Dr. Toru Yamada Profile

Dr. Toru Yamada

Senior research scientist at AIST

SPIE Involvement:

Author

Publications (17)

Proceedings Article | 15 March 2023 Poster + Paper

Wearable fNIRS device of higher spatial resolution realized by triangular arrangement of dual-purpose optodes

Toru Yamada, Hiroshi Kawaguchi, Jun Watabe, Mitsuo Ohashi

Proceedings Volume 12365, 123650C (2023) https://doi.org/10.1117/12.2649791

KEYWORDS: Hemodynamics, Head, Spatial resolution, Signal detection, Cerebral cortex, Functional near infrared spectroscopy, Neuroimaging, Diffuse optical spectroscopy, Brain imaging

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Proceedings Article | 7 March 2023 Presentation + Paper

Determination of the absorption and reduced scattering coefficients by CW spatially resolved spectroscopy with long source-detector distances at high and low internal reflection

Yukio Yamada, Hiroshi Kawaguchi, Toru Yamada

Proceedings Volume 12376, 1237602 (2023) https://doi.org/10.1117/12.2649917

KEYWORDS: Internal reflection, Diffuse reflectance spectroscopy, Reflectivity, Numerical simulations, Scattering, Optical properties, Absorption, Photon transport

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SPIE Journal Paper | 5 August 2020 Open Access

Exclusive detection of cerebral hemodynamics in functional near-infrared spectroscopy by reflectance modulation of the scalp surface

Hiroshi Kawaguchi, Yukari Tanikawa, Toru Yamada

JBO, Vol. 25, Issue 08, 087001, (August 2020) https://doi.org/10.1117/12.10.1117/1.JBO.25.8.087001

KEYWORDS: Absorption, Reflectivity, Hemodynamics, Tissue optics, Mirrors, Absorbance, Modulation, Natural surfaces, Tissues

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Proceedings Article | 1 March 2019 Presentation + Paper

An fNIRS probe positioning system using augmented reality technology

Hiroshi Kawaguchi, Toru Yamada

Proceedings Volume 10874, 108741H (2019) https://doi.org/10.1117/12.2510731

KEYWORDS: Head, Brain, Video, Magnetic resonance imaging, Augmented reality, Cameras, 3D image processing, Neuroimaging, Prototyping, Near infrared spectroscopy, Neurophotonics, Machine learning

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Proceedings Article | 17 February 2017 Paper

Design and fabrication of a multi-layered solid dynamic phantom: validation platform on methods for reducing scalp-hemodynamic effect from fNIRS signal

Hiroshi Kawaguchi, Yukari Tanikawa, Toru Yamada

Proceedings Volume 10059, 1005925 (2017) https://doi.org/10.1117/12.2250485

KEYWORDS: Optical phantoms, Functional near infrared spectroscopy, Brain, Transmittance, Hemodynamics, Reflectivity, Absorption, Scattering, Tissues, Sensors, Absorbance

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Proceedings Article | 8 February 2017 Paper

Method for leveling the signal-to-noise ratio in multichannel functional near-infrared spectroscopy

Toru Yamada, Shinji Umeyama, Atsushi Kamoshida

Proceedings Volume 10051, 1005118 (2017) https://doi.org/10.1117/12.2250239

KEYWORDS: Signal to noise ratio, Sensors, Near infrared spectroscopy, Signal detection, Optical attenuators, Modulation, Attenuators, Interference (communication), Tissues, Optical phantoms

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Proceedings Article | 8 February 2017 Paper

Functional near infrared spectroscopy for awake monkey to accelerate neurorehabilitation study

Hiroshi Kawaguchi, Noriyuki Higo, Junpei Kato, Keiji Matsuda, Toru Yamada

Proceedings Volume 10051, 1005117 (2017) https://doi.org/10.1117/12.2250080

KEYWORDS: Hemodynamics, Functional near infrared spectroscopy, Magnetic resonance imaging, Tissue optics, Near infrared spectroscopy, Brain, Computer simulations, Diffusion, Head, Sensors, Skull, Tissues, Image segmentation, Finite element methods, Geometrical optics

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Proceedings Article | 9 December 2015 Paper

Real-time system for extracting and monitoring the cerebral functional component during fNIRS measurements

Toru Yamada, Mitsuo Ohashi, Shinji Umeyama

Proceedings Volume 9792, 979219 (2015) https://doi.org/10.1117/12.2204771

KEYWORDS: Near infrared spectroscopy, Signal detection, Hemodynamics, Blood circulation, Tissue optics, Real-time computing, Head, Tissues, Data analysis, Diffuse optical imaging, Functional near infrared spectroscopy, Software development, Switches, Human subjects, Brain

