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Catheter polarization-sensitive optical coherence tomography system and demodulation method

An optical coherence tomography and imaging system technology, which is applied in the catheter polarization-sensitive optical coherence tomography system and demodulation field, can solve the problem of only obtaining blood vessel intensity information, etc.

Pending Publication Date: 2019-12-20
南京沃福曼医疗科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing OCT catheter optical coherence tomography system can only obtain blood vessel intensity information, and to invent a catheter polarization-sensitive optical coherence tomography system and demodulation method to obtain blood vessel birefringence information, Provide more characteristic information for cardiovascular and cerebrovascular diseases

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  • Catheter polarization-sensitive optical coherence tomography system and demodulation method
  • Catheter polarization-sensitive optical coherence tomography system and demodulation method
  • Catheter polarization-sensitive optical coherence tomography system and demodulation method

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Embodiment 1

[0033] like figure 1 shown.

[0034] A catheter polarization-sensitive optical coherence tomography system such as figure 1As shown, it includes scanning light source 1. The output light of scanning light source 1 enters port 1 of 1:99 fiber coupler 2, and is distributed to sample arm and reference arm from port 2 and port 3 at a ratio of 1:99. 1:99 The output light from port 2 of fiber coupler 2 enters the sample arm, and the light beam entering the sample arm enters the three-ring controller 3 and then enters the polarization-maintaining optical fiber 4 with a length of 18.5 meters, and enters port 1 of the circulator 6 , the light exits from the 2 port of the circulator 6, the outgoing light enters the imaging conduit 11 through the rotating mechanism 8, the light reflected by the sample returns to the circulator 6 from the imaging conduit 11, and exits through the 3 port of the circulator 6. 1:99 The output light from port 3 of fiber coupler 2 enters the reference arm, t...

Embodiment 2

[0037] like Figure 2-4 shown.

[0038] A catheter polarization-sensitive optical coherence tomography demodulation method such as figure 2 As shown, it includes the following steps:

[0039] Step 1: Polarization leveling, on the one hand, make the light intensity of the H path and the V path of the reference light equal in polarization diversity; on the other hand, evenly distribute the light of the sample arm to the two polarization states 13 and 14. The specific steps are as follows: Disconnect the sample arm, first use the polarization controller 9 on the reference arm and the first two polarization controllers of the polarization beam splitter to make the light intensity of the H path and the V path of the reference arm in the polarization diversity set equal to each other. There is monitoring that the light intensity of the H road and the V road are equal. Secondly, connect the sample arm, use the polarization controller 3 in front of the polarization-maintaining fib...

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Abstract

The invention discloses a catheter polarization-sensitive optical coherence tomography system and a demodulation method. The system is characterized in that a fast scanning light source is used as a light source in the system, a polarization maintaining fiber is used to generate delay of an orthogonal polarization state in the system, polarization diversity acquisition is carried out by a polarization beam splitter, and polarization diversity imaging of two orthogonal input polarization states is simultaneously appeared in one image. In the demodulation method, a series of steps such as polarization leveling, background signal cancellation, spectral shaping, dual-state dispersion cancellation, interpolation Fourier transform, reference surface selection, polarization solution, and conversion of a polar coordinate to a Cartesian coordinate are carried out to finally realize vascular birefringence imaging. According to the system and demodulation method, the vascular birefringence information can be obtained, and more characteristic information for cardiovascular and cerebrovascular diseases is provided.

Description

technical field [0001] The present invention relates to catheter optical coherence tomography (Optical Coherence Tomography, OCT) covering cardiovascular, cerebrovascular and other catheter imaging fields, and in particular to a catheter polarization-sensitive OCT (Polarization-sensitive OCT), that is, demodulating samples in PS-OCT images Birefringence information, specifically a catheter polarization-sensitive optical coherence tomography system and demodulation method used in OCT technology. Background technique [0002] Catheter OCT imaging technology is currently the vascular imaging method with the highest image resolution, especially catheter PS-OCT imaging technology, which can solve the medical problem that the stability of atherosclerotic plaque is difficult to judge in vivo, real-time, and quickly, and can improve arterial Prevention and treatment of atherosclerotic diseases. However, the resolution of the existing OCT system has reached the level where it is pos...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61B5/02
CPCA61B5/0066A61B5/0084A61B5/02007A61B5/6852A61B5/7203
Inventor 陈韵岱黄进宇周亮童国新殷聪国陶魁园田峰刘子旭陆维匡皓
Owner 南京沃福曼医疗科技有限公司
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