Spectral coverage OCT imaging method based on optical scanning delay line and the system

An optical scanning and imaging system technology, applied in the field of spectral domain OCT imaging methods and systems, can solve problems such as poor real-time performance of software dispersion compensation algorithms, achieve compactness and reliability, eliminate coherent noise, and eliminate phase shift errors. Effect

Inactive Publication Date: 2007-09-26
ZHEJIANG UNIV
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Problems solved by technology

However, due to the limitations of the iterative algorithm, the real-time performance of the software dispersion compensation algorithm is not good, and the software dispersion compensation algorithm can only compensate the system dispersion within a small range

Method used

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  • Spectral coverage OCT imaging method based on optical scanning delay line and the system
  • Spectral coverage OCT imaging method based on optical scanning delay line and the system
  • Spectral coverage OCT imaging method based on optical scanning delay line and the system

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with drawings and embodiments.

[0028] As shown in Figure 1, the present invention comprises a broadband light source 1, an optical isolator 2, a broadband fiber coupler 3, four polarization controllers 4, a scanning probe 22, a detection unit 24 and an optical scanning delay line 23; The low-coherence light is incident on the broadband fiber coupler 3 through the first polarization controller 4 and the optical isolator 2, and after splitting, one path passes through the second polarization controller 4 and enters the reference arm formed by the optical scanning delay line 23, and the other path passes through The third polarization controller 4 enters the scanning probe 22 , and the two returned light interferences pass through the fourth polarization controller 4 to connect to the detection unit 24 , and finally processed by the computer 21 to reconstruct the image.

[0029] The scanning probe 22: i...

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Abstract

The invention discloses a spectrum OCT (optical coherent tomography) image method and relative system based on optical scanning delay line, wherein it arranges an optical scanning delay line in a reference arm of a spectrum OCT system, to realize scatter-free phase shift of reference light and system scatter compensation. And when guides in optical scanning delay line based on double gratings, the invention can generate group speed scatter and third-order scatter formed by any marks in large change range, to accurately match the scatters of reference arm and sample arm in spectrum OCT system. The scatter-free phase shift and scatter compensation can assure the axial resolution ratio of spectrum OCT system, eliminate coherent noise, and expand the image depth for one time. The invention is significant for dual-spectrum OCT system with ultra-high resolution ratio.

Description

technical field [0001] The invention relates to optical coherence tomography (OCT) technology, in particular to a spectral domain OCT imaging method and system based on optical scanning delay lines. Background technique [0002] Optical coherence tomography (OCT) is an emerging optical imaging technology that can realize non-contact, non-invasive, high-resolution imaging of the tissue structure and physiological functions inside the living body, and can be used for early detection of diseases. And in the field of body biopsy has a wide range of applications. [0003] The spectral domain OCT system uses a high-speed CCD to collect the spectral components of the interference signal in parallel, and can obtain the depth information of the sample without axial scanning, which has the characteristics of fast and high sensitivity. However, the disadvantage of spectral domain OCT lies in its inherent coherent noise such as mutual interference signals between layers of the sample a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00G03B42/00
Inventor 丁志华王凯孟婕黄刚吴彤
Owner ZHEJIANG UNIV
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