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Optimization of Multiplanar Reformations from Isotropic Data Sets Acquired with 16–Detector Row Helical CT Scanner¹

¹ From the Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710. Received March 10, 2005; revision requested April 29; revision received June 22; accepted June 27; final version accepted July 8. Address correspondence to T.A.J. (e-mail: jaffe002{at}mc.duke.edu).

Institutional review board approval and waiver of consent were obtained for the patient component of this retrospective HIPAA-compliant study. By using an anthropomorphic phantom and metal oxide semiconductor field effect transistor detectors, radiation dose was determined for one eight–detector row and two 16–detector row computed tomographic (CT) protocols. A custom phantom was scanned by using the three protocols to identify isotropy. Contrast-to-noise ratios (CNRs) were determined for the same protocols by using a third phantom. Seven patients had undergone isotropic 16–detector row CT of the abdomen and pelvis. Anonymized coronal reformations at various thicknesses were ranked qualitatively by three radiologists. Effective dose equivalents were similar for the eight– and 16–detector row protocols. When transverse and coronal reformations of data acquired in the custom phantom were compared, coronal reformations obtained with the 16–detector row and 0.625-mm section thickness protocol were found to be nearly identical to the transverse image for all sets of line pairs. CNRs were consistently highest on 5-mm-thick coronal reformations (CNR range, 1.2–3.3). For qualitative assessment, 2- and 3-mm-thick coronal reformations were consistently preferred.

© RSNA, 2006

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