title: Magnetic resonance imaging of pericardial constriction: comparison of cine MR angiography and spin-echo techniques.
abstract: OBJECTIVE
  Spin-echo (SE) MRI detects pericardial thickening in pericardial constriction but the validity of extrapolating SE criteria to cine MRA imaging has not been tested. Pericardial thickness measured by SE and cine MRA was compared in patients with and without pericardial thickening to determine if the range of pericardial thickness measured by the two techniques is the same.
  
  
  METHODS
  Fourteen patients, investigated for possible pericardial constriction (PC), were compared with 24 subjects without evidence of pericardial disease (controls). Images were acquired using SE and cine MRA. Pericardial thickness was compared with final diagnosis.
  
  
  RESULTS
  Pericardial thickening ( > 3.5 mm) by SE detected pericardial constriction: sensitivity = 100% specificity = 96%, kappa = 0.91. Cine MRA had a sensitivity = 86%, specificity = 63%, kappa = 0.33. Maximum differences between SE and cine MRA pericardial thickness ranged from +2.5 mm to -2/7 mm.
  
  
  CONCLUSIONS
  Spin-echo identifies pericardial thickening with little overlap between measurements in patients with and without pericardial constriction. Pericardial thickness on cine MRA usually exceeds SE thickness, but with considerable overlap of thickness measurements in patients with and without pericardial constriction. Cine MRA cannot be used alone to diagnose pericardial thickening.
authors.affiliation: Department of Radiological Sciences, Deaconess Hospital, Boston, USA.
authors.forename: G G
authors.initials: GG
authors.lastname: Hartnell
authors.forename: L A
authors.initials: LA
authors.lastname: Hughes
authors.forename: J P
authors.initials: JP
authors.lastname: Ko
authors.forename: M C
authors.initials: MC
authors.lastname: Cohen
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D019028:Magnetic Resonance Imaging, Cine; D010494:Pericarditis, Constrictive / Q000175:diagnosis*; D012680:Sensitivity and Specificity