Scalp blood flow

Definition: Scalp blood flow (subcutaneous blood flow) refers to the blood circulating in the network of blood vessels within the scalp. It is influenced by various factors including cardiac output, ambient temperature and activity of the autonomic nervous system. Scalp blood flow changes can be measured by a laser Doppler flowmeter. Scalp perfusion can change during the measurement thus representing an extracerebral confounder in the fNIRS signal. Its interference can be minimized using short-separation channels sampling data from the scalp and regressing these out from the long-separation channels.

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References: https://doi.org/10.1016/j.neuroimage.2016.08.058 https://doi.org/10.1117/1.NPh.2.2.025005

Seiyama A, Miura T, Sasaki Y, Okahashi S, Konishi N, Cassim M. Characterization of forehead blood flow bias on NIRS signals during neural activation with a verbal fluency task. Neurosci Res. 2023 Jan;186:43-50. doi: https://doi.org/10.1016/j.neures.2022.09.012

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