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Optical clock signal generation system and method used in OCT (Optical Coherence Tomography) endoscopic scanning imaging system

A scanning imaging and clock signal technology, applied in the fields of endoscopy, application, medical science, etc., can solve the problems of lower image clarity, greater detection sensitivity attenuation, and lower signal-to-noise ratio

Inactive Publication Date: 2015-08-12
MICRO TECH (NANJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a sampling and signal processing method has high requirements on the sampling system and digital signal processing system, and will also obtain a lot of redundant information, thereby increasing the burden on the storage system
In addition, digital resampling will also cause a decrease in the signal-to-noise ratio, and lead to a greater attenuation of detection sensitivity, resulting in a decrease in image clarity

Method used

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  • Optical clock signal generation system and method used in OCT (Optical Coherence Tomography) endoscopic scanning imaging system
  • Optical clock signal generation system and method used in OCT (Optical Coherence Tomography) endoscopic scanning imaging system
  • Optical clock signal generation system and method used in OCT (Optical Coherence Tomography) endoscopic scanning imaging system

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1As shown, an optical clock module used in an OCT endoscopic scanning imaging system includes an interference module, a detector module and an optical clock conversion circuit module, and the optical clock conversion circuit module includes a broadband 90-degree phase shifter, a A circuit composed of a zero comparator, an exclusive OR gate, and an OR gate, and an optical clock signal output module. Among them, the interference module adopts an all-fiber Mach-Zehnder interferometer (MZI) structure, which is mainly composed of two fiber couplers, and the second coupler is a symmetrical 2×2 fiber coupler. The two paths of light respectively pass through two sections of the first optical fiber and the second optical fiber with fixed optical path differences, and interfere at the second optical fiber coupler. The detector module consists of a high-speed balanced photodetector, which is mainly used to convert the interference optical signal output from the int...

Embodiment 2

[0049] Such as image 3 As shown, an OCT endoscopic scanning imaging system includes a frequency-sweeping laser module, an optical clock module, a data acquisition module, a data processing module, an image display module, an actuator, an OCT microprobe, a balloon catheter, and inflation and deflation equipment, Wherein: the optical clock module such as figure 1 As shown, it includes an interference module, a detector module and an optical clock conversion circuit module. The optical clock conversion circuit module includes a wide-band 90-degree phase shifter, a zero-crossing comparator, an exclusive OR gate, and a circuit composed of an OR gate and an optical clock signal Output module, after the optical interference signal generated by MZI is converted into an electrical signal by a balanced photodetector, it is converted into a frequency-domain A uniform, frequency-up-varying optical clock signal in the time domain, or a gate to combine the real optical clock signal with t...

Embodiment 3

[0052] An OCT endoscopic scanning imaging system, similar to Embodiment 2, the difference is that the OCT micro-probe is as follows Figure 4 and Figure 5 As shown: the single-mode optical fiber 1 is set in the spring tube 2. The spring tube 2 effectively protects the fragile optical fiber and reduces the resistance when the probe rotates; Obliquely glued with the single-mode fiber 1, the working distance of the OCT probe can be changed by changing the glued distance between the glass rod 3 and the two end faces of the single-mode fiber 1 to achieve the desired working distance, thereby improving the numerical aperture and lateral direction of the OCT probe resolution; the reflector 5 is a cylindrical reflector and is packaged in a slotted stainless steel tube 6, and the reflective surface of the reflector 5 faces the slotted opening of the slotted stainless steel tube 6, so that the light source passing through the cylindrical inner tube can be reduced Effect of astigmatism...

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Abstract

The invention provides an optical clock module and a signal generation method thereof used in an OCT (Optical Coherence Tomography) endoscopic scanning imaging system. The optical clock module comprises an interference module, a detector module and an optical clock conversion circuit module, wherein the optical clock conversion circuit module comprises a wideband 90-degree phase shifter, a zero-crossing comparator, a circuit formed by an exclusive-OR gate and an OR gate, and an optical clock signal output module. The invention also provides the OCT endoscopic scanning imaging system comprising the optical clock module. According to the invention, the conversion from an MZI (Mach Zehnder Interferometer) optical interference signal to an optical clock signal with uniformity on frequency domain and frequency variation on time domain is realized, the requirement on a sampling and processing system is reduced, the collection of redundant information is reduced, and the load of a storage system is reduced, so that the integration level of the whole OCT system is improved, and the system cost is reduced.

Description

technical field [0001] The present invention relates to the field of frequency-sweeping laser technology and the field of optical coherence tomography imaging, in particular to an optical coherence tomography imaging system applied to frequency-sweeping lasers, and provides a system that can effectively reduce the amount of total sampling data and simplify subsequent digital imaging. Optical clock signal generation system and method for signal processing requirements. Background technique [0002] Optical Coherence Tomography (OCT) has been widely used in the field of ophthalmology diagnosis. This technology is based on the science of optics, electronics and computer technology. OCT has attracted people's attention due to its advantages of high resolution and high-speed imaging, and has begun to be valued and applied in the fields of biomedicine and clinical diagnosis. [0003] Compared with other imaging methods such as CT, ultrasound, and MRI, OCT has extremely high resol...

Claims

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Application Information

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IPC IPC(8): A61B1/04A61B1/05A61B1/273
CPCA61B1/00004A61B1/00013A61B1/05A61B1/07A61B1/273A61B5/0066A61B1/04
Inventor 奚杰峰李常青冷德嵘
Owner MICRO TECH (NANJING) CO LTD
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