title: Interstudy reproducibility of quantitative perfusion cardiovascular magnetic resonance.
abstract: OBJECTIVE
  To determine the interstudy reproducibility of quantitative first-pass perfusion cardiovascular magnetic resonance with comparison of 2 previously described analysis techniques. There is no published data on the interstudy reproducibility of perfusion cardiovascular magnetic resonance which can be used to determine the significance of longitudinal changes in myocardial perfusion after pharmacologic or therapeutic interventions with defined sample sizes.
  
  
  METHODS
  Sixteen subjects (7 normal volunteers, 9 patients with coronary artery disease) had rest and adenosine stress perfusion cardiovascular magnetic resonance studies on two separate visits. A short axis slice was studied on each visit using a fast low-angle shot sequence. The global and regional myocardial perfusion reserve indices were calculated using 2 methods: model based constrained deconvolution with the Fermi function, and normalized upslopes. Reproducibility was defined as the standard deviation of the measurement differences, divided by the mean (coefficient of variation).
  
  
  RESULTS
  The reproducibility of global myocardial perfusion reserve indices was 21% in normal volunteers, which was similar to that in patients with coronary artery disease (CAD) (23%, p = .88). The reproducibility of regional myocardial perfusion reserve indices was 28% (p = .45 vs. global analysis). The reproducibility of global MPRi was superior with Fermi deconvolution compared with normalized upslopes (21% vs. 41%, p = .02).
  
  
  CONCLUSIONS
  At this stage of clinical development, the reproducibility of quantitative perfusion cardiovascular magnetic resonance is good, and superior using Fermi deconvolution in preference to upslope analysis.
authors.affiliation: Cardiovascular Magnetic Resonance Unit, Royal Brompton Hospital, London, UK.
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Elkington
authors.forename: Peter D
authors.initials: PD
authors.lastname: Gatehouse
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Ablitt
authors.forename: Guang-Zhong
authors.initials: GZ
authors.lastname: Yang
authors.forename: David N
authors.initials: DN
authors.lastname: Firmin
authors.forename: Dudley J
authors.initials: DJ
authors.lastname: Pennell
mesh_terms: D000241:Adenosine; D000328:Adult; D000368:Aged; D015986:Confounding Factors, Epidemiologic; D003324:Coronary Artery Disease / Q000175:diagnosis* / Q000453:epidemiology* / Q000503:physiopathology; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D009200:Myocardial Contraction; D015425:Myocardial Reperfusion; D015588:Observer Variation; D015203:Reproducibility of Results; D012146:Rest; D014665:Vasodilator Agents
chemical_list: D014665:Vasodilator Agents; D000241:Adenosine