Detection of an unstable and/or a weak probe contact in a multichannel functional near-infrared spectroscopy measurement

Shinji Umeyama; Toru Yamada

doi:10.1117/1.JBO.18.4.047003

3 April 2013 Detection of an unstable and/or a weak probe contact in a multichannel functional near-infrared spectroscopy measurement

Shinji Umeyama, Toru Yamada

Author Affiliations +

Journal of Biomedical Optics, Vol. 18, Issue 4, 047003 (April 2013). https://doi.org/10.1117/1.JBO.18.4.047003

Abstract

Multichannel functional near-infrared spectroscopy measurements involve the placement of many probes on a subject’s head. A stable close contact between the probe and head surface is essential. We propose a way to detect two types of problematic probe contacts from the measurement data: an unstable contact whose light transmission easily fluctuates with body motion, and a weak contact whose light transmission is constantly small. An unstable contact causes large baseline fluctuation, whereas a weak contact causes large noise. Because absorbance changes caused by body motion and noise show different spectroscopic properties from the tissue hemoglobin absorption, they have a component orthogonal to the plane spanned by hemoglobin molar extinction coefficient vectors. We use this information to detect unstable and/or weak contacts. Probes are shared by different channels, and this sharing configuration is determined by the probe arrangement. Thus, the baseline fluctuation and noise of the channels are related to contact instability and weakness of the probe according to the probe arrangement. Unstable and/or weak probes are determined by solving an inverse problem of this relation. Problematic probes can be effectively determined using the proposed method.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Shinji Umeyama and Toru Yamada "Detection of an unstable and/or a weak probe contact in a multichannel functional near-infrared spectroscopy measurement," Journal of Biomedical Optics 18(4), 047003 (3 April 2013). https://doi.org/10.1117/1.JBO.18.4.047003

Published: 3 April 2013

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Cited by 13 scholarly publications and 3 patents.

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KEYWORDS

Absorbance

Linear filtering

Sensors

Transmittance

Near infrared spectroscopy

Head

Absorption

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