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

Hiroshi Kawaguchi, Eiji Okada

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

    Abstract

    The poor spatial resolution and reproducibility of the images are disadvantages of near infrared topography. The authors proposed the combination of the double-density probe arrangement and the image reconstruction algorithm using a spatial sensitivity profile to improve the spatial resolution and the reproducibility. However, the proposed method was evaluated only by the simplified adult head model. It is uncertain whether the proposed method is effective to the actual head that has complicated structure. In this study, the proposed method is evaluated by the virtual head phantom the 3Dstructure of which is based upon an MRI scan of an adult head. The absorption change the size of which is almost equivalent to the width of the brain gyri was measured by the conventional method and the proposed method to evaluate the spatial resolution of the topographic images obtained by each method. The positions of the probe arrangements are slightly changed and the topographic images of the same brain activation measured by two probe positions are compared to evaluate the reproducibility of the NIR topography. The results indicate that the combination of the double-density probe arrangement and the image reconstruction algorithm using the spatial sensitivity profile can improve both the spatial resolution and the reproducibility of the topographic image of brain activation in the virtual head phantom. However, the uneven thickness of the superficial tissues affects the accuracy of the position of activation in the images.

    Original languageEnglish
    Title of host publicationEuropean Conference on Biomedical Optics, ECBO 2007
    PublisherOptical Society of America
    ISBN (Print)9780819467713
    Publication statusPublished - 2007 Jan 1
    EventEuropean Conference on Biomedical Optics, ECBO 2007 - Munich, Germany
    Duration: 2007 Jun 172007 Jun 17

    Publication series

    NameOptics InfoBase Conference Papers
    ISSN (Electronic)2162-2701

    Other

    OtherEuropean Conference on Biomedical Optics, ECBO 2007
    CountryGermany
    CityMunich
    Period07/6/1707/6/17

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    Keywords

    • Diffusion equation
    • Finite element method
    • Image reconstruction technique
    • Monte carlo method
    • Near-infrared topography
    • Virtual head phantom

    ASJC Scopus subject areas

    • Instrumentation
    • Atomic and Molecular Physics, and Optics

    Cite this

    Kawaguchi, H., & Okada, E. (2007). Evaluation of image reconstruction algorithm for near infrared topography by virtual head phantom. In European Conference on Biomedical Optics, ECBO 2007 (Optics InfoBase Conference Papers). Optical Society of America.