Prof. Eiji Okada Profile

Prof. Eiji Okada

Professor at Keio Univ

SPIE Involvement:

Conference Program Committee | Author

Publications (63)

Proceedings Article | 20 September 2023 Paper

3D-printed head surface model of a standard brain template for scalp-cortex correlation of fNIRS

Tomohiro Kaneko, Eiji Okada

Proceedings Volume 12608, 126080I (2023) https://doi.org/10.1117/12.3007889

KEYWORDS: Head, 3D modeling, Brain, Natural surfaces, Geometrical optics, 3D imaging standards, Systems modeling, Standards development, Manufacturing, Brain tissue

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Proceedings Article | 9 August 2023 Paper

Monte Carlo modeling of photoacoustic guided technique in scattering media

Joya Arisu, Naoto Yamamura, Keiichi Nakagawa, Shu Takagi, Eiji Okada

Proceedings Volume 12628, 126281Z (2023) https://doi.org/10.1117/12.2670646

KEYWORDS: Refractive index, Anisotropy, Tissues, Monte Carlo methods, Geometrical optics, Photon transport, Photoacoustic spectroscopy, Scattering media, Light scattering, Waveguides

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Proceedings Article | 9 August 2023 Paper

Influence of the heterogeneity of extracerebral tissues on scalp-cortex correlation of fNIRS for infants

Rinka Tachikawa, Eiji Okada

Proceedings Volume 12628, 1262828 (2023) https://doi.org/10.1117/12.2670852

KEYWORDS: Tissues, Image segmentation, Skull, Head, Light scattering, Brain, Spatial resolution, Magnetic resonance imaging, Light absorption, Brain tissue

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SPIE Journal Paper | 31 May 2021 Open Access

Correlating functional near-infrared spectroscopy with underlying cortical regions of 0-, 1-, and 2-year-olds using theoretical light propagation analysis

Lin Cai, Eiji Okada, Yasuyo Minagawa, Hiroshi Kawaguchi

NPh, Vol. 8, Issue 02, 025009, (May 2021) https://doi.org/10.1117/12.10.1117/1.NPh.8.2.025009

KEYWORDS: Brain, Head, Near infrared spectroscopy, Optical properties, Geometrical optics, Tissues, Neurophotonics, Tissue optics, Magnetic resonance imaging, Skull

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Proceedings Article | 11 July 2019 Paper

Influence of optical path length on multi-wavelength measurement of oxy- and deoxy-hemoglobins in the skin

T. Shirai, E. Okada

Proceedings Volume 11074, 110742L (2019) https://doi.org/10.1117/12.2526898

KEYWORDS: Tissue optics, Skin, Geometrical optics, Reflectivity, Diffuse reflectance spectroscopy, Hemodynamics, Tissues, Absorption, Light wave propagation, Electronics

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Proceedings Article | 11 July 2019 Paper

Theoretical analysis of hemodynamic signal from the scalp in time-gated NIRS imaging using null source-detector separation

G. Nakamura, E. Okada

Proceedings Volume 11074, 110740S (2019) https://doi.org/10.1117/12.2526899

KEYWORDS: Signal detection, Near infrared spectroscopy, Hemodynamics, Absorption, Brain, Monte Carlo methods, Geometrical optics, Signal analyzers, Head, Neuroimaging

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Proceedings Article | 11 July 2019 Paper

Time-domain diffuse optical tomography with lp sparsity regularization for thyroid cancer imaging

Shinpei Okawa, Tetsuya Mimura, Hiroyuki Fujii, Hiroshi Kawaguchi, Yukari Tanikawa, Manabu Machida, Eiji Okada, Yoko Hoshi

Proceedings Volume 11074, 1107407 (2019) https://doi.org/10.1117/12.2526886

KEYWORDS: Image restoration, Cancer, Optical properties, Reconstruction algorithms, Algorithm development, Neck, Optical fibers, Diffuse optical tomography, Numerical simulations, Finite element methods

