Note: Wearable near-infrared spectroscopy imager for haired region

Kiguchi, Masashi; Atsumori, Hirokazu; Fukasaku, Izumi; Kumagai, Y.; Funane, Tsukasa; Maki, Atsushi; Kasai, Y.; Ninomiya, A.

doi:10.1063/1.4704456

Cited by 23 publications

(29 citation statements)

References 6 publications

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“…Brain activation was identified as a significant increase in ΔHbO 2 or a significant decrease in ΔHbR by calculating the relative difference in the temporal mean of the averaged ΔHbO 2 and ΔHbR levels between 8 s and 20 s after hand gripping onset with respect to the average baseline, similar to (Kiguchi et al, 2012; Koenraadt et al, 2012). These values were tested against zero with a one-sided t -test within each channel.…”

Section: Methodsmentioning

confidence: 99%

“…It is an effective and non-invasive tool for monitoring oxygenation and cerebral hemodynamics (Boas et al, 2004; Villringer and Chance, 1997) showing good agreement with simultaneously acquired fMRI measurements (Eggebrecht et al, 2012; Hoge et al, 2005; Huppert et al, 2006; Kleinschmidt et al, 1996; Steinbrink et al, 2006; Strangman et al, 2002). It has been promoted for its i) non-invasive, non-ionizing nature, ii) bed-side applicability (Obrig and Villringer, 2003; Steinkellner et al, 2010; Tobias, 2006; Toet and Lemmers, 2009), iii) relatively low costs, iv) ease of integration with other modalities such as electro encephalography (EEG) (Fazli et al, 2012; Lareau et al, 2011; Moosmann et al, 2003; Obrig et al, 2002; Wallois et al, 2012) or functional magnetic resonance imaging (fMRI)(Cooper et al, 2012; Mehagnoul-Schipper et al, 2002; Strangman et al, 2002), and for its v) portability (Atsumori et al, 2007; Bozkurt et al, 2005; Kiguchi et al, 2012; Muehlemann et al, 2008; Vaithianathan, 2004). …”

Section: Introductionmentioning

confidence: 99%

“…Following this tendency, there is great interest in portable NIRS systems with an increasing number of measurement channels (Atsumori et al, 2009; Kiguchi et al, 2012; Vaithianathan, 2004) and possibly hybrid portable NIRS-EEG systems (Lareau et al, 2011). …”

Section: Introductionmentioning

confidence: 99%

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A wearable multi-channel fNIRS system for brain imaging in freely moving subjects

et al. 2014

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Functional near infrared spectroscopy (fNIRS) is a versatile neuroimaging tool with an increasing acceptance in the neuroimaging community. While often lauded for its portability, most of the fNIRS setups employed in neuroscientific research still impose usage in a laboratory environment. We present a wearable, multi-channel fNIRS imaging system for functional brain imaging in unrestrained settings. The system operates without optical fiber bundles, using eight dual wavelength light emitting diodes and eight electro-optical sensors, which can be placed freely on the subject's head for direct illumination and detection. Its performance is tested on N = 8 subjects in a motor execution paradigm performed under three different exercising conditions: (i) during outdoor bicycle riding, (ii) while pedaling on a stationary training bicycle, and (iii) sitting still on the training bicycle. Following left hand gripping, we observe a significant decrease in the deoxyhemoglobin concentration over the contralateral motor cortex in all three conditions. A significant task-related ΔHbO2 increase was seen for the non-pedaling condition. Although the gross movements involved in pedaling and steering a bike induced more motion artifacts than carrying out the same task while sitting still, we found no significant differences in the shape or amplitude of the HbR time courses for outdoor or indoor cycling and sitting still. We demonstrate the general feasibility of using wearable multi-channel NIRS during strenuous exercise in natural, unrestrained settings and discuss the origins and effects of data artifacts. We provide quantitative guidelines for taking condition-dependent signal quality into account to allow the comparison of data across various levels of physical exercise. To the best of our knowledge, this is the first demonstration of functional NIRS brain imaging during an outdoor activity in a real life situation in humans.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A wearable multi-channel fNIRS system for brain imaging in freely moving subjects

et al. 2014

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“…Early approaches used optical sources (typically LEDs) and detectors (typically photodiodes) coupled directly to the scalp, with the associated analogue signals being transferred via electrical cabling to a controller module [17–19]. This approach is clearly limited, as not only is the cabling itself cumbersome, the transfer of analogue data in this manner often leads to issues with RF noise.…”

Section: Introductionmentioning

confidence: 99%

Functional imaging of the human brain using a modular, fibre-less, high-density diffuse optical tomography system

Chitnis¹,

Cooper²,

Dempsey³

et al. 2016

Biomed. Opt. Express

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We present the first three-dimensional, functional images of the human brain to be obtained using a fibre-less, high-density diffuse optical tomography system. Our technology consists of independent, miniaturized, silicone-encapsulated DOT modules that can be placed directly on the scalp. Four of these modules were arranged to provide up to 128, dual-wavelength measurement channels over a scalp area of approximately 60 × 65 mm2. Using a series of motor-cortex stimulation experiments, we demonstrate that this system can obtain high-quality, continuous-wave measurements at source-detector separations ranging from 14 to 55 mm in adults, in the presence of hair. We identify robust haemodynamic response functions in 5 out of 5 subjects, and present diffuse optical tomography images that depict functional haemodynamic responses that are well-localized in all three dimensions at both the individual and group levels. This prototype modular system paves the way for a new generation of wearable, wireless, high-density optical neuroimaging technologies.

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“…The majority of wearable devices take advantage of light-emitting diodes (LEDs) and photodiodes [19] [20]. Early portable systems used electrical cables, more prone to RF interference, to transfer analog signals to a controller module [21][22], typically held in a backpack. More recent wearable systems implement digital conversion directly in the optode [19] [20].…”

Section: Introductionmentioning

confidence: 99%

Functional Near Infrared Spectroscopy: Enabling routine functional brain imaging

Yücel

Selb

Huppert

et al. 2017

Current Opinion in Biomedical Engineering

149

130

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Functional Near-Infrared Spectroscopy (fNIRS) maps human brain function by measuring and imaging local changes in hemoglobin concentrations in the brain that arise from the modulation of cerebral blood flow and oxygen metabolism by neural activity. Since its advent over 20 years ago, researchers have exploited and continuously advanced the ability of near infrared light to penetrate through the scalp and skull in order to non-invasively monitor changes in cerebral hemoglobin concentrations that reflect brain activity. We review recent advances in signal processing and hardware that significantly improve the capabilities of fNIRS by reducing the impact of confounding signals to improve statistical robustness of the brain signals and by enhancing the density, spatial coverage, and wearability of measuring devices respectively. We then summarize the application areas that are experiencing rapid growth as fNIRS begins to enable routine functional brain imaging.

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Note: Wearable near-infrared spectroscopy imager for haired region

Cited by 23 publications

References 6 publications

A wearable multi-channel fNIRS system for brain imaging in freely moving subjects

A wearable multi-channel fNIRS system for brain imaging in freely moving subjects

Functional imaging of the human brain using a modular, fibre-less, high-density diffuse optical tomography system

Functional Near Infrared Spectroscopy: Enabling routine functional brain imaging

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