Radiology, Vol 189, 395-400, Copyright © 1993 by Radiological Society of North America

ARTICLES

Routine helical CT of the abdomen: image quality considerations

RK Zeman, AS Zeiberg, WJ Davros, SM Ascher, CJ Cooper, DI Weltman, R Patt, BS Garra, DL Griego and PM Silverman
Department of Radiology, Georgetown University Medical Center, Washington, DC 20007.

PURPOSE: Both helical and nonhelical abdominal computed tomographic (CT) scans were obtained to compare image quality, study the effect of patient size and collimation, and compare the frequency of visualization of normal abdominal structures. MATERIALS AND METHODS: The study group consisted of 60 consecutive patients with clinically suspected metastatic malignancy. RESULTS: Both helical and nonhelical image quality was excellent, with equal mean image quality scores of 4.1 on a 5-point scale. In patients weighing more than 175 lb (79 kg), both helical and nonhelical image quality degraded equally when 5-mm collimation was used; 10-mm collimation resulted in excellent image quality, regardless of patient size. Small in-plane structures (eg, renal arteries, renal veins, pancreatic duct) were seen best on helical scans. With the addition of retrospectively reconstructed overlapping images, improvement in visualization of these structures was statistically significant. CONCLUSION: Helical CT scanning should be the preferred means of acquiring routine abdominal CT images.

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