Circulation. 2003;107:851-856
Published online before print January 27, 2003, doi: 10.1161/01.CIR.0000048145.52309.31
Published online before print January 27, 2003, doi: 10.1161/01.CIR.0000048145.52309.31
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(Circulation. 2003;107:851.)
© 2003 American Heart Association, Inc.
Clinical Investigation and Reports |
Quantitative Magnetic Resonance Imaging Analysis of Neovasculature Volume in Carotid Atherosclerotic Plaque
From the Departments of Radiology (W.K., C.Y.), Bioengineering (A.H., M.S., P.V., C.Y.), and Surgery (T.H.), University of Washington, Seattle; Marina Ferguson, Inc (M.F.), Seattle, Wash; and the Department of Surgery and Perioperative Care (T.H.), VA Puget Sound Health Care System, Seattle, Wash.
Correspondence to William Kerwin, PhD, University of Washington, Department of Radiology, Box 357115, 1959 NE Pacific Avenue, Seattle, WA 98195. E-mail bkerwin{at}u.washington.edu
Background— Neovasculature within atherosclerotic plaques is believed to be associated with infiltration of inflammatory cells and plaque destabilization. The aim of the present investigation was to determine whether the amount of neovasculature present in advanced carotid plaques can be noninvasively measured by dynamic, contrast-enhanced MRI.
Methods and Results— A total of 20 consecutive patients scheduled for carotid endarterectomy were recruited to participate in an MRI study. Images were obtained at 15-second intervals, and a gadolinium contrast agent was injected coincident with the second of 10 images in the sequence. The resulting image intensity within the plaque was tracked over time, and a kinetic model was used to estimate the fractional blood volume. For validation, matched sections from subsequent endarterectomy were stained with ULEX and CD-31 antibody to highlight microvessels. Finally, all microvessels within the matched sections were identified, and their total area was computed as a fraction of the plaque area. Results were obtained from 16 participants, which showed fractional blood volumes ranging from 2% to 41%. These levels were significantly higher than the histological measurements of fractional vascular area. Nevertheless, the 2 measurements were highly correlated, with a correlation coefficient of 0.80 (P<0.001).
Conclusions— Dynamic contrast-enhanced MRI provides an indication of the extent of neovasculature within carotid atherosclerotic plaque. MRI therefore provides a means for prospectively studying the link between neovasculature and plaque vulnerability.
Key Words: magnetic resonance imaging • contrast media • carotid arteries • atherosclerosis
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