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Proceedings Article | 24 April 2018 Paper

Partial optical path length in the scalp in subject-specific head models for multi-distance probe configuration of near infrared spectroscopy

Taku Yanagisawa, Hiroshi Kawaguchi, Takayuki Obata, Eiji Okada

Proceedings Volume 10711, 107111J (2018) https://doi.org/10.1117/12.2319286

KEYWORDS: Geometrical optics, Head, Near infrared spectroscopy, Signal detection, Brain, Sensors, Blood, Monte Carlo methods, Electronics

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Proceedings Article | 24 April 2018 Paper

Measurement of head phantom by functional near infrared imaging using multi-distance probe configuration

Koki Hayabusa, Eiji Okada

Proceedings Volume 10711, 107111K (2018) https://doi.org/10.1117/12.2319282

KEYWORDS: Signal detection, Absorption, Head, Near infrared, Sensors, Blood, Brain, Neuroimaging

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Proceedings Article | 18 April 2017 Paper

Estimation of functional areas probed by near-infrared spectroscopy instruments

Tomonori Nitta, Ryohei Tsuyuki, Hiroshi Kawaguchi, Eiji Okada

Proceedings Volume 10251, 102511Z (2017) https://doi.org/10.1117/12.2275046

KEYWORDS: Head, Light scattering, Scattering, Tissue optics, Brain activation, Neuroimaging, Imaging spectroscopy, Image registration, Near infrared spectroscopy, Brain

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Proceedings Article | 18 April 2017 Paper

Light propagation analysis for fluorescence measurements of a molecular probe in the brain

Kota Asai, Takuya Togashi, Eiji Okada

Proceedings Volume 10251, 102511S (2017) https://doi.org/10.1117/12.2274896

KEYWORDS: Tissues, Brain, Luminescence, Geometrical optics, Tissue optics, Skull, Head, Natural surfaces, Monte Carlo methods, Molecular electronics, Alzheimer's disease, Light sources

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Proceedings Article | 10 March 2015 Paper

Numerical modeling of photon migration in the cerebral cortex of the living rat using the radiative transport equation

Hiroyuki Fujii, Shinpei Okawa, Ken Nadamoto, Eiji Okada, Yukio Yamada, Yoko Hoshi, Masao Watanabe

Proceedings Volume 9333, 933313 (2015) https://doi.org/10.1117/12.2079265

KEYWORDS: Cerebral cortex, Tissues, Optical properties, Scattering, Monte Carlo methods, Picosecond phenomena, Biomedical optics, Light scattering, Numerical modeling, Numerical analysis

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Proceedings Article | 14 June 2013 Paper

A hybrid MC-FEM model for analysis of light propagation in highly scattering medium

Kazuki Kurihara, Xue Wu, Eiji Okada, Hamid Dehghani

Proceedings Volume 8799, 87990E (2013) https://doi.org/10.1117/12.2032613

KEYWORDS: Photons, Finite element methods, Scattering, Light sources, Light scattering, Near infrared spectroscopy, Monte Carlo methods, Diffusion, Hemodynamics, Head

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Proceedings Article | 14 June 2013 Paper

Three-dimensional cortex model including vascular structure for estimation of path length for optical imaging

Takahiro Kikuchi, Hiroyuki Takuwa, Kazuto Masamoto, Hiroshi Ito, Eiji Okada

Proceedings Volume 8799, 87990M (2013) https://doi.org/10.1117/12.2032509

KEYWORDS: Blood vessels, Geometrical optics, Tissue optics, Tissues, 3D modeling, Sensors, 3D image processing, Optical imaging, Absorption, Two photon excitation microscopy

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Proceedings Article | 25 March 2013 Paper

Near-infrared spectroscopy system with non-contact source and detector for in vivo multi-distance measurement of deep biological tissue