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Proceedings Article | 1 July 2015 Paper

Development of a fiber-less fNIRS system and its application to hair-covered head

Toru Yamada, Mitsuo Ohashi, Shinji Umeyama

Proceedings Volume 8928, 89280R (2015) https://doi.org/10.1117/12.2036155

KEYWORDS: Hemodynamics, Head, Sensors, Optical fibers, Signal detection, Near infrared spectroscopy, Light emitting diodes, Reliability, Motion measurement, Avalanche photodiodes

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Proceedings Article | 5 March 2014 Paper

Precise spatial co-registration in simultaneous fNIRS and fMRI measurements using markers coaxially fixable to the optodes

Toru Yamada, Keiji Matsuda, Takayuki Iwano, Shinji Umeyama

Proceedings Volume 8928, 89280S (2014) https://doi.org/10.1117/12.2036165

KEYWORDS: Functional magnetic resonance imaging, Magnetic resonance imaging, Hemodynamics, Near infrared spectroscopy, Solids, 3D image processing, Blood, Head, Image registration, Liquids

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SPIE Journal Paper | 3 April 2013 Open Access

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

Shinji Umeyama, Toru Yamada

JBO, Vol. 18, Issue 04, 047003, (April 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.4.047003

KEYWORDS: Absorbance, Linear filtering, Sensors, Transmittance, Near infrared spectroscopy, Head, Absorption, Mass attenuation coefficient, Fluctuations and noise, Optical filters

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Proceedings Article | 24 February 2010 Paper

A multidistance probe arrangement NIRS for detecting absorption changes in cerebral gray matter layer

Toru Yamada, Shinji Umeyama, Keiji Matsuda

Proceedings Volume 7557, 75570X (2010) https://doi.org/10.1117/12.841559

KEYWORDS: Absorption, Sensors, Scattering, Head, Hemodynamics, Signal detection, Skull, Monte Carlo methods, Signal attenuation, Tissues

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SPIE Journal Paper | 1 November 2009 Open Access

Monte Carlo study of global interference cancellation by multidistance measurement of near-infrared spectroscopy

Shinji Umeyama, Toru Yamada

JBO, Vol. 14, Issue 06, 064025, (November 2009) https://doi.org/10.1117/12.10.1117/1.3275466

KEYWORDS: Monte Carlo methods, Near infrared spectroscopy, Absorption, Hemodynamics, Sensors, Scattering, Error analysis, Skull, Absorbance, Matrices

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SPIE Journal Paper | 1 November 2009 Open Access

Multidistance probe arrangement to eliminate artifacts in functional near-infrared spectroscopy

Toru Yamada, Shinji Umeyama, Keiji Matsuda

JBO, Vol. 14, Issue 06, 064034, (November 2009) https://doi.org/10.1117/12.10.1117/1.3275469

KEYWORDS: Sensors, Absorption, Hemodynamics, Signal attenuation, Scattering, Near infrared spectroscopy, Monte Carlo methods, Skull, Signal detection, Head

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SPIE Journal Paper | 1 September 2009 Open Access

New method of estimating wavelength-dependent optical path length ratios for oxy- and deoxyhemoglobin measurement using near-infrared spectroscopy

Shinji Umeyama, Toru Yamada

JBO, Vol. 14, Issue 05, 054038, (September 2009) https://doi.org/10.1117/12.10.1117/1.3253350

KEYWORDS: Near infrared spectroscopy, Signal to noise ratio, Optical testing, Sensors, Biological research, Biomedical optics, Signal attenuation, Solids, Human subjects, Absorption

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SPIE Journal Paper | 1 May 2009 Open Access

New cross-talk measure of near-infrared spectroscopy and its application to wavelength combination optimization

Shinji Umeyama, Toru Yamada

JBO, Vol. 14, Issue 03, 034017, (May 2009) https://doi.org/10.1117/12.10.1117/1.3147402

KEYWORDS: Skull, Near infrared spectroscopy, Monte Carlo methods, Tissue optics, Signal attenuation, Chromophores, Absorption, Optical testing, Head, Biomedical optics

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Proceedings Article | 24 February 2009 Paper

Multidistance probe arrangement to eliminate motion artifacts in fNIRS

Toru Yamada, Shinji Umeyama, Keiji Matsuda

Proceedings Volume 7174, 717420 (2009) https://doi.org/10.1117/12.808616

KEYWORDS: Sensors, Near infrared spectroscopy, Head, Absorbance, Absorption, Brain, Monte Carlo methods, Signal detection, Blood circulation, Electronic filtering

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Showing 5 of 17 publications

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