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

Hirokazu Kakuta, Eiji Okada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    Near-infrared (NIR) topography has been applied to the measurement of brain activation. However the position resolution of optical topography is not sufficient to measure focal brain activation. Since the localization of the brain activation in visual cortex depends on the visual stimuli position, it is difficult to resolve the localized brain activation in the visual cortex by NIR topography. In this study, we measured the localised brain activation evoked by visual stimulation to evaluate the position resolution of NIR topography with the high-density probe arrangement. The topographic image is obtained without solving inverse problem to investigate the effect of the high-density probe arrangement on improvement of the position resolution of NIR topography. When the brain activations evoked by the broad visual stimuli such as the whole checker boards, the topographic image measured with the single-density arrangement is almost the same as that with the double-density arrangement. The double-density arrangement effectively improves the topographic image when the brain activations were evoked by the localized visual stimuli such as the fanshaped checker boards.

    Original languageEnglish
    Title of host publicationDiffuse Optical Imaging III
    Publication statusPublished - 2011 Jul 28
    EventDiffuse Optical Imaging III - Munich, Germany
    Duration: 2011 May 222011 May 24

    Publication series

    NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
    ISSN (Print)1605-7422


    OtherDiffuse Optical Imaging III


    • near infrared spectroscopy
    • optical topography
    • visual stimuli

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Biomaterials
    • Atomic and Molecular Physics, and Optics
    • Radiology Nuclear Medicine and imaging


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