Tsukasa Funane, Hirokazu Atsumori, Masashi Kiguchi, Yukari Tanikawa, Eiji Okada

Proceedings Volume 8578, 85782W (2013) https://doi.org/10.1117/12.2002254

KEYWORDS: Near infrared spectroscopy, Tissue optics, Optical scanning systems, Brain, Sensors, Neuroimaging, Skin, Light, In vivo imaging, Stray light

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SPIE Journal Paper | 5 April 2012 Open Access

Dynamic phantom with two stage-driven absorbers for mimicking hemoglobin changes in superficial and deep tissues

Tsukasa Funane, Hirokazu Atsumori, Masashi Kiguchi, Eiji Okada, Yukari Tanikawa

JBO, Vol. 17, Issue 04, 047001, (April 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.4.047001

KEYWORDS: Absorption, Tissues, Near infrared spectroscopy, Autoregressive models, Independent component analysis, Monte Carlo methods, Aluminum, Brain, Blood, Absorbance

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Proceedings Article | 9 July 2011 Paper

Analysis of the diffuse reflectance spectra of skin due to detection system

Shoji Takano, Eiji Okada

Proceedings Volume 8088, 80881A (2011) https://doi.org/10.1117/12.889241

KEYWORDS: Skin, Laser induced plasma spectroscopy, Diffuse reflectance spectroscopy, Integrating spheres, Absorption, Reflectivity, Monte Carlo methods, Optical properties, Photon transport, Scattering

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Proceedings Article | 17 June 2011 Paper

Evaluation of the position resolution of NIR topography by localised visual stimulation

Hirokazu Kakuta, Eiji Okada

Proceedings Volume 8088, 80881B (2011) https://doi.org/10.1117/12.889798

KEYWORDS: Brain activation, Visualization, Near infrared, Visual cortex, Inverse problems, Inverse optics, Brain, Image resolution, Visual optics, Optical resolution

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Proceedings Article | 17 June 2011 Paper

Segmentation of magnetic resonance images to construct human head model for diffuse optical imaging

Kazuki Kurihara, Hiroshi Kawaguchi, Yosuke Takahashi, Takayuki Obata, Eiji Okada

Proceedings Volume 8088, 80880J (2011) https://doi.org/10.1117/12.889813

KEYWORDS: Image segmentation, Magnetic resonance imaging, Head, Skull, Tissues, Magnetism, Brain, Diffuse optical imaging, Image processing algorithms and systems, Neuroimaging

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Proceedings Article | 15 June 2011 Paper

Phantom experiments for quantitative evaluation of topographic image by mapping algorithm

Yusuke Yoshida, Hirokazu Kakuta, Hiroshi Kawaguchi, Eiji Okada

Proceedings Volume 8088, 80881D (2011) https://doi.org/10.1117/12.889808

KEYWORDS: Brain activation, Absorption, Diamond, Head, Image analysis, Sensors, Brain mapping, Near infrared, Spatial resolution, Monte Carlo methods

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Proceedings Article | 15 June 2011 Paper

Comparison of temporal response to cerebral blood flow measured by laser speckle flowgraphy and laser Doppler flowmetry

Masashi Kusano, Haruka Nakayama, Hiroyuki Takuwa, Kazuto Masamoto, Iwao Kanno, Eiji Okada

Proceedings Volume 8088, 80880E (2011) https://doi.org/10.1117/12.889787

KEYWORDS: Speckle, Speckle pattern, Blood circulation, Doppler effect, CCD cameras, Cerebral blood flow, Temporal resolution, Blood vessels, Brain activation, Somatosensory cortex

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Proceedings Article | 10 July 2009 Paper

Influence of SNR on statistical analysis of spatial extent of brain activation measured by multi-spectral imaging

Naotaka Sakashita, Koichiro Sakaguchi, Satoshi Matsuo, Haruka Nakayama, Takushige Katsura, Kyoko Yamazaki, Naoki Tanaka, Hideo Kawaguchi, Atsushi Maki, Eiji Okada

