中国物理B ›› 2021, Vol. 30 ›› Issue (12): 124210-124210.doi: 10.1088/1674-1056/ac2804

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Refocusing and locating effect of fluorescence scattering field

Jian-Gong Cui(崔建功)1, Ya-Xin Yu(余亚鑫)1, Xiao-Xia Chu(楚晓霞)1, Rong-Yu Zhao(赵荣宇)1, Min Zhu(祝敏)1, Fan Meng(孟凡)2,†, and Wen-Dong Zhang(张文栋)1   

  1. 1 State Key Laboratory of Dynamics Testing Technology, North University of China, Taiyuan 030051, China;
    2 The School of Information Science and Technology, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
  • 收稿日期:2021-07-21 修回日期:2021-09-14 接受日期:2021-09-18 出版日期:2021-11-15 发布日期:2021-11-30
  • 通讯作者: Fan Meng E-mail:mengfan3426@126.com
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2019YFC0119800), the Youth Talent Support Program of Universities of Hebei Province, China (Grant No. BJ2021038), the National Natural Science Foundation of China (Grant No. 12004265), the Natural Science Foundation of Hebei Province, China (Grant No. A2020210001), and the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China (Grant No. 2019L0541).

Refocusing and locating effect of fluorescence scattering field

Jian-Gong Cui(崔建功)1, Ya-Xin Yu(余亚鑫)1, Xiao-Xia Chu(楚晓霞)1, Rong-Yu Zhao(赵荣宇)1, Min Zhu(祝敏)1, Fan Meng(孟凡)2,†, and Wen-Dong Zhang(张文栋)1   

  1. 1 State Key Laboratory of Dynamics Testing Technology, North University of China, Taiyuan 030051, China;
    2 The School of Information Science and Technology, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
  • Received:2021-07-21 Revised:2021-09-14 Accepted:2021-09-18 Online:2021-11-15 Published:2021-11-30
  • Contact: Fan Meng E-mail:mengfan3426@126.com
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2019YFC0119800), the Youth Talent Support Program of Universities of Hebei Province, China (Grant No. BJ2021038), the National Natural Science Foundation of China (Grant No. 12004265), the Natural Science Foundation of Hebei Province, China (Grant No. A2020210001), and the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China (Grant No. 2019L0541).

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摘要： Optical imaging deep inside scattering medium has always been one of the challenges in the field of bioimaging, which significantly drawbacks the employment of con-focal microscopy system. Although a variety of feedback techniques, such as acoustic or nonlinear fluorescence-based schemes have realized the refocusing of the coherent light, the problems of non-invasively refocusing and locating of linearly-excited fluorescent beads inside the scattering medium have not been thoroughly explored. In this paper, we linearly excited the fluorescent beads inside a scattering medium by using our homemade optical con-focal system, collected the fluorescence scattering light as the optimized target, and established a theoretical model of target contrast enhancement, which is consistent with the experimental data. By improving both the cost function and variation rate within the genetic algorithm, we could refocus the fluorescence scattering field while improving the contrast enhancement factor to 12.8 dB. Then, the positions of the fluorescent beads are reconstructed by sub-pixel accuracy centroid localization algorithm, and the corresponding error is no more than 4.2 μ with several fluorescent beads within the field of view. Finally, the main factors such as the number of fluorescent beads, the thickness of the scattering medium, the modulating parameter, the experimental noise and the system long-term stability are analyzed and discussed in detail. This study proves the feasibility of reconstructing fluorescent labeled cells inside biological tissues, which provides certain reference value for deep imaging of biological tissues.

关键词: optical focusing, bioimaging, genetic algorithm, centroid locating

Abstract: Optical imaging deep inside scattering medium has always been one of the challenges in the field of bioimaging, which significantly drawbacks the employment of con-focal microscopy system. Although a variety of feedback techniques, such as acoustic or nonlinear fluorescence-based schemes have realized the refocusing of the coherent light, the problems of non-invasively refocusing and locating of linearly-excited fluorescent beads inside the scattering medium have not been thoroughly explored. In this paper, we linearly excited the fluorescent beads inside a scattering medium by using our homemade optical con-focal system, collected the fluorescence scattering light as the optimized target, and established a theoretical model of target contrast enhancement, which is consistent with the experimental data. By improving both the cost function and variation rate within the genetic algorithm, we could refocus the fluorescence scattering field while improving the contrast enhancement factor to 12.8 dB. Then, the positions of the fluorescent beads are reconstructed by sub-pixel accuracy centroid localization algorithm, and the corresponding error is no more than 4.2 μ with several fluorescent beads within the field of view. Finally, the main factors such as the number of fluorescent beads, the thickness of the scattering medium, the modulating parameter, the experimental noise and the system long-term stability are analyzed and discussed in detail. This study proves the feasibility of reconstructing fluorescent labeled cells inside biological tissues, which provides certain reference value for deep imaging of biological tissues.

Key words: optical focusing, bioimaging, genetic algorithm, centroid locating

中图分类号:  (Imaging and optical processing)

  • 42.30.-d
42.30.Va (Image forming and processing)