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- W2012257421 abstract "Functional near-infrared spectroscopy (fNIRS) has the potential of easily detecting cerebral activity. However, inpractical fNIRS measurements, a subject's physical or physiological changes such as body movements have oftencaused serious problems. If such a change is evoked by the tasks being monitored, it strongly correlates with thetask sequence, and its interference in fNIRS cannot be eliminated using conventional signal filtering techniques.Hence, further improvement is necessary to eliminate such interference if we intend to use fNIRS on subjectswith little or no physical restraint such as infants. We introduced an additional detector (d 2 ) between the sourceand detector (d 1 ) positioned in a conventional arrangement. The distances from the source to the detector d 1 and d 2 were set at 30 mm and 20 mm, respectively. Concentration changes of oxygenated and deoxygenatedhemoglobin (ΔHbO and ΔHbR) were calculated using the linear combination of absorbance changes at d1 andd 2 . Then tasks such as the upper-body tilting, the head nodding, the breath holding, and the finger oppositionwere performed by the participant. The statistical significance of the difference in concentration changes ofΔHbO and ΔHbR between task and rest periods was examined using the paired t-test. The results showed thatinterference due to upper-body tilting, head nodding, and breath holding was reduced by this method. Moreover,in the finger opposition task, a simultaneous increase of ΔHbO and decrease of ΔHbR was observed and thesewere significantly localized in the activation area by this method." @default.
- W2012257421 created "2016-06-24" @default.
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- W2012257421 date "2009-02-12" @default.
- W2012257421 modified "2023-10-18" @default.
- W2012257421 title "Multidistance probe arrangement to eliminate motion artifacts in fNIRS" @default.
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- W2012257421 doi "https://doi.org/10.1117/12.808616" @default.
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