title: Usefulness of the application of the BLADE technique to reduce motion artifacts on navigation-triggered prospective acquisition correction (PACE) T2-weighted MRI (T2WI) of the liver.
abstract: OBJECTIVE
  To evaluate the effects of the application of the BLADE (Siemens, Siemens Medical Systems, Erlangen, Germany) technique, a technique to reduce motion artifacts, on navigator-triggered prospective acquisition correction (PACE) T2-weighted MRI (T2WI) of the liver.
  
  
  METHODS
  Twenty-three consecutive patients with a total of 57 localized hepatic diseases (39 malignant, 18 benign) and 57 patients without hepatic lesion underwent MR study during eupnea. The images were assessed quantitatively by calculating the liver-lesion contrast. Two subjective analyses were also performed. Two observers independently assessed the image quality and the confidence level of the detection and characterization of hepatic nodules using a five-point scale. Statistical analysis was performed with the Wilcoxon matched-pairs test except for the diagnostic performance evaluated with jackknife alternative free-response receiver operating characteristic (JAFROC) analysis.
  
  
  RESULTS
  There was no significant difference in the mean liver-lesion contrast between the PACE T2WI with BLADE (T2WI-BLADE) (mean +/- SD = 0.29 +/- 0.14) and that without BLADE (0.30 +/- 0.14) (P = 0.39). Visual assessment of PACE T2WI-BLADE (4.8 +/- 0.47) was superior to that without BLADE (4.3 +/- 0.8) (P < 0.0001), although there were no significant differences in detecting and characterizing hepatic lesions using JAFROC analysis.
  
  
  CONCLUSIONS
  The BLADE technique could improve image quality by reducing motion artifacts on hepatic MRI without affecting the diagnostic performance.
authors.affiliation: Department of Radiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan. snankou2002@yahoo.co.jp
authors.forename: Sumire
authors.initials: S
authors.lastname: Nanko
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Oshima
authors.forename: Takeshi
authors.initials: T
authors.lastname: Watanabe
authors.forename: Shigeru
authors.initials: S
authors.lastname: Sasaki
authors.forename: Masaki
authors.initials: M
authors.lastname: Hara
authors.forename: Yuta
authors.initials: Y
authors.lastname: Shibamoto
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016477:Artifacts; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted; D008107:Liver Diseases / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009068:Movement; D018709:Statistics, Nonparametric