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Method and system for processing OCT (Optical Coherence Tomography) signal by using general purpose graphic processing unit

An image processor and signal technology, which is applied in image data processing, 2D image generation, and equipment for radiological diagnosis, etc. It can solve the problems of high-speed OCT systems that cannot realize real-time signal processing, high hardware cost and development cost, and high processing efficiency. Low-level problems, to achieve high-efficiency parallel signal processing capabilities, easy optical imaging, and high portability

Inactive Publication Date: 2015-07-22
MICRO TECH (NANJING) CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

The digital signal processing for the original signal of FD-OCT is a typical single instruction multiple data (SIMD) processing method, but the processing efficiency is low by using a general-purpose CPU, and real-time signal processing cannot be realized for high-speed OCT systems
[0007] In order to perform real-time signal processing for high-speed OCT systems, it is usually necessary to use a dedicated digital signal processing chip to realize this function, and the disadvantages of this method are: 1) high hardware cost and development cost; 2) low portability and 3 ) The processed signal still needs to be transmitted to the image display device through the bus, thereby reducing the efficiency, so there is still a need for improvement

Method used

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  • Method and system for processing OCT (Optical Coherence Tomography) signal by using general purpose graphic processing unit
  • Method and system for processing OCT (Optical Coherence Tomography) signal by using general purpose graphic processing unit
  • Method and system for processing OCT (Optical Coherence Tomography) signal by using general purpose graphic processing unit

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Embodiment 1

[0046] Such as figure 1 As shown, the scheme of utilizing a general-purpose image processor to process OCT signals described in the present invention includes (1) data acquisition connected successively; (2) data transmission; (3) data processing and (4) delivery to image display library several step.

[0047] Among them, due to the relatively slow bus transmission speed during data transmission, while transmitting data, the general-purpose image processor performs parallel processing on the OCT original data last transmitted to the device memory. The parallel transmission and processing process is as follows: figure 2 As shown; the process of data processing is divided into three steps: one-dimensional digital resampling, one-dimensional fast Fourier transform (FFT) and calculation of amplitude and normalization. Implement fast one-dimensional cubic interpolation to improve the accuracy of resampling.

[0048] Such as figure 1 As shown, a scheme using a general-purpose im...

Embodiment 2

[0055] Such as image 3 As shown, an OCT endoscopic scanning imaging system includes a frequency-sweeping laser module, an interference module, a detector module, a data acquisition module, a data processing module, an image display module, an actuator, a balloon catheter, an OCT microprobe and a charging and discharging module. Gas equipment, wherein: the method for processing OCT signals in the OCT endoscopic scanning imaging system is the method described in embodiment 1, wherein:

[0056] The frequency-sweeping laser module includes a high-speed frequency-sweeping laser, a fiber isolator and a fiber coupler, which isolate the optical signal output from the frequency-sweeping laser from the subsequent optical path, preventing the optical signal returned by the subsequent optical path from interfering with the normal operation of the laser; the interference module A fiber-optic Mach-Zehnder interferometer (MZI) or a fiber-optic Michelson interferometer structure can be used....

Embodiment 3

[0058] 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; Combined with the single-mode optical fiber 1 obliquely, 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 optical 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. The reflective surface of the reflector 5 faces the slotted opening of the slotted stainless steel tube 6, which can reduce the astigmatism of the light source passing through the cylindrical inner...

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Abstract

The invention provides a method or processing an OCT (Optical Coherence Tomography) signal in an OCT system by using a general purpose graphic processing unit (GPGPU). The method comprises the following four steps: (1) acquiring data; (2) transmitting the data; (3) processing the data; and (4) transmitting the data to a graphic display library. When the data are transmitted, OCT original data which are transmitted to an equipment memory at the last time by the general purpose graphic processing unit are subjected to parallel processing; and the processed data are stored into the memory of the graphic display library. By virtue of the method, FD-OCT digital signal processing efficiency can be improved, and real-time processing and displaying of a graphic can be realized; the requirements and cost of digital signal processing equipment are reduced, the transportability of software is improved and the software development cost is reduced; and meanwhile, the method is in seamless combination with a current modern graphic display library so that the flexibility of software display is improved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an image processing method applied to optical coherence tomography imaging, which provides a simple, efficient, highly portable, and compatible with popular image display libraries (such as OpenGL, DirectX) Processing methods and systems. Background technique [0002] Optical Coherence Tomography (OCT) has been widely used in the field of ophthalmology diagnosis. This technology is based on optics, electronics and computer technology science. A new imaging technology integrating many frontier disciplines, OCT has attracted people's attention due to its advantages such as 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 resolution. Compared with traditional laser confocal microscopes, OCT ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00A61B6/00
CPCA61B1/00A61B6/00A61M25/10G06T11/00
Inventor 奚杰峰李常青冷德嵘
Owner MICRO TECH (NANJING) CO LTD
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