Optode
Definition: An optode is the distal end of an fNIRS system which interfaces with the surface of the tissue being measured. Optodes can contain a single source (source optode), a single detector (detector optode), or a source accompanied by a short-separation detector.
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References: https://doi.org/10.1016/j.neuroimage.2005.08.008https://biomedical.njit.edu/sites/biomedical/files/fNIRS%20Optode%20Helmet%20Construct.pdf
Related terms: source; detector; emitter; emission, receiver, transmitter