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3D cortical surface segmentation method and system for octa images

A three-dimensional cortex and surface segmentation technology, which is applied in image analysis, image enhancement, image data processing, etc., can solve problems such as inability to use three-dimensional cortex boundary segmentation and cortical boundary segmentation, and achieve the effect of high segmentation accuracy

Active Publication Date: 2022-07-12
HANGZHOU DIANZI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

OCTA technology is mainly to generate three-dimensional images, and under the existing conditions, except for