A cost function approach for the analysis of time-resolved functional near-infrared spectroscopy (TR fNIRS) signals

Junwoo Kim; Dug Young Kim

doi:10.1117/12.2289802

13 February 2018 A cost function approach for the analysis of time-resolved functional near-infrared spectroscopy (TR fNIRS) signals

Junwoo Kim, Dug Young Kim

Author Affiliations +

Proceedings Volume 10493, Dynamics and Fluctuations in Biomedical Photonics XV; 104930U (2018) https://doi.org/10.1117/12.2289802
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

Functional near-infrared spectroscopy (fNIRS) is a powerful clinical tool for monitoring hemoglobin concentration in brain tissues by analyzing absorption of scattered light. Since human brain is composed of multilayers including scalp, skull, and cerebral cortex, fNIRS signals need be analyzed with a multilayer tissue model. However, retrieving the optical properties of a multilayer tissue is often difficult because nonlinear fitting of absorption parameters from a scattered light signal by a tissue is ill-posed especially when the signal level is low. In this paper we introduce the cost function based masking technique for effective error minimization in the nonlinear fitting of fNIRS signals. We have shown that this method effectively reduces the influences of measurement errors with a newly defined cost function. Numerically simulated fNIRS data were generated for a two-layered tissue model and are used to extract the optical parameters of the two-layered tissue model. Accuracies of extracted parameters were compared with and without our proposed cost function.

Citation Download Citation

Junwoo Kim and Dug Young Kim "A cost function approach for the analysis of time-resolved functional near-infrared spectroscopy (TR fNIRS) signals", Proc. SPIE 10493, Dynamics and Fluctuations in Biomedical Photonics XV, 104930U (13 February 2018); https://doi.org/10.1117/12.2289802

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