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Infrared penetration in tissue

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    Near-infrared window in biological tissue

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    What does this statement mean, 'human tissue is permeable to far-infrared light'? - Quora

    Traumatic brain injury TBI is a growing health concern effecting civilians and military personnel. Research has yielded a better understanding of the pathophysiology of TBI, but effective treatments have not been forthcoming. Yet, it remains unclear if sufficient photonic energy can be delivered to the human brain to yield a beneficial effect. This paper reviews the pathophysiology of TBI and elaborates the physiological effects of NIR in the context of this pathophysiology. Pertinent aspects of the physical properties of NIR, particularly in regards to its interactions with tissue, provide the background for understanding this critical issue of light penetration through tissue. Our recent tissue studies demonstrate no penetration of low level NIR energy through 2 mm of skin or 3 cm of skull and brain.
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    The human body is surprisingly translucent to to red, far red, and the lower wavelengths of near infrared NIR. Blood vessels near the surface are more clearly visible than the deeper bones. The purple or violet color indicates that the picture was taken with an unfiltered digital camera. Such cameras are much more sensitive than the human eye in the far red range — nm and the first nm of near infrared —
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    The near-infrared NIR window also known as optical window or therapeutic window defines the range of wavelengths from to nanometre nm where light has its maximum depth of penetration in tissue. Since scattering increases the distance travelled by photons within tissue, the probability of photon absorption also increases. Because scattering has weak dependence on wavelength, the NIR window is primarily limited by the light absorption of blood at short wavelengths and water at long wavelengths. The technique using this window is called NIRS. Medical imaging techniques such as fluorescence image-guided surgery often make use of the NIR window to detect deep structures.
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