Functional Near Infrared Spectroscopy (NIRS) is a non-invasive optical imaging technique, the guiding principle of which is that the chromophores oxygenated haemoglobin (oxy-Hb) and deoxygenated haemoglobin (deoxy-Hb) absorb light at different wavelengths. Therefore, by measuring the amount of light absorbance at a two nominal wavelengths (~765 and 855 nm), the concentrations of oxy-Hb and deoxy-Hb, respectively, can be calculated. Infrared light is introduced through the skull via a laser emitter and measured, following transit through the upper surface of the cortex, by an optode placed at a pre-set distance from the light source. In this way NIRS can be used as a measure of activation of neural tissue or simply as a measure of local cerebral blood flow.
Local cerebral blood flow utilising 2, 4, 8 and 12 channel arrays.
Hardware: 12 channel Oxymon Mk III (Artinis Medical Systems b.v.).
Brain, Performance and Nutrition Research Centre
Faculty of Health and Life Sciences
4th Floor, Northumberland Building
Newcastle upon Tyne