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Method and system of raising longitudinal resolution of optical coherent chromatographic imaging

A technology of optical coherence tomography and longitudinal resolution, applied in the field of medical instruments, can solve the problems of reduced coherence length, inconvenient operation, unsuitable medical OCT light source, etc., and achieve the effect of improving longitudinal resolution

Inactive Publication Date: 2002-12-11
TSINGHUA UNIV
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Problems solved by technology

All these methods are only suitable for OCT systems using femtosecond lasers as light sources
However, femtosecond lasers are not suitable for medical OCT light sources due to their high price and inconvenient operation.
[0004] The light source of the medical OCT system mainly uses a superluminescent diode SLD, and its coherence length depends on the fabrication of the SLD. At present, there is no other method to reduce the coherence length after its fabrication is completed.

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  • Method and system of raising longitudinal resolution of optical coherent chromatographic imaging
  • Method and system of raising longitudinal resolution of optical coherent chromatographic imaging
  • Method and system of raising longitudinal resolution of optical coherent chromatographic imaging

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[0023] Theoretical analysis shows that there is a relationship between the coherence length l of the light source and the coherence time τ, l=cτ, where c is the speed of light. The coherence time of the light source and the light source spectrum have a Fourier transform relationship with each other. In this way, changing the shape of the light source spectrum, that is, changing the coherence time and coherence length of the light source, also changes the longitudinal resolution of the OCT system, achieving the goal of clearer imaging.

[0024] The spectral shape of a general light source is Gaussian, as long as the middle high part is weakened to make it flat, the purpose of changing the spectral shape is achieved. Theoretical analysis and experiments show that in this way, the longitudinal resolution of the new OCT system can be obtained as the original 0.7.

[0025] figure 1 Schematic diagram of the device for changing the spectral shape. The input light is a parallel bea...

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Abstract

The present invention relates to the optical coherent tomographic (OCT) imaging technology. Technologically, the present invention features that longitudinal resolution of OCT is raised through either utilziing dispersive element or blocking element to change the spectrum shape of input light source or utilizing one blocking element to change the spectrum shape of reference arm returned light. The present invention may be used for the OCT system with femoto second-level laser or SLD light source. The method is simple and may be used to raise the longitudinal resolution of OCT system for 20 microsecond to 14 microsecond.

Description

technical field [0001] The invention relates to an optical coherence tomography technology, in particular to a method for improving the longitudinal resolution of an optical coherence tomography (OCT) by changing the spectral shape, and belongs to the technical field of medical instruments. Background technique [0002] Optical coherence tomography (Optical Coherence Tomography, OCT for short) is a new technology developed in recent years. Damage, clear imaging and other advantages. OCT technology is widely used in the medical field, and can be used for early diagnosis of some diseases in ophthalmology, dermatology, esophagus and stomach. It is also widely used in materials and basic research. [0003] Improving the resolution of OCT instruments has always been a concern of researchers and users. The longitudinal resolution of an OCT instrument depends on the coherence length of the light source used. Therefore, the only way to improve the longitudinal resolution of the ...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61B6/03G01N21/45
Inventor 薛平孙汕郭继华
Owner TSINGHUA UNIV
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