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Radiology, Vol 194, 83-90, Copyright © 1995 by Radiological Society of North America

ARTICLES

Helical CT during arterial portography: optimization of contrast enhancement and scanning parameters

PC Freeny, HV Nghiem and TC Winter
Department of Radiology SB-05, University of Washington School of Medicine, Seattle 98195.

PURPOSE: To determine the optimal scanning parameters for helical computed tomography during arterial portography (CTAP) of the liver. MATERIALS AND METHODS: Single- and double-helix CTAP were performed in 11 and 20 adult patients, respectively, with 200 mL of contrast material (300 mg of iodine per milliliter) injected at a rate of 3 mL/sec via the superior mesenteric artery. Scanning delays were adjusted for single-helix CTAP so the last scan was obtained at 66 seconds. Delays were adjusted for double-helix CTAP so the last scan during the first helix (CTAP-1) was obtained 10 seconds before the end of the injection at 56 seconds and the first scan during the second helix (CTAP-2) was obtained at the end of the injection at 66 seconds. RESULTS: Single-helix CTAP scans were of poor quality owing to multiple perfusion abnormalities. Lesion detection for double-helix CTAP-1 was 93.2% and was 100% for CTAP-2, and CTAP-2 scans had significantly fewer perfusion abnormalities. CONCLUSION: A scanning delay of 60-66 seconds appears to be optimal. The CTAP-1 scans showed no useful information and need not be acquired.


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R. C. Semelka, W. G. Cance, H. B. Marcos, and M. A. Mauro
Liver Metastases: Comparison of Current MR Techniques and Spiral CT during Arterial Portography for Detection in 20 Surgically Staged Cases
Radiology, October 1, 1999; 213(1): 86 - 91.
[Abstract] [Full Text]


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