Improvement of scattering suppression effect of time-reversal propagation using digital phase-conjugate light

Sogo Toda, Yuji Kato, Nobuki Kudo, Koichi Shimizu

研究成果: Conference contribution

抜粋

Strong scattering in turbid medium is a severe difficulty for optical imaging and measurement in an animal body. Therefore, the suppression of scattering effect is crucially important in many applications of biomedical optics. In the optical transillumination imaging of an animal body, this effect appears as strong blurring of the image. This blurring poses a fundamentally important difficulty restricting the practical application of transillumination imaging. Therefore, we have attempted to suppress scattering effect using the time-reversal ability of phase-conjugate light. For our previous study, we constructed a digital system to generate light not only with conjugated phase but also with the same intensity distribution as non-scattered signal light. Using this system, we were able to restore the pattern of incident light from the blurred image because of time-reversal propagation of the phase-conjugate light. In comparison to a case with phase information only, we found that addition of the intensity information greatly improves the scattering suppression capability of the time-reversal principle. However, our pilot study showed this ability was valid only for the scattering medium with the optical distance OD less than 1. This report describes the improvement of our measurement system to make the scattering suppression possible for turbid media with OD of more than 1 using a light source with a longer coherence length. Scattering suppression was effective for spatial frequencies of 0.4-1.0 lp/mm through the scattering medium up to OD=1.8.

元の言語English
ホスト出版物のタイトルAdaptive Optics and Wavefront Control for Biological Systems V
編集者Na Ji, Thomas G. Bifano, Sylvain Gigan
出版者SPIE
ISBN(電子版)9781510624146
DOI
出版物ステータスPublished - 2019 1 1
イベントAdaptive Optics and Wavefront Control for Biological Systems V 2019 - San Francisco, United States
継続期間: 2019 2 32019 2 4

出版物シリーズ

名前Progress in Biomedical Optics and Imaging - Proceedings of SPIE
10886
ISSN(印刷物)1605-7422

Conference

ConferenceAdaptive Optics and Wavefront Control for Biological Systems V 2019
United States
San Francisco
期間19/2/319/2/4

ASJC Scopus subject areas

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

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  • これを引用

    Toda, S., Kato, Y., Kudo, N., & Shimizu, K. (2019). Improvement of scattering suppression effect of time-reversal propagation using digital phase-conjugate light. : N. Ji, T. G. Bifano, & S. Gigan (版), Adaptive Optics and Wavefront Control for Biological Systems V [1088613] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; 巻数 10886). SPIE. https://doi.org/10.1117/12.2505213