Short-separation channel
Definition: A short separation channel is generated by placing a source and a detector at a short distance, in case of the adult brain, this is typically ~ 1 cm or less, in contrast to regular long-separation channels with ~3 cm source-detector distances. At such distances, channels are mostly sensitive to systemic activity resulting from extracerebral tissues (i.e., scalp and skull). The signal from these channels can be used to regress out extra-cerebral contaminations from the long-separation fNIRS signal in order to isolate the cortical functional response.
Alternative definition:
Synonym: short-distance channel, short channel
References: e.g. https://doi.org/10.1016/j.neuroimage.2013.04.070https://doi.org/10.1117/1.NPh.2.2.025005
https://doi.org/10.1117%2F1.NPh.3.3.031405
Related terms: Extra-cerebral signal, Source-detector separation, Measurement Channel