线性偏振光学相干断层扫描技术的发展及猪肌腱双折射测量

Development of Linearly Polarized Optical Coherence Tomography and the measurement on Porcine Tendon Birefringence.

作者信息

Kuo Wen-Chuan, Huang Huan-Jang, Lai Chih-Ming, Chou Chien

机构信息

Institute of Electrto-optical Science and Technology, National Taiwan Normal University, Taipei 116, Taiwan.

出版信息

Conf Proc IEEE Eng Med Biol Soc. 2005;2005:3192-5. doi: 10.1109/IEMBS.2005.1617154.

DOI:10.1109/IEMBS.2005.1617154

PMID:17282923

Abstract

A novel polarization-sensitive optical coherence tomography (PS-OCT) using only linearly polarized light is proposed. To compare with conventional PS-OCT which use circular polarized incident light, linear PS-OCT shows three advantages: (1) in a turbid medium with linear birefringence, the degree of polarization of backscattered light for linearly incident light dose not change significantly; (2) Phase retardation (PR) of the sample can be obtained totally from the phase-difference between the polarization heterodyne signals, thus common phase noise rejection mode is introduced inherently. These advantages lead to the immunity of background phase noise and laser frequency noise simultaneously, and also lead to the better sensitivity of PR measurements; (3) the dynamic range of PR in this system is between 0° to 180°, which is two times larger than that of conventional circular PS-OCT.

摘要

提出了一种仅使用线偏振光的新型偏振敏感光学相干断层扫描（PS-OCT）技术。与使用圆偏振入射光的传统PS-OCT相比，线性PS-OCT具有三个优点：（1）在具有线性双折射的浑浊介质中，线偏振入射光的后向散射光的偏振度变化不明显；（2）样品的相位延迟（PR）可以完全从偏振外差信号之间的相位差中获得，从而固有地引入了共相位噪声抑制模式。这些优点使得系统同时具有背景相位噪声和激光频率噪声免疫能力，并且还能实现更好的PR测量灵敏度；（3）该系统中PR的动态范围在0°至180°之间，是传统圆形PS-OCT的两倍。