Simulation of penetration depth of Bessel beams for multifocal optical coherence tomography

Yi Luying; Sun Liqun; Ming Xianshun

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Simulation of penetration depth of Bessel beams for multifocal optical coherence tomography

机译：多焦光学相干断层扫描壁梁渗透深度的仿真

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Multifocal Bessel beam optical coherence tomography (MBOCT) combines the advantages of Bessel beam OCT and multifocal OCT to increase imaging depth. For MBOCT, the penetration depth of the Bessel beam in highly scattering biological tissue limits the final imaging depth. In this paper, we theoretically analyze the penetration depth of the Bessel beams with different parameters to explore which kind of Bessel beam is more suitable for MBOCT in a scattering medium. The finite-difference time-domain method is used to simulate the field distribution of Bessel beams in the medium. We find that the MBOCT for more focus based on a Bessel beam with a smaller Fresnel number N has higher penetration depth and light intensity when its lateral resolution is fixed. Moreover, the Bessel beam with N reversely closer to unity is more advantageous for penetrating the highly scattering medium for a certain imaging depth, and the Bessel beam has larger penetration depth when its lateral size is close to the size of the object to be imaged. (C) 2018 Optical Society of America

机译：多焦点贝塞尔光束光学相干断层扫描（MBOCT）结合了贝塞尔光束OCT和多焦点OCT的优点，以提高成像深度。对于MBOCT，高度散射生物组织中的贝塞尔光束的穿透深度限制了最终的成像深度。在本文中，我们理论上，用不同参数理论地分析贝塞尔光束的穿透深度，以探索散射介质中的哪种贝塞尔光束更适合于MBOCT。有限差分时间域方法用于模拟介质中贝塞尔光束的场分布。我们发现，基于具有较小菲涅耳数N的贝塞尔光束的较高焦点的MBOCT在固定横向分辨率时具有更高的穿透深度和光强度。此外，具有n反向更靠近统一的贝塞尔光束对于穿透特定成像深度的高度散射介质更有利，并且当其横向尺寸接近要成像的物体的尺寸时，贝塞尔光束具有更大的穿透深度。（c）2018年光学学会

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来源
《Applied optics》 |2018年第17期|共6页
作者
Yi Luying; Sun Liqun; Ming Xianshun;
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Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

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Simulation of penetration depth of Bessel beams for multifocal optical coherence tomography

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