title: Note: three wavelengths near-infrared spectroscopy system for compensating the light absorbance by water.
abstract: Given that approximately 80% of blood is water, we develop a wireless functional near-infrared spectroscopy system that detects not only the concentration changes of oxy- and deoxy-hemoglobin (HbO and HbR) during mental activity but also that of water (H2O). Additionally, it implements a water-absorption correction algorithm that improves the HbO and HbR signal strengths during an arithmetic task. The system comprises a microcontroller, an optical probe, tri-wavelength light emitting diodes, photodiodes, a WiFi communication module, and a battery. System functionality was tested by means of arithmetic-task experiments performed by healthy male subjects.
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, South Korea.
authors.forename: M Raheel
authors.initials: MR
authors.lastname: Bhutta
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, South Korea.
authors.forename: Keum-Shik
authors.initials: KS
authors.lastname: Hong
authors.affiliation: Department of Biomedical Engineering, Korea University, Seoul 136-703, South Korea.
authors.forename: Beop-Min
authors.initials: BM
authors.lastname: Kim
authors.affiliation: Department of Education Policy and Social Analysis, Columbia University, New York, New York 10027, USA.
authors.forename: Melissa Jiyoun
authors.initials: MJ
authors.lastname: Hong
authors.affiliation: Department of Physical and Rehabilitation Medicine, Sungkyunkwan University School of Medicine, Seoul 135-710, South Korea.
authors.forename: Yun-Hee
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, South Korea.
authors.forename: Se-Ho
authors.initials: SH
authors.lastname: Lee
mesh_terms: D000042:Absorption; D000465:Algorithms; D006454:Hemoglobins / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D008027:Light; D008297:Male; D010108:Oxyhemoglobins / Q000737:chemistry / Q000378:metabolism*; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation*; D014867:Water / Q000737:chemistry* / Q000378:metabolism; D059015:Wireless Technology
chemical_list: D006454:Hemoglobins; D010108:Oxyhemoglobins; D014867:Water; C100003:deoxyhemoglobin