title: Radial volumetric imaging breath-hold examination (VIBE) with k-space weighted image contrast (KWIC) for dynamic gadoxetic acid (Gd-EOB-DTPA)-enhanced MRI of the liver: advantages over Cartesian VIBE in the arterial phase.
abstract: OBJECTIVE
  To compare radial volumetric imaging breath-hold examination with k-space weighted image contrast reconstruction (r-VIBE-KWIC) to Cartesian VIBE (c-VIBE) in arterial phase dynamic gadoxetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (DCE-MRI) of the liver.
  
  
  METHODS
  We reviewed 53 consecutive DCE-MRI studies performed on a 3-T unit using c-VIBE and 53 consecutive cases performed using r-VIBE-KWIC with full-frame image subset (r-VIBEfull) and sub-frame image subsets (r-VIBEsub; temporal resolution, 2.5-3 s). All arterial phase images were scored by two readers on: (1) contrast-enhancement ratio (CER) in the abdominal aorta; (2) scan timing; (3) artefacts; (4) visualisation of the common, right, and left hepatic arteries.
  
  
  RESULTS
  Mean abdominal aortic CERs for c-VIBE, r-VIBEfull, and r-VIBEsub were 3.2, 4.3 and 6.5, respectively. There were significant differences between each group (P < 0.0001). The mean score for c-VIBE was significantly lower than that for r-VIBEfull and r-VIBEsub in all factors except for visualisation of the common hepatic artery (P < 0.05). The mean score of all factors except for scan timing for r-VIBEsub was not significantly different from that for r-VIBEfull.
  
  
  CONCLUSIONS
  Radial VIBE-KWIC provides higher image quality than c-VIBE, and r-VIBEsub features high temporal resolution without image degradation in arterial phase DCE-MRI.
  
  
  CONCLUSIONS
  Radial VIBE-KWIC minimised artefact and produced high-quality and high-temporal-resolution images. Maximum abdominal aortic enhancement was observed on sub-frame images of r-VIBE-KWIC. Using r-VIBE-KWIC, optimal arterial phase images were obtained in over 90 %. Using r-VIBE-KWIC, visualisation of the hepatic arteries was improved. A two-reader study revealed r-VIBE-KWIC's advantages over Cartesian VIBE.
authors.affiliation: Department of Radiology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan, fujinaga@shinshu-u.ac.jp.
authors.forename: Yasunari
authors.initials: Y
authors.lastname: Fujinaga
authors.forename: Ayumi
authors.initials: A
authors.lastname: Ohya
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Tokoro
authors.forename: Akira
authors.initials: A
authors.lastname: Yamada
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ueda
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ueda
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kitou
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Adachi
authors.forename: Aya
authors.initials: A
authors.lastname: Shiobara
authors.forename: Naomichi
authors.initials: N
authors.lastname: Tamaru
authors.forename: Marcel D
authors.initials: MD
authors.lastname: Nickel
authors.forename: Katsuya
authors.initials: K
authors.lastname: Maruyama
authors.forename: Masumi
authors.initials: M
authors.lastname: Kadoya
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001012:Aorta, Abdominal / Q000473:pathology; D016477:Artifacts; D062485:Breath Holding; D003287:Contrast Media; D016208:Databases, Factual; D005260:Female; D019786:Gadolinium DTPA; D006499:Hepatic Artery / Q000473:pathology; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D007091:Image Processing, Computer-Assisted; D008099:Liver / Q000098:blood supply / Q000473:pathology*; D008107:Liver Diseases / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000473:pathology; D012189:Retrospective Studies
chemical_list: D003287:Contrast Media; C073590:gadolinium ethoxybenzyl DTPA; D019786:Gadolinium DTPA