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弱相干扫描层析成像系统的三维传递函数分析

向际鹰 吴 震 曾绍群 骆清铭 张 平 黄德修

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弱相干扫描层析成像系统的三维传递函数分析

向际鹰, 吴 震, 曾绍群, 骆清铭, 张 平, 黄德修

ANALYSIS OF 3D TRANSFER FUNCTIONS OF OPTICAL COHERENCE TOMOGRAPHY

XIANG JI-YING, WU ZHEN, ZENG SHAO-QUN, LUO QING-MING, ZHANG PING, HUANG DE-XIU
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  • 导出了考虑离轴、离焦、及弱相干时延区配情况的光学相干层析三维传递函数.以此为基础分析了分辨率的各种影响因素,对系统设计及优化起到了指导作用.结论有:光谱带宽增大时,纵向分辨率将线性提高了,其代价是信号幅度呈现线性下降.对于离焦扫描,大的物镜焦距和小的通光口径虽会造成分辨率在绝对数量上的下降,但对于给定的扫描范围来说,其相对的离焦响应反而得以改善,即可在扫描态范围内得到相对均匀的像质.还给出了实测弱相干波形及图像.
    With the consideratioin of both defocused and abaxial cases,the analytical expressions for the 3D transfer function of optical low coherence tomography are derived in this paper.The theoretical stud-ies are concerned with the resolution-related factors,which furnish evidences for the designation and optimization of the systems.According to our study,the axis resolution would increase linearly with the spectral bandwidth,while the signal level would decrease linearly.In the case of defocused scan-ning,although longer focus length and narrower beam aperture could result in an absolute decrement of the resolution,they give an even better defocused imaging property in the whole scanning region.The detected waveform and the actual image of the optical coherence tomography are also given.
    • 基金项目: 国家自然科学基金(批准号:39570678)资助的课题.
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  • 文章访问数:  6170
  • PDF下载量:  828
  • 被引次数: 0
出版历程
  • 收稿日期:  1998-08-03
  • 修回日期:  1999-02-28
  • 刊出日期:  1999-05-05

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