Effectiveness of abdominal compression during helical renal CT
E M Caoili1, R H Cohan, M Korobkin
1Department of Radiology, University of Michigan Medical Center, Ann Arbor 48109-9723, USA.
Academic Radiology
|November 28, 2001
Summary
Abdominal compression during helical computed tomography (CT) enhances renal collecting system distention and opacification. Scanning at 300 seconds post-injection with compression yields better results than earlier scans or no compression.
Area of Science:
- Radiology
- Medical Imaging
- Uroradiology
Background:
- Helical computed tomography (CT) is crucial for visualizing the renal collecting system.
- Optimizing contrast opacification and distention is key for accurate diagnosis.
Purpose of the Study:
- To evaluate the impact of abdominal compression on renal collecting system opacification and distention during helical CT.
- To determine optimal scanning timing with compression.
Main Methods:
- Helical CT was performed on 31 patients with abdominal compression, scanned at 150 and 300 seconds post-contrast.
- A control group of 29 patients underwent CT without compression at 300 seconds.
- Renal collecting system opacification and distention (maximal short-axis diameter) were assessed.
Main Results:
- Abdominal compression significantly increased renal collecting system distention at 300 seconds compared to no compression (P = .0013).
- Scanning at 300 seconds with compression showed significantly greater distention than at 150 seconds (P = .0001).
- Consistent opacification was observed in most compressed scans at 300 seconds.
Conclusions:
- Abdominal compression during renal helical CT effectively increases collecting system distention.
- For enhanced distention and opacification, scanning at 300 seconds with compression is recommended over 150 seconds or no compression.
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