Multidistance probe arrangement to eliminate motion artifacts in fNIRS

Toru Yamada; Shinji Umeyama; Keiji Matsuda

doi:10.1117/12.808616

23 February 2009 Multidistance probe arrangement to eliminate motion artifacts in fNIRS

Toru Yamada, Shinji Umeyama, Keiji Matsuda

Proceedings Volume 7174, Optical Tomography and Spectroscopy of Tissue VIII; 717420 (2009) https://doi.org/10.1117/12.808616
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

Functional near-infrared spectroscopy (fNIRS) has the potential of easily detecting cerebral activity. However, in practical fNIRS measurements, a subject's physical or physiological changes such as body movements have often caused serious problems. If such a change is evoked by the tasks being monitored, it strongly correlates with the task 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 subjects with little or no physical restraint such as infants. We introduced an additional detector (d₂) between the source and detector (d₁) positioned in a conventional arrangement. The distances from the source to the detector d₁ and d₂ were set at 30 mm and 20 mm, respectively. Concentration changes of oxygenated and deoxygenated hemoglobin (ΔHbO and ΔHbR) were calculated using the linear combination of absorbance changes at d1 and d₂. Then tasks such as the upper-body tilting, the head nodding, the breath holding, and the finger opposition were performed by the participant. The statistical significance of the difference in concentration changes of ΔHbO and ΔHbR between task and rest periods was examined using the paired t-test. The results showed that interference 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 these were significantly localized in the activation area by this method.

Citation Download Citation

Toru Yamada, Shinji Umeyama, and Keiji Matsuda "Multidistance probe arrangement to eliminate motion artifacts in fNIRS", Proc. SPIE 7174, Optical Tomography and Spectroscopy of Tissue VIII, 717420 (23 February 2009); https://doi.org/10.1117/12.808616

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available