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  • Near-infrared spectroscopy (NIR spectroscopy) laser scanning systems designed to provide data and images showing the lipid composition of the inner layers of the vascular walls (i.e., intravascular). The light wavelength changes are detected and automatically analyzed to determine the absorption and changes in speed after the light passes across the tissue and is reflected back;, resulting in optical slice color images showing the chemical composition of the vascular wall tissue that can be viewed on a video display terminal. The system usually consists of a central computerized unit that includes the laser source, optical processors, analysis software, and a detachable intravascular dedicated fiberoptic catheter. Intravascular NIR spectroscopy systems are intended to assess the lipid content of artery (e.g., coronary) plaque to facilitate patient diagnosis and/or treatment.
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