A noninvasive technique that uses the differential absorption properties
of hemoglobin and myoglobin to evaluate tissue oxygenation and indirectly
can measure regional hemodynamics and blood flow. Near-infrared light (NIR)
can propagate through tissues and at particular wavelengths is differentially
absorbed by oxgenated vs. deoxygenated forms of hemoglobin and myoglobin.
Illumination of intact tissue with NIR allows qualitative assessment of
changes in the tissue concentration of these molecules.
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