title: MR-IMPACT: comparison of perfusion-cardiac magnetic resonance with single-photon emission computed tomography for the detection of coronary artery disease in a multicentre, multivendor, randomized trial.
abstract: OBJECTIVE
  To determine in a multicentre, multivendor trial the diagnostic performance for perfusion-cardiac magnetic resonance (perfusion-CMR) in comparison with coronary X-ray angiography (CXA) and single-photon emission computed tomography (SPECT).
  
  
  RESULTS
  Of 241 eligible patients from 18 centres, 234 were randomly dosed with 0.01, 0.025, 0.05, 0.075, or 0.1 mmol/kg Gd-DTPA-BMA (Omniscantrade mark, GE-Healthcare) per stress (0.42 mg/kg adenosine) and rest perfusion study. Coronary artery disease (CAD) was defined as diameter stenosis > or =50% on quantitative CXA. Five CMR and eight SPECT studies (of 225 complete studies) were excluded from analyses due to inadequate quality (three blinded readers scored per modality). The comparison of CMR vs. SPECT was based on receiver operating characteristic (ROC) analysis. Perfusion-CMR at the optimal CM dose (0.1 mmol/kg) had similar performance as SPECT, if only the SPECT studies of the 42 patients with this dose were considered [area under ROC curve (AUC): 0.86 +/- 0.06 vs. 0.75 +/- 0.09 for SPECT, P = 0.12]; however, diagnostic performance of perfusion-CMR was better vs. the entire SPECT population (AUC: 0.67 +/- 0.05, n = 212, P = 0.013).
  
  
  CONCLUSIONS
  In this multicentre, multivendor trial, ROC analyses suggest perfusion-CMR as a valuable alternative to SPECT for CAD detection showing equal performance in the head-to-head comparison. Comparing perfusion-CMR with the entire SPECT population suggests CMR superiority over SPECT, which warrants further evaluation in larger trials.
authors.affiliation: Division of Cardiology, University Hospital Zurich, Raemistrasse 100, CH-8091 Zurich, Switzerland. juerg.schwitter@usz.ch
authors.forename: Juerg
authors.initials: J
authors.lastname: Schwitter
authors.forename: Christian M
authors.initials: CM
authors.lastname: Wacker
authors.forename: Albert C
authors.initials: AC
authors.lastname: van Rossum
authors.forename: Massimo
authors.initials: M
authors.lastname: Lombardi
authors.forename: Nidal
authors.initials: N
authors.lastname: Al-Saadi
authors.forename: Hakan
authors.initials: H
authors.lastname: Ahlstrom
authors.forename: Thorsten
authors.initials: T
authors.lastname: Dill
authors.forename: Henrik B W
authors.initials: HB
authors.lastname: Larsson
authors.forename: Scott D
authors.initials: SD
authors.lastname: Flamm
authors.forename: Moritz
authors.initials: M
authors.lastname: Marquardt
authors.forename: Lars
authors.initials: L
authors.lastname: Johansson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003324:Coronary Artery Disease / Q000175:diagnosis* / Q000000981:diagnostic imaging; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods*