Spectral Optical Properties of Gray Matter in Human Male Brain Tissue Measured at 400–1100 nm

Gray matter, in the outermost layer of cerebral cortex, plays a significant role processing important information, such as when reasoning and planning, addition to influencing intelligence, emotion, memory, language. In this paper, measurements optical properties, attenuation coefficients, scattering efficiency, penetration depth gray matter cortex were measured fresh brain tissue healthy human male at spectral range 400–1100 nm. Determining properties is for developing NIR noninvasive diagnostic imaging techniques therapy. The absorption spectra tissues obtained here showed clear peaks 550 580 nm due HBO2 970 water. coefficient, transport length, 800 possible was roughly 3.8 mm, determined by theoretical limit resulting from ballistic snake photons. Using Beer’s law Mie model, structural density neurons, tissue, investigated first time. neurons examined sample estimated 40,000 neurons/mg.