renal function from nuclear scans.

Main Results:

• A strong correlation (r=0.90) was observed between percent renal function and percent renal volume.
• High correlations were maintained in both contrast-enhanced (r=0.87) and nonenhanced (r=0.95) CT groups.
• Significant correlations were also found in subgroups with reduced renal function (e.g., r=0.76 for <40% function).

Conclusions:

• Differential renal volume measured by CT strongly correlates with differential renal function determined by nuclear renal scan.
• CT can serve as a single diagnostic tool for anatomical and functional assessment in suspected poorly functioning kidneys.
• Helical CT presents a more efficient approach for gaining renal function information.