title: High-resolution CT using multidetector CT equipment: evaluation of image quality in 11 cadaveric lungs and a phantom.
abstract: OBJECTIVE
  The aim of this study was to evaluate the image quality and diagnostic efficacy of multidetector high-resolution CT (HRCT) by comparing it with single-detector HRCT and by comparing the noise and artifact of multidetector HRCT images with a phantom.
  
  
  METHODS
  Multidetector HRCT with six parameters and single-detector HRCT were performed on cadaveric lungs. The image quality and diagnostic efficacy of multidetector HRCT were evaluated in comparison with those of single-detector HRCT. A phantom was scanned, and image artifact and noise were investigated.
  
  
  RESULTS
  . The image quality of multidetector HRCT with axial 1.25 mm x 4i (four images per gantry rotation) mode was equal to that of single-detector HRCT. The image quality of multidetector HRCT with other modes was worse than that on single-detector HRCT. The diagnostic efficacy of multidetector HRCT with high-quality mode (pitch, 3:1) and axial mode was equal to that of single-detector HRCT. The diagnostic efficacy on multidetector HRCT with high-speed mode (pitch, 6:1) was worse than that on single-detector HRCT. In the phantom study, images made in high-speed mode had strong artifacts. Noise in the axial mode was milder than that in high-speed mode but more severe than that in high-quality mode.
  
  
  CONCLUSIONS
  The image quality of axial HRCT with multidetector CT is equal to that on single-detector HRCT. Axial HRCT with multidetector CT is appropriate for evaluating subtle lung abnormalities, but high-speed mode is unsuitable. Using the high-quality mode degrades image quality but is still worthwhile.
authors.affiliation: Department of Radiology, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
authors.forename: O
authors.initials: O
authors.lastname: Honda
authors.forename: T
authors.initials: T
authors.lastname: Johkoh
authors.forename: N
authors.initials: N
authors.lastname: Tomiyama
authors.forename: T
authors.initials: T
authors.lastname: Kozuka
authors.forename: N
authors.initials: N
authors.lastname: Mihara
authors.forename: M
authors.initials: M
authors.lastname: Koyama
authors.forename: S
authors.initials: S
authors.lastname: Hamada
authors.forename: H
authors.initials: H
authors.lastname: Naito
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Kudo
mesh_terms: D002102:Cadaver; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D019047:Phantoms, Imaging; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*