Publications [#268867] of G. Allan Johnson

Papers Published
  1. Jaffe, TA; Nelson, RC; Johnson, GA; Lee, ER; Yoshizumi, TT; Lowry, CR; Bullard, AB; DeLong, DM; Paulson, EK, Optimization of multiplanar reformations from isotropic data sets acquired with 16-detector row helical CT scanner., Radiology, vol. 238 no. 1 (January, 2006), pp. 292-299 [16373774], [doi] .

    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.