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Scanning systems designed to generate an image of tissue in a given plane of the body using near-infrared (NIR) laser light sources, usually at more than one frequency (i.e., a process known as NIR spectroscopy). The light detected after passing across the tissue is analyzed to determine the absorption and changes in speed. This results in optical slices that are reconstructed to form a continuous image showing the chemical composition of tissue that can be viewed as a colored image on a video display terminal. These systems can be used in diagnostic procedures to differentiate tissues according their chemical and/or molecular composition; dedicated systems used to obtain intravascular images are available.
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