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Journal of Biomedical Optics • new

Detection and characterization of early plaque formations by Raman probe spectroscopy and optical coherence tomography: an in vivo study on a rabbit model
Author(s): Christian Matthäus; Sebastian Dochow; Kokila D. Egodage; Bernd F. Romeike; Bernhard R. Brehm; Jürgen Popp
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Paper Abstract

Intravascular imaging techniques provide detailed specification about plaque appearance and morphology, but cannot deliver information about the biochemical composition of atherosclerotic plaques. As the biochemical composition is related to the plaque type, important aspects such as the risk of a plaque rupture and treatment are still difficult to assess. Currently, various spectroscopic techniques are tested for potential applications for the chemical analysis of plaque depositions. Here, we employ Raman spectroscopy in combination with optical coherence tomography (OCT) for the characterization of plaques on rabbits in vivo. Experiments were carried out on New Zealand white rabbits treated with a fat- and cholesterol-enriched diet, using a Raman probe setup with a 785-nm multimode laser as an excitation source. Subsequently, OCT images were acquired with a swept source at 1305 ± 55    nm at 22.6 mW. Raman spectra were recorded from normal regions and regions with early plaque formations. The probe positioning was monitored by x-ray angiography. The spectral information identified plaque depositions consisting of lipids, with triglycerides as the major component. Afterward, OCT images of the spectroscopically investigated areas were obtained. The spectral information correlates well with the observed intravascular morphology and is in good agreement with histology. Raman spectroscopy can provide detailed biochemical specification of atherosclerotic plaques.

Paper Details

Date Published: 9 January 2018
PDF: 6 pages
J. Biomed. Opt. 23(1) 015004 doi: 10.1117/1.JBO.23.1.015004
Published in: Journal of Biomedical Optics Volume 23, Issue 1
Show Author Affiliations
Christian Matthäus, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Sebastian Dochow, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Kokila D. Egodage, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Bernd F. Romeike, Friedrich-Schiller-Univ. Jena (Germany)
Bernhard R. Brehm, Herz-Neuro-Zentrum Bodensee (Switzerland)
Jürgen Popp, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Friedrich-Schiller-Univ. Jena (Germany)

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