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Differentiating pelvic veins and enlarged lymph nodes: optimal CT techniques
S A Teefey1, R L Baron, S J Schulte
1Department of Radiology, University of Washington School of Medicine, Seattle Veterans Administration Medical Center 98105.
Radiology
|June 1, 1990
Summary
Delayed computed tomographic (CT) scanning of the pelvis optimizes contrast enhancement of pelvic veins. This technique improves differentiation of pelvic veins and lymph nodes in patients with suspected malignancies.
Area of Science:
- Radiology
- Medical Imaging
Background:
- Accurate differentiation of pelvic veins and lymph nodes is crucial for diagnosing pelvic malignancies.
- Computed tomography (CT) is a key imaging modality for pelvic evaluations.
Purpose of the Study:
- To determine the optimal intravenous contrast administration technique for enhancing pelvic veins and lymph nodes on CT scans.
- To evaluate the timing of peak venous enhancement in the pelvis.
Main Methods:
- Seventy-eight patients with suspected pelvic malignancies underwent CT scans.
- A two-phase bolus injection of 150 mL contrast material was administered.
- Pelvic CT images were acquired at 1.5, 3, 5, and 7 minutes post-injection.
Main Results:
- Mean pelvic venous enhancement peaked between 3 and 7 minutes after contrast initiation.
- Diabetic patients exhibited significantly reduced venous enhancement.
- Peak enhancement occurred from 3 to 7 minutes, suggesting a delayed scanning window.
Conclusions:
- A delayed CT scanning protocol for the pelvis is recommended for optimal pelvic vein enhancement.
- This technique may improve the detection and characterization of pelvic abnormalities, including malignancies.