fNIRS imaging depth is about half the source-detector separation distance
Evidence
The detected light beam has scattered in a banana-shaped pathway through the brain reaching a depth of approximately half the distance between the source and detector. In a montage of multiple optodes, each source can be associated with a number of surrounding detectors to form a multi-channel measurement system. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4274
Categorization
Category: Factual Claims
Related
- fNIRS samples a banana-shaped brain region roughly halfway between source and detector. (similarity 0.82)
- fNIRS measures brain blood flow via paired scalp light sources and detectors (similarity 0.78)
Broader Connections
- Diffusion depth scales proportionally with wavelength, so lower frequencies demand deeper surfaces
#expands(0.85) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2096