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Near Infrared Imager with a Flexible Source-Detector Arrangement and a New Detection Gain Control

  • ENVIRONMENTAL, BIOLOGICAL, AND SPACE OPTICS
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Abstract

This paper describes a new near infrared (NIR) spectroscopic imager that has an expanded detection dynamic range intended for measurements with various transmitter-receiver (T-R) distances. Simultaneous multi-distance measurements for 48 points of the human forehead were performed to record brain activation by a mental test called digit span. Similarity Index (SI) analysis of 48 time-course curves was introduced for the evaluation of the result. A new mapping method toward depth direction is also shown for total hemoglobin and SI values. Simultaneous multi-distance measurements are useful for the brain functional analysis to distinguish depth variation.

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Authors and Affiliations

  1. Technology Research Laboratory, Shimadzu Corporation, 3-9-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto, 619-0237, Japan

    Ichiro Oda, Yukihisa Wada, Sadao Takeuchi, Ikuo Konishi & Yoshio Tsunazawa

Authors
  1. Ichiro Oda
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  2. Yukihisa Wada
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  3. Sadao Takeuchi
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  4. Ikuo Konishi
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  5. Yoshio Tsunazawa
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Correspondence to Ichiro Oda or Ikuo Konishi.

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Oda, I., Wada, Y., Takeuchi, S. et al. Near Infrared Imager with a Flexible Source-Detector Arrangement and a New Detection Gain Control. OPT REV 10, 422–426 (2003). https://doi.org/10.1007/s10043-003-0422-z

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  • DOI: https://doi.org/10.1007/s10043-003-0422-z

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