title: Diffusion-weighted imaging of the abdomen at 3 T: image quality comparison with 1.5-T magnet using 3 different imaging sequences.
abstract: OBJECTIVE
  This study aimed to perform comparisons between diffusion-weighted imaging (DWI) sequences at 3 T with 1.5 T.
  
  
  METHODS
  Thirteen healthy volunteers underwent abdominal DWI on both 3- and 1.5-T magnets using 3 sequences including breath hold without parallel imaging (PI), breath hold with PI, and free breathing with PI at b50 and b1000. Artifacts and subjective image quality scores, signal intensity, and apparent diffusion coefficient were compared.
  
  
  RESULTS
  For breath hold without PI, higher artifact was noted at 3 T b50 compared with 1.5 T (P < 0.0001). For b50 and b1000 breath hold with PI, artifacts were not different between the magnets, but image quality was better at 3 T (P = 0.04 and P = 0.02, respectively). For b50 and b1000 free breathing sequences, artifact and image quality scores were significantly better at 1.5 T. For breath hold acquisitions, the signal-to-noise ratio of gallbladder, kidneys, and pancreas was generally higher and that of the liver was lower on 3 T. Imaging at 3 T showed significantly higher image quality and lower artifacts for breath hold with PI compared with free breathing. Most apparent diffusion coefficients were not significantly different between the 2 magnets (P > 0.05).
  
  
  CONCLUSIONS
  Three-tesla magnets can provide good images using breath hold with PI sequence.
authors.affiliation: Department of Radiological Sciences of University of California, Irvine, CA 92868-3298, USA. fsaremi@uci.edu
authors.forename: Farhood
authors.initials: F
authors.lastname: Saremi
authors.forename: Mehdi
authors.initials: M
authors.lastname: Jalili
authors.forename: Sepideh
authors.initials: S
authors.lastname: Sefidbakht
authors.forename: Stephanie
authors.initials: S
authors.lastname: Channual
authors.forename: Lisa
authors.initials: L
authors.lastname: Quane
authors.forename: Nassim
authors.initials: N
authors.lastname: Naderi
authors.forename: Helmuth
authors.initials: H
authors.lastname: Schultze-Haakh
authors.forename: Maria
authors.initials: M
authors.lastname: Torrone
mesh_terms: D000005:Abdomen / Q000033:anatomy & histology*; D000328:Adult; D000368:Aged; D016477:Artifacts; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012016:Reference Values; D015203:Reproducibility of Results