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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/12318

Title: Task-related oxygenation and cerebral blood volume changes estimated from NIRS signals in motor and cognitive tasks
Authors: Tanaka, Hirokazu
Katura, Takusige
Sato, Hiroki
Keywords: Neuroimaging
Signal processing
Task related component analysis
Near-infrared spectroscopy
Issue Date: 2014-03-15
Publisher: Elsevier
Magazine name: NeuroImage
Volume: 94
Start page: 107
End page: 119
DOI: 10.1016/j.neuroimage.2014.02.036
Abstract: Although functional near-infrared spectroscopy (fNIRS) has an advantage of simultaneously measuring changes in oxy- and deoxy-hemoglobin concentrations (Δ[HbO] and Δ[HbR]), only few analysis approaches exploit this advantage. As an extension of our recently proposed method (task-related component analysis, TRCA), this study proposes a new analysis method that extracts task-related oxygenation and cerebral blood volume (CBV) changes. In the original formulation of TRCA, task-relatedness of a signal is defined as consistent appearance of a same waveform in every task block, thereby constructing task-related components by maximizing inter-block covariance. The new method proposes that, in addition to maximizing inter-block covariance, the covariance between task-related Δ[HbO] and Δ[HbR] is maximized (TRCA^+) or minimized (TRCA^-) so that oxygenation and CBV changes are maximally contrasted. The proposed method (collectively called TRCA^±) was formulated as a matrix eigenvalue problem, which can be solved efficiently with standard numerical methods, and was tested with a synthetic data generated by a balloon model, successfully recovering oxygenation and CBV components. fNIRS data from sensorimotor areas in a finger-tapping task and from prefrontal lobe in a working-memory (WM) task were then analyzed. For both tasks, the time courses and the spatial maps for oxygenation and CBV changes were found to differ consistently, providing certain constraints the parameters of balloon models. In summary. TRCA can estimate task-related oxygenation and CBV changes simultaneously, thereby extending the applicability of fNIRS.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Hirokazu Tanaka, Takusige Katura, Hiroki Sato, NeuroImage, 94, 2014, 107-119, http://dx.doi.org/10.1016/j.neuroimage.2014.02.036
URI: http://hdl.handle.net/10119/12318
Material Type: author
Appears in Collections:b10-1. 雑誌掲載論文 (Journal Articles)

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