title: Abdominal MR imaging: evaluation of a fast spin-echo sequence.
abstract: OBJECTIVE
  To compare contrast of abdominal tissue on magnetic resonance (MR) images obtained with T2-weighted conventional spin-echo (SE) and fast spin-echo (FSE) sequences.
  
  
  METHODS
  Forty-eight patients (26 men and 22 women, aged 24-77 years) with known or suspected liver disease underwent FSE and SE MR imaging at 1.5 T. Signal intensity (SI) and ratios of signal-to-noise (S/N), signal difference-to-noise (SD/N), and SI were calculated for the spleen, pancreas, kidney, muscle, fat, and malignant liver lesions compared with liver.
  
  
  RESULTS
  Significant differences were found between SD/N on FSE and SE images of all tissues, with FSE images providing lower SD/N for all tissues except fat. Malignant liver lesions (n = 69) showed lower SI ratios on the FSE compared with the SE images. Differences in mean SI ratios between malignant liver lesions and hemangiomas or cysts (n = 41) were significant on the FSE images (P = .01) but not on the SE images (P = .27).
  
  
  CONCLUSIONS
  Compared with conventional T2-weighted SE images, small but significant differences in tissue-to-liver contrast were obtained for some tissues, including malignant liver lesions, on FSE images.
authors.affiliation: Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, PA 19107.
authors.forename: E K
authors.initials: EK
authors.lastname: Outwater
authors.forename: D G
authors.initials: DG
authors.lastname: Mitchell
authors.forename: S
authors.initials: S
authors.lastname: Vinitski
mesh_terms: D000005:Abdomen / Q000473:pathology*; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008107:Liver Diseases / Q000175:diagnosis; D008113:Liver Neoplasms / Q000175:diagnosis; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged