Method and system for expanding dynamic range in tomography of optical coherent

An optical coherence tomography, dynamic range technology, applied in optical radiation measurement, spectrometry/spectrophotometry/monochromator, medical science, etc. Portability, impressive results

Inactive Publication Date: 2007-02-21
ZHEJIANG UNIV
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However, multiple exposures before and after will inevitably increase the mea

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  • Method and system for expanding dynamic range in tomography of optical coherent
  • Method and system for expanding dynamic range in tomography of optical coherent
  • Method and system for expanding dynamic range in tomography of optical coherent

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[0028] The present invention will be further explained below in conjunction with the drawings:

[0029]The shallow area of ​​the sample is a high-illuminance area, especially the surface layer will have a strong interface reflection phenomenon; and the deep area, especially in the area close to the penetration depth limit, is a low-illuminance area. When detecting the interference spectrum corresponding to the shallow area, the detector is easy to saturate, while the deep area will be submerged in noise due to underexposure. If the interference spectrum signal light is divided into two beams with very different intensities during detection, the detection of the strong beam can still retain the information of the deep region, while the detection of the weak beam is used to obtain the information of the shallow region. According to a certain principle, by combining these two images with different exposures, it is possible to obtain all the detailed information from the shallow to th...

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Abstract

A method and system for widening the dynamic range of optical coherent tomography (OCT) is disclosed. Said method includes such steps as using a spectroscopic plate with high spectroscopic ratio at the detecting arm for splitting the coherent spectral signal, acquiring the spectral signals by the plane-array CCD detector respectively, one-dimension Fourier transform to obtain two OCT images with different exposures, and digital synthesis to obtain one OCT image with widened dynamic range.

Description

Technical field [0001] The invention relates to a method and system for expanding the dynamic range of optical coherence tomography, in particular to a method and system for expanding the dynamic range of optical coherence tomography by a digital image synthesis method based on the gray-scale recognition characteristics of human eyes. Background technique [0002] Optical Coherence Tomography (Optical Coherence Tomography, OCT for short) is a tomography technology developed in recent years, which can achieve non-contact, damage-free, high-resolution imaging of the internal tissue structure and physiological functions of the living body. It is widely used in the field and clinical diagnosis, and will also play an important role in materials science and basic research. [0003] In the OCT system based on the point detector, the typical value of the dynamic range of the OCT image is between 60 and 100 dB, and some are even as high as 120 dB. However, in the parallel OCT system based...

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Application Information

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IPC IPC(8): A61B5/00G01N21/45G01J3/00G06F19/00
Inventor 杨亚良丁志华
Owner ZHEJIANG UNIV
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