title: Image quality of 320-detector row wide-volume computed tomography with diffuse lung diseases: comparison with 64-detector row helical CT.
abstract: OBJECTIVE
  To evaluate image quality of 320-detector row wide-volume (WV) computed tomography (CT) compared to 64-detector row helical CT from axial images and coronal multiplanar reformation (MPR).
  
  
  METHODS
  Thirty-five patients with diffuse lung diseases were scanned using both 320-detector row WV CT (coneXact and volumeXact+) and 64-detector row helical protocols. Three blinded observers evaluated dislocation and heterogeneity of normal structures on 3 MPR patterns (WV scan with coneXact, WV scan with volumeXact+, and helical scan) using a 3-point scale from 1 (severe dislocation/heterogeneity) to 3 (no dislocation/heterogeneity). They also evaluated axial images of 2 scan patterns (WV with volumeXact+ and helical) using a 5-point scale from 1 (nondiagnostic) to 5 (excellent). Statistical analyses were performed with a post hoc test, Wilcoxon signed rank test, Mann-Whitney U test, or the Kendall W test.
  
  
  RESULTS
  The WV scans with the coneXact algorithm had significantly lower quality scores than the WV scans with the volumeXact+ algorithm and the helical scans (P < 0.01) with MPR. Helical scans had significantly lower quality scores than the WV scans with volumeXact+ for heterogeneity on the mediastinal window setting with MPR (P < 0.01). There were no significant differences concerning total image quality of axial images between the WV scans with the volumeXact+ algorithm and the helical scans.
  
  
  CONCLUSIONS
  The overall image quality of WV scans with the volumeXact+ algorithm was almost comparable to that of the helical scans on the lung window setting, but density homogeneity with helical scans was inferior to that of the WV scans with the volumeXact+ algorithm on the mediastinal window setting with MPR.
authors.affiliation: Department of Radiology, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Honda
authors.forename: Daisuke
authors.initials: D
authors.lastname: Takenaka
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Matsuki
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Koyama
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Tomiyama
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Murata
authors.forename: Sadayuki
authors.initials: S
authors.lastname: Murayama
authors.forename: Satoshi
authors.initials: S
authors.lastname: Noma
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Moriya
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Ohno
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011857:Radiographic Image Interpretation, Computer-Assisted; D013902:Radiography, Thoracic / Q000379:methods; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed / Q000379:methods*