title: Assessment of coronary flow reserve: comparison between contrast-enhanced magnetic resonance imaging and positron emission tomography.
abstract: OBJECTIVE
  The study compared flow reserve indices by magnetic resonance imaging (MRI) with quantitative measures of coronary angiography and positron emission tomography (PET).
  
  
  BACKGROUND
  The noninvasive evaluation of myocardial flow by MRI has recently been introduced. However, a comparison to quantitative flow measurement as assessed by PET has not been reported in patients with coronary artery disease (CAD).
  
  
  METHODS
  Two groups of healthy volunteers and 25 patients with angiographically documented CAD were examined by MRI and PET at rest and during adenosine stress. Dynamic MRI was performed using a multi-slice ultra-fast hybrid sequence and a rapid gadolinium-diethylenetriaminepenta-acetic acid bolus injection (0.05 mmol/l). Upslope and peak-intensity indices were regionally determined from first-pass signal intensity curves and compared to N-13 ammonia PET flow reserve measurements.
  
  
  RESULTS
  In healthy volunteers, the upslope analysis showed a stress/rest index of 2.1 plus minus 0.6, which was higher than peak intensity (1.5 plus minus 0.3), but lower than flow reserve by PET (3.9 plus minus 1.1). Localization of coronary artery stenoses (> 75%, MRI < 1.2), based on the upslope index, yielded sensitivity, specificity and diagnostic accuracy of 69%, 89% and 79%, respectively. Upslope index correlated with PET flow reserve (r = 0.70). A reduced coronary flow reserve (PET < 2.0, MRI < 1.3) was detected by the upslope index with sensitivity, specificity and diagnostic accuracy of 86%, 84% and 85%, respectively.
  
  
  CONCLUSIONS
  Magnetic resonance imaging first-pass perfusion measurements underestimate flow reserve values, but may represent a promising semi-quantitative technique for detection and severity assessment of regional CAD.
authors.affiliation: Nuklearmedizinische Klinik und Poliklinik der Technischen Universität München, Munich, Germany.
authors.forename: Tareq
authors.initials: T
authors.lastname: Ibrahim
authors.forename: Stephan G
authors.initials: SG
authors.lastname: Nekolla
authors.forename: Karin
authors.initials: K
authors.lastname: Schreiber
authors.forename: Kenichi
authors.initials: K
authors.lastname: Odaka
authors.forename: Stefan
authors.initials: S
authors.lastname: Volz
authors.forename: Julinda
authors.initials: J
authors.lastname: Mehilli
authors.forename: Martin
authors.initials: M
authors.lastname: Güthlin
authors.forename: Wolfram
authors.initials: W
authors.lastname: Delius
authors.forename: Markus
authors.initials: M
authors.lastname: Schwaiger
mesh_terms: D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology; D017023:Coronary Angiography; D003324:Coronary Artery Disease / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000503:physiopathology; D003326:Coronary Circulation / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D014055:Tomography, Emission-Computed