History
In 1977, Jobsis reported that brain tissue transparency to NIR light allowed a non-invasive and continuous method of tissue oxygen saturation using a trans-illumination technique. Tran-illumination techniques are of limited utility in adults because of light attenuation and was quickly replaced by reflectance-mode based techniques. Development of NIRS systems proceeded rapidly and by 1985, the first studies on cerebral oxygenation were conducted by M. Ferrari. NIRS techniques were expanded on by the work of Briton Chance, Arno Villringer, M. Cope, D. T. Delpy, Randall Barbour, and others.
Read more about this topic: FNIR
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