title: Role of spectral presaturation attenuated inversion-recovery fat-suppressed T2-weighted MR imaging in active inflammatory bowel disease.
abstract: OBJECTIVE
  To retrospectively evaluate the efficacy of spectral presaturation attenuated inversion-recovery (SPAIR) fat-suppressed (FS) partial Fourier single shot (SSH) T2-weighted (T2W) and gadolinium-enhanced (Gd) FS 3D-gradient echo (3DGRE) T1-weighted (T1W) delayed phase MRI to differentiate active bowel inflammation from fibrotic disease in patients with Crohn's disease (CD).
  
  
  METHODS
  MRI studies of 81 patients (mean age, 43 years; range, 22-77 years; M:F ratio 33:48) had T2W and T1W imaging including SPAIR-SSH and delayed Gd-3DGRE. The ability to assess disease activity in bowel segments affected were retrospectively evaluated by a grading scheme based on subjective analysis of signal intensities. These results were compared against the standard clinical parameters of disease activity.
  
  
  RESULTS
  SPAIR-SSH images correlated better (r=0.74, P<0.0001) with activity than delayed Gd-3DGRE (r=0.39, P=0.0003), with a significant difference between the two techniques (P<0.0001). SPAIR-SSH images showed higher specificity in detection of severely active disease in per patient (98%) and segmental (98%) analysis compared to Gd-3DGRE (57%, 70%). Gd-3DGRE technique showed significantly higher sensitivity (P=0.01) in identifying active disease in per patient (83%) and segmental (85%) analysis compared to SPAIR-SSH (70%, 64%).
  
  
  CONCLUSIONS
  SPAIR-SSH detects actively diseased CD bowel segments with a high level of specificity. Noninflammatory bowel fibrosis corresponds to abnormal uptake on delayed phase Gd-3DGRE images but without associated elevated abnormal signal on SPAIR-SSH.
authors.affiliation: Department of Radiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
authors.forename: Unni K
authors.initials: UK
authors.lastname: Udayasankar
authors.forename: Diego
authors.initials: D
authors.lastname: Martin
authors.forename: Thomas
authors.initials: T
authors.lastname: Lauenstein
authors.forename: Robin
authors.initials: R
authors.lastname: Rutherford
authors.forename: John
authors.initials: J
authors.lastname: Galloway
authors.forename: Dana
authors.initials: D
authors.lastname: Tudorascu
authors.forename: Shanthi V
authors.initials: SV
authors.lastname: Sitaraman
mesh_terms: D000273:Adipose Tissue / Q000473:pathology*; D000328:Adult; D000368:Aged; D000465:Algorithms; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D015212:Inflammatory Bowel Diseases / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055815:Young Adult
chemical_list: D003287:Contrast Media; C064925:gadodiamide; D019786:Gadolinium DTPA