HEG

HEG or Hemoencephalography, is a type of fNIR imaging used to monitor activity patterns of neurons in the brain. It works by taking advantage of the translucence of the human cranium to certain infrared wavelengths, and uses two infrared light sources placed on the forehead, together with triangulation and refraction algorithms, to calculate how much of the infra red light gets absorbed by oxygen in the blood's haemoglobin, and how much is reflected back. This is achieved by sensors placed around the cranium.

Hemoencephalography is thus a very cheap to implement form of fNIR, and like all forms of fNIR has several drawbacks in terms of speed and accuracy. It cannot penetrate very far into the brain, and only surface processes can be mapped in this manner.

See Also: fNIR

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FSAA Full Scene Anti-Aliasing HEG

Hemoencephalography

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