Proceedings Volume 7369, 73690Z (2009) https://doi.org/10.1117/12.831688

KEYWORDS: Signal to noise ratio, Brain activation, Statistical analysis, Reflectivity, Brain mapping, Optical filters, Signal detection, Beam splitters, Tissue optics, Brain

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Proceedings Article | 10 July 2009 Paper

Measurements of temporal-spatial change in blood flow and volume in exposed cortex of guinea pig evoked by auditory stimulation

Haruka Nakayama, Koichiro Sakaguchi, Satoshi Matsuo, Naotaka Sakashita, Takushige Katsura, Kyoko Yamazaki, Naoki Tanaka, Hideo Kawaguchi, Atsushi Maki, Eiji Okada

Proceedings Volume 7369, 73691G (2009) https://doi.org/10.1117/12.831655

KEYWORDS: Blood circulation, Blood, Imaging systems, Speckle, Tissues, Reflectivity, Speckle pattern, Optical imaging, Brain activation, Laser speckle imaging

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Proceedings Article | 12 July 2007 Paper

Evaluation of image reconstruction algorithm for near infrared topography by virtual head phantom

Hiroshi Kawaguchi, Eiji Okada

Proceedings Volume 6629, 662906 (2007) https://doi.org/10.1117/12.728105

KEYWORDS: Head, Image restoration, Absorption, Reconstruction algorithms, Near infrared, Spatial resolution, Brain activation, Tissues, Sensors, Magnetic resonance imaging

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Proceedings Article | 12 July 2007 Paper

Modeling of influence of frontal sinus on NIRS signal of brain activation

Daisuke Yamamoto, Shoko Kuroda, Eiji Okada

Proceedings Volume 6629, 66290S (2007) https://doi.org/10.1117/12.728255

KEYWORDS: Geometrical optics, Head, Near infrared spectroscopy, Tissues, Brain activation, Skull, Tissue optics, Brain, Absorption, Scattering

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Proceedings Article | 12 July 2007 Paper

Path-length correction for the haemoglobin-concentration measurement using the skull cranial window by multi-spectral imaging analysis

Koichiro Sakaguchi, Shunsuke Furukawa, Takushige Katsura, Kyoko Yamazaki, Hideo Kawaguchi, Atsushi Maki, Eiji Okada

Proceedings Volume 6629, 66290K (2007) https://doi.org/10.1117/12.728225

KEYWORDS: Skull, Tissue optics, Reflectivity, Tissues, Cranial windows, Monte Carlo methods, Brain, Brain activation, Neuroimaging, Geometrical optics

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Proceedings Article | 27 October 2006 Paper

Theoretical analysis of crosstalk in near-infrared topography

E. Okada, N. Okui

Proceedings Volume 6047, 60470V (2006) https://doi.org/10.1117/12.710677

KEYWORDS: Absorption, Brain, Tissue optics, Sensors, Near infrared, Monte Carlo methods, Geometrical optics, Head, Skull, Neuroimaging

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Proceedings Article | 26 October 2005 Paper

Image reconstruction using spatial sensitivity profile with the constraint of spatial frequency in image for near-infrared topography

Hiroshi Kawaguchi, Eiji Okada

Proceedings Volume 5859, 585915 (2005) https://doi.org/10.1117/12.632871

KEYWORDS: Image restoration, Absorption, Reconstruction algorithms, Spatial resolution, Inverse problems, Linear filtering, Head, Spatial frequencies, Near infrared, Sensors

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Proceedings Article | 8 October 2005 Paper

Estimation of path length factor for measurement of haemoglobin concentration in the exposed cortical tissue

K. Sakaguchi, T. Tachibana, K. Yokoyama, S. Furukawa, T. Katsura, A. Maki, H. Kawaguchi, E. Okada

Proceedings Volume 5859, 58590S (2005) https://doi.org/10.1117/12.632848

KEYWORDS: Tissue optics, Reflectivity, Tissues, Monte Carlo methods, Geometrical optics, Brain, Optical properties, Imaging systems, Neuroimaging, CCD cameras

