Thursday, April 8, 2010

Brain monitoring with NIR light

Related to this post, although a quite different method: "Hitachi to Launch Wearable Brain Analyzer".
The new encephalometer was developed based on the "optical topography method (NIRS: near infrared spectroscopy)," a brain monitoring method that Hitachi developed in 1995. Far-red light passes through a skull, etc and is scattered and reflected inside the brain. By measuring the degrees of the scattering and reflection, the encephalometer estimates the change in blood flow inside the brain. Specifically, it monitors hemoglobins.
[...]
The wavelengths are 705 and 830nm. The encephalometer has eight irradiation parts, eight light-receiving parts and 22 channels.

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