Related Experiment Videos
Assessment of renal function with computed tomographic densitometry measurements
J F Platt1, J H Ellis, K A Reige
1Department of Radiology, University of Michigan Hospital, Ann Arbor 48109-0030, USA.
Academic Radiology
|September 1, 1996
Summary
Renal computed tomographic (CT) densitometry, particularly the cortex-to-aorta ratio (KAR), can identify normal kidney function. However, it has a high false-negative rate for detecting diminished renal function.
Area of Science:
- Radiology
- Nephrology
- Medical Imaging
Background:
- Renal function assessment is crucial in clinical practice.
- Computed tomography (CT) offers detailed anatomical visualization.
- Non-invasive methods for evaluating renal function are of significant interest.
Purpose of the Study:
- To evaluate the correlation between renal computed tomographic (CT) densitometry parameters and renal function.
- To determine the utility of CT densitometry in differentiating normal from abnormal renal function.
Main Methods:
- Three hundred seventy-three patients underwent abdominal helical CT scans.
- Renal CT densitometry parameters, including the cortex-to-aorta ratio (KAR), were calculated.
- These parameters were compared with serum creatinine and creatinine clearance (CrCl) measurements.
Main Results:
- Significant differences in KAR, KVP, and KWP were observed between patients with normal and abnormal renal function (p < .01).
- KAR demonstrated the strongest correlation with CrCl and was an independent predictor of renal function.
- A KAR threshold of less than 1 showed 96% specificity for predicting renal dysfunction.
Conclusions:
- Renal densitometry analysis, specifically KAR, can effectively depict patients with normal renal function.
- The method exhibits a high false-negative rate in identifying patients with diminished renal function.
- CT parameters derived at 90 seconds post-contrast were more informative than those at 30 seconds.