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Proceedings Article | 8 October 2005 Paper

Crosstalk in the measurement of focal brain activation by near-infrared topography

N. Okui, E. Okada

Proceedings Volume 5859, 58591A (2005) https://doi.org/10.1117/12.632876

KEYWORDS: Absorption, Tissue optics, Monte Carlo methods, Skull, Brain activation, Head, Geometrical optics, Near infrared, Light, Brain

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SPIE Journal Paper | 1 January 2005 Open Access

Wavelength dependence of crosstalk in dual-wavelength measurement of oxy- and deoxy-hemoglobin

Nobuhiro Okui, Eiji Okada

JBO, Vol. 10, Issue 01, 011015, (January 2005) https://doi.org/10.1117/12.10.1117/1.1846076

KEYWORDS: Tissue optics, Skull, Geometrical optics, Near infrared spectroscopy, Monte Carlo methods, Head, Tissues, Optical properties, Absorption, Phase measurement

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SPIE Journal Paper | 1 January 2005 Open Access

Interpretation of principal components of the reflectance spectra obtained from multispectral images of exposed pig brain

Kentaro Yokoyama, Motoshi Watanabe, Yohei Watanabe, Eiji Okada

JBO, Vol. 10, Issue 01, 011005, (January 2005) https://doi.org/10.1117/12.10.1117/1.1854671

KEYWORDS: Reflectivity, Tissue optics, Multispectral imaging, Absorption, Tissues, Geometrical optics, Monte Carlo methods, Principal component analysis, Brain, Photons

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Proceedings Article | 29 July 2004 Paper

Modeling of light distribution in the brain for topographical imaging

Eiji Okada, Toshiyuki Hayashi, Hiroshi Kawaguchi

Proceedings Volume 5486, (2004) https://doi.org/10.1117/12.571349

KEYWORDS: Absorption, Brain, Head, Neuroimaging, Sensors, Reconstruction algorithms, Spatial resolution, Scattering, Monte Carlo methods, Light scattering

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Proceedings Article | 15 October 2003 Paper

Evaluation of spatial resolution of near-infrared topography using spatial sensitivity profile

Hiroshi Kawaguchi, Toshiyuki Hayashi, Toshinori Kato, Eiji Okada

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500403

KEYWORDS: Absorption, Reconstruction algorithms, Signal detection, Spatial resolution, Head, Image restoration, Brain activation, Sensors, Brain, Neuroimaging

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Proceedings Article | 15 October 2003 Paper

Functional imaging system for simultaneous measurement of blood volume and flow

Yohei Watanabe, Hitoshi Fujii, Eiji Okada

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500547

KEYWORDS: Blood circulation, Blood, Reflectivity, Tissues, Speckle pattern, Imaging systems, Speckle, CCD cameras, Functional imaging, Laser tissue interaction

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Proceedings Article | 15 October 2003 Paper

Effect of fiber arrangement on spatial resolution of near-infrared topographic imaging

Nobuhiro Okui, Takuma Kadoya, Tsuyoshi Yamamoto, Eiji Okada

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500394

KEYWORDS: Spatial resolution, Head, Near infrared, Light scattering, Scattering, Monte Carlo methods, Brain, Sensors, Tissue optics, Neuroimaging

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Proceedings Article | 15 October 2003 Paper

Estimation of point spread function for scattering effect on cortical tissue image

Motoshi Watanabe, Kentaro Yokoyama, Eiji Okada

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500413

KEYWORDS: Point spread functions, Blood vessels, Tissues, Scattering, Absorption, Tissue optics, Light scattering, Monte Carlo methods, Reflectivity, Optical imaging

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Proceedings Article | 15 October 2003 Paper

Effect of thickness of the superficial tissues on the spatial sensitivity profile for optical imaging

