title: In vivo characterisation of coronary plaques with conventional grey-scale intravascular ultrasound: correlation with optical coherence tomography.
abstract: OBJECTIVE
  Although intravascular ultrasound (IVUS) is widely used, there is limited published data on its accuracy in defining plaque characteristics in vivo. Optical coherence tomography (OCT) is a high-resolution imaging technique that takes advantage of the pronounced optical contrast between the components of normal and diseased vessels. The aim of this study was to evaluate the ability of conventional grey-scale IVUS in identifying in vivo coronary plaque characteristics, in particular lipid content as a marker of the vulnerable plaque, when compared to OCT.
  
  
  RESULTS
  In patients undergoing cardiac catheterisation, IVUS and OCT imaging was performed. Detailed qualitative analysis of lipid-rich plaque, calcific plaque, and plaque disruption were performed at corresponding sites using both modalities. A total of 146 matched sites were available for analysis. When compared to OCT, sensitivity of IVUS for identification of lipid pools was low (24.1%) but specificity was high (93.9%). The sensitivity and specificity of IVUS for detection of calcific plaque and plaque disruption were respectively 92.9%; 66.4%, and 66.7%; 96.1%.
  
  
  CONCLUSIONS
  Conventional grey-scale IVUS may not be a reliable imaging modality for detection of lipid-rich and hence vulnerable plaques. This has important implications in using conventional grey-scale IVUS to identify the vulnerable plaque.
authors.affiliation: Cardiology Division, Massachusetts General Hospital, Boston, MA, USA.
authors.forename: Adrian F
authors.initials: AF
authors.lastname: Low
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Kawase
authors.forename: Yiong-Huak
authors.initials: YH
authors.lastname: Chan
authors.forename: Guillermo J
authors.initials: GJ
authors.lastname: Tearney
authors.forename: Brett E
authors.initials: BE
authors.lastname: Bouma
authors.forename: Ik-Kyung
authors.initials: IK
authors.lastname: Jang
mesh_terms: D002114:Calcinosis / Q000175:diagnosis; D006328:Cardiac Catheterization; D003324:Coronary Artery Disease / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D006801:Humans; D008055:Lipids / Q000032:analysis; D015588:Observer Variation; D011237:Predictive Value of Tests; D011446:Prospective Studies; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence; D018084:Ultrasonography, Interventional
chemical_list: D008055:Lipids