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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Data recording system and NIRS device. (a) The signals measured by the NIRS device are converted into O2Hb, HHb, THb, and StO2 in real time and recorded on the connected mobile phone. (b) The NIRS device consists of one light source and two photodetectors.