Eiji Okada

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500389

KEYWORDS: Skull, Brain, Tissues, Head, Geometrical optics, Near infrared, Tissue optics, Brain activation, Signal detection, Sensors

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Proceedings Article | 15 October 2003 Paper

Monte Carlo simulation of characteristics of OCT signal from the boundary of optical property mismatch

Masaki Hojo, Eiji Okada

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500437

KEYWORDS: Scattering, Signal detection, Optical coherence tomography, Light scattering, Tissues, Interference (communication), Signal to noise ratio, Monte Carlo methods, Optical properties, Multiple scattering

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Proceedings Article | 15 October 2003 Paper

Estimation of optical path length factor for functional imaging of an exposed cortex by principal component analysis

Kentaro Yokoyama, Motoshi Watanabe, Eiji Okada

Proceedings Volume 5138, (2003) https://doi.org/10.1117/12.500400

KEYWORDS: Tissue optics, Reflectivity, Absorption, Brain, Principal component analysis, Neuroimaging, Monte Carlo methods, Factor analysis, Scattering, Image analysis

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Proceedings Article | 8 October 2003 Paper

Optical property measurement of thin superficial tissue by using time-resolved spectroscopy

Kenji Tanaka, Yukari Tanikawa, Ryuichiro Araki, Yukio Yamada, Eiji Okada

Proceedings Volume 5141, (2003) https://doi.org/10.1117/12.500443

KEYWORDS: Optical properties, Optical testing, Tissue optics, Scattering, Reflectivity, Monte Carlo methods, Diffusion, Tissues, Sensors, Biological research

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Proceedings Article | 29 July 2003 Paper

Optical fiber arrangement of optical topography for spatial resolution improvement

Tsuyoshi Yamamoto, Eiji Okada, Fumio Kawaguchi, Atsushi Maki, Yukio Yamada, Hideaki Koizumi

Proceedings Volume 4955, (2003) https://doi.org/10.1117/12.478126

KEYWORDS: Optical fibers, Spatial resolution, Brain activation, Absorption, Blood, Absorbance, Brain, Near infrared spectroscopy, Optical arrays, Optical properties

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Proceedings Article | 2 November 2001 Paper

Time-resolved spatial sensitivity profiles on the surface of brain cortex

Eiji Okada

Proceedings Volume 4431, (2001) https://doi.org/10.1117/12.447425

KEYWORDS: Photons, Brain, Head, Sensors, Natural surfaces, Tissues, Signal detection, Scattering, Monte Carlo methods, Skull

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Proceedings Article | 2 November 2001 Paper

Hybrid Monte Carlo-diffusion method for light propagation in tissue with low-scattering layer

Toshiyuki Hayashi, Yoshihiko Kashio, Eiji Okada

Proceedings Volume 4431, (2001) https://doi.org/10.1117/12.447417

KEYWORDS: Head, Monte Carlo methods, Light scattering, Scattering, Finite element methods, Brain, Diffusion, Tissue optics, Transmittance, Reflectivity

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Proceedings Article | 2 November 2001 Paper

Optical topographic reconstruction using photon measurement density function

Yoshihiko Kashio, Eiji Okada

Proceedings Volume 4431, (2001) https://doi.org/10.1117/12.447439

KEYWORDS: Brain, Head, Reconstruction algorithms, Neuroimaging, Tissue optics, Absorption, Light scattering, Near infrared, Spatial resolution, Image restoration

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Proceedings Article | 2 November 2001 Paper

Monte Carlo investigation of separation of two absorbers in topographic image

Takuma Kadoya, Eizo Moriwaki, Eiji Okada

Proceedings Volume 4431, (2001) https://doi.org/10.1117/12.447418

KEYWORDS: Monte Carlo methods, Spatial resolution, Light scattering, Scattering, Lithium, Tissue optics, Electronics, Electrical engineering, Optical coherence tomography, Microscopy

