on October 7, 2002
Circulation. 2002
Published online before print October 7, 2002, doi: 10.1161/01.CIR.0000035654.18341.5E
Published online before print October 7, 2002, doi: 10.1161/01.CIR.0000035654.18341.5E
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Submitted on May 15, 2002
From the Departments of Biomedical Engineering (A.N., B.D.K., D.G.V.) and Cardiology (E.M.T., P.S., S.E.N.), The Cleveland Clinic Foundation; and the Department of Biomedical Engineering (A.N.), Case Western Reserve University, Cleveland, Ohio. * To whom correspondence should be addressed. E-mail: vince{at}bme.ri.ccf.org.
Background—Atherosclerotic plaque stability is related to histological composition. However, current diagnostic tools do not allow adequate in vivo identification and characterization of plaques. Spectral analysis of backscattered intravascular ultrasound (IVUS) data has potential for real-time in vivo plaque classification. Methods and Results—Eighty-eight plaques from 51 left anterior descending coronary arteries were imaged ex vivo at physiological pressure with the use of 30-MHz IVUS transducers. After IVUS imaging, the arteries were pressure-fixed and corresponding histology was collected in matched images. Regions of interest, selected from histology, were 101 fibrous, 56 fibrolipidic, 50 calcified, and 70 calcified-necrotic regions. Classification schemes for model building were computed for autoregressive and classic Fourier spectra by using 75% of the data. The remaining data were used for validation. Autoregressive classification schemes performed better than those from classic Fourier spectra with accuracies of 90.4% for fibrous, 92.8% for fibrolipidic, 90.9% for calcified, and 89.5% for calcified-necrotic regions in the training data set and 79.7%, 81.2%, 92.8%, and 85.5% in the test data, respectively. Tissue maps were reconstructed with the use of accurate predictions of plaque composition from the autoregressive classification scheme. Conclusions—Coronary plaque composition can be predicted through the use of IVUS radiofrequency data analysis. Autoregressive classification schemes performed better than classic Fourier methods. These techniques allow real-time analysis of IVUS data, enabling in vivo plaque characterization.
Revised on August 16, 2002
Accepted on August 16, 2002
Coronary Plaque Classification With Intravascular Ultrasound Radiofrequency Data Analysis
Anuja Nair MS,
Key words: atherosclerosis • coronary disease • Fourier analysis • plaque • ultrasonics
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