Priya karthikeyan novels pdf6/11/2023 ![]() However, NIR propagation and light attenuation is also dependent on anatomy and size of the subject’s head. There are numerous simulation and phantom studies that show near-infrared (NIR) light can penetrate in the human head to a depth of approximately 1–2 cm, reaching the brain cortex. ![]() In these studies, particularly oxygenation changes in the cerebral cortex are of great interest since the concentrations of oxyhemoglobin (HbO) and deoxyhemoglobin (HbR) change due to coupling of hemodynamics to cortical neural activity. ![]() Near-infrared spectroscopy (NIRS) based techniques in brain monitoring utilize the spectrum range approximately between 650 nm and 950 nm, where light attenuation is low enough to enable reaching the cerebral cortex of the brain.
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