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Proceedings Article | 2 November 2001 Paper

Analysis of light propagation in neonatal head model by finite difference method

Yuichi Fukui, Tsuyoshi Yamamoto, Eiji Okada

Proceedings Volume 4431, (2001) https://doi.org/10.1117/12.447420

KEYWORDS: Finite difference methods, Head, Monte Carlo methods, Optical coherence tomography, Microscopy, Geometrical optics, Brain, Tissues

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Proceedings Article | 29 June 2001 Paper

Measuring of optical properties of small volume samples using time-resolved reflectance spectroscopy

Kenji Tanaka, Ryuichiro Araki, Yukio Yamada, Eiji Okada

Proceedings Volume 4250, (2001) https://doi.org/10.1117/12.434498

KEYWORDS: Optical properties, Monte Carlo methods, Scattering, Light scattering, Reflectivity, Tissues, Optical testing, Diffusion, Sensors, Photon transport

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Proceedings Article | 29 June 2001 Paper

Phantom experiment on relationship between activated position of cerebral cortex and NIR signal

Takuma Kadoya, Eiji Okada

Proceedings Volume 4250, (2001) https://doi.org/10.1117/12.434531

KEYWORDS: Absorption, Brain, Sensors, Scattering, Neuroimaging, Near infrared, Light scattering, Spatial resolution, Head, Tissue optics

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Proceedings Article | 29 June 2001 Paper

Monte Carlo analysis of time-resolved spatial sensitivity profiles in realistic head models

Shuhei Eda, Eiji Okada

Proceedings Volume 4250, (2001) https://doi.org/10.1117/12.434518

KEYWORDS: Head, Photons, Scattering, Brain, Monte Carlo methods, Light scattering, Sensors, Tissue optics, Absorption, Near infrared spectroscopy

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Proceedings Article | 29 June 2001 Paper

Adult head modeling based on time-resolved measurement for NIR instrument

Satoshi Misonoo, Eiji Okada

Proceedings Volume 4250, (2001) https://doi.org/10.1117/12.434527

KEYWORDS: Head, Tissue optics, Brain, Optical properties, Geometrical optics, Scattering, Skull, Absorption, Monte Carlo methods, Light scattering

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Proceedings Article | 29 June 2001 Paper

Theoretical study of the detection of activated position in cerebral cortex from NIR signal

Yoshihiko Kashio, Eiji Okada

Proceedings Volume 4250, (2001) https://doi.org/10.1117/12.434483

KEYWORDS: Absorption, Brain, Near infrared, Head, Signal detection, Tissue optics, Sensors, Neuroimaging, Silicon, Imaging spectroscopy

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Proceedings Article | 22 November 2000 Paper

Effect of discrete scatterers in CSF layer on optical path length in the brain

Eiji Okada, David Delpy

Proceedings Volume 4160, (2000) https://doi.org/10.1117/12.407621

KEYWORDS: Brain, Tissue optics, Geometrical optics, Head, Acquisition tracking and pointing, Near infrared spectroscopy, Optical imaging, Modeling, Near infrared, Neuroimaging

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Proceedings Article | 22 November 2000 Paper

Monte Carlo prediction of light propagation in realistic adult head model

Kaori Tajima, Shuhei Eda, Eiji Okada

Proceedings Volume 4160, (2000) https://doi.org/10.1117/12.407607

KEYWORDS: Head, Scattering, Light scattering, Brain, Monte Carlo methods, Tissue optics, Absorption, Natural surfaces, Magnetic resonance imaging, Distortion

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Proceedings Article | 22 November 2000 Paper

Relationship between position of brain activity and change in optical density for NIR imaging

Yoshihiko Kashio, Muneo Ono, Michael Firbank, Martin Schweiger, Simon Arridge, Eiji Okada

Proceedings Volume 4160, (2000) https://doi.org/10.1117/12.407612

KEYWORDS: Brain, Absorbance, Head, Absorption, 3D modeling, Sensors, Finite element methods, Radio propagation, Diffusion, Neuroimaging

