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Gastrointestinal Imaging |
1 From the Department of Radiology, Duke University Medical Center, Erwin Rd, Box 3808, Durham, NC 27710. Received June 19, 2000; revision requested July 12; revision received August 17; accepted September 1. Address correspondence to E.K.P. (e-mail: pauls003@mc.duke.edu).
PURPOSE: To compare image quality on transverse source images and coronal and sagittal reformations to determine the feasibility of using single–breath-hold three-dimensional liver computed tomography (CT) with multi–detector row helical CT in patients suspected of having hepatic metastases.
MATERIALS AND METHODS: Fifty-three patients underwent the protocol. Coronal and sagittal reformations were constructed. Images were reviewed for duration of scan acquisition and length and adequacy of z-axis coverage. Reformations were scored for visualization of portal and hepatic vein branches, liver edge sharpness, cardiac pulsation and respiratory motion artifacts, noise due to mottle, and overall impression.
RESULTS: Mean z-axis coverage was 207 mm ± 33 (SD) (range, 145–280 mm), with a mean acquisition time of 10.96 seconds ± 1.78 (range, 7.73–14.93 seconds). In 44 (83%) patients, the entire liver was imaged on a single helical scan. Artifact from cardiac motion was not identified on the transverse source images in any patient but was identified on coronal images in eight (15%) and on sagittal images in seven (13%). Similarly, noise due to mottle was not identified on the transverse source images but was identified on coronal images in seven (13%) patients and on sagittal images in six (11%).
CONCLUSION: It is feasible to perform single–breath-hold three-dimensional liver CT with multi–detector row helical CT technology. Reformations provide a unique perspective with which to view the liver and may improve diagnostic capacity.
Index terms: Computed tomography (CT), helical, 761.12115 • Computed tomography (CT), image quality • Computed tomography (CT), technology • Computed tomography (CT), three-dimensional, 761.12117 • Liver, CT, 761.12112, 761.12115, 761.12117 • Liver neoplasms, metastases, 761.33
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