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Proceedings Article | 30 December 1998 Paper

Frequency domain Monte Carlo prediction of light propagation in scattering bodies with clear region

Isamu Momose, Eiji Okada

Proceedings Volume 3566, (1998) https://doi.org/10.1117/12.334371

KEYWORDS: Modulation, Monte Carlo methods, Scattering, Phase shift keying, Light scattering, Photon transport, Phase shifts, Reflectivity, Near infrared spectroscopy, Tissue optics

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Proceedings Article | 30 December 1998 Paper

Monte Carlo prediction of mean-time photon measurement density functions

Muneo Ono, Eiji Okada

Proceedings Volume 3566, (1998) https://doi.org/10.1117/12.334367

KEYWORDS: Absorption, Monte Carlo methods, Time metrology, Near infrared spectroscopy, Photon transport, Tissues, Scattering, Brain, Tissue optics

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Proceedings Article | 30 December 1998 Paper

Effect of a nonscattering layer on time-resolved photon migration paths

Eiji Okada, David Delpy

Proceedings Volume 3566, (1998) https://doi.org/10.1117/12.334353

KEYWORDS: Photon transport, Photodetectors, Sensors, Monte Carlo methods, Scattering, Optical properties, Astatine, Time metrology, Tissue optics, Scattering media

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Proceedings Article | 1 January 1998 Paper

Influence of adipose tissue on muscle oxygenation measurement with an NIRS instrument

Kenichi Matsushita, Sachiko Homma, Eiji Okada

Proceedings Volume 3194, (1998) https://doi.org/10.1117/12.301048

KEYWORDS: Near infrared, Tissues, Tissue optics, Monte Carlo methods, Skin, Optical properties, Absorption, Geometrical optics

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Proceedings Article | 1 January 1998 Paper

Monte Carlo investigation of the effect of skull optical properties on optical pathlength in the brain

Eiji Okada, Minobu Saito, Michael Firbank, David Delpy

Proceedings Volume 3194, (1998) https://doi.org/10.1117/12.301064

KEYWORDS: Geometrical optics, Brain, Skull, Optical properties, Bone, Monte Carlo methods, Head, Thermal modeling, Near infrared spectroscopy, Absorption

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Proceedings Article | 18 August 1997 Paper

Effect of local and global absorption perturbation in layered media on NIR signal

Eiji Okada, Michael Firbank, David Delpy

Proceedings Volume 2979, (1997) https://doi.org/10.1117/12.280287

KEYWORDS: Absorption, Signal attenuation, Tissue optics, Head, Near infrared, Brain, Monte Carlo methods, Tissues, Hemodynamics, Skull

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Proceedings Article | 18 December 1995 Paper

Theoretical and experimental investigation of the effect of sulci on light propagation in brain tissue

Eiji Okada, Michael Firbank, Martin Schweiger, Simon Arridge, Mark Cope, David Delpy

Proceedings Volume 2626, (1995) https://doi.org/10.1117/12.228651

KEYWORDS: Brain, Tissue optics, Skull, Head, Monte Carlo methods, Data modeling, Near infrared spectroscopy, Absorption, Geometrical optics, Tissues

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Proceedings Article | 30 May 1995 Paper

Experimental measurements on phantoms and Monte Carlo simulation to evaluate the effect of inhomogeneity on optical pathlength

Eiji Okada, Michael Firbank, Martin Schweiger, Simon Arridge, Jeremy Hebden, Mutsuhisa Hiraoka, David Delpy

Proceedings Volume 2389, (1995) https://doi.org/10.1117/12.209965

KEYWORDS: Tissue optics, Scattering, Absorption, Monte Carlo methods, Near infrared spectroscopy, Tissues, Finite element methods, Optical properties, Brain, Head

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Showing 5 of 63 publications

Conference Committee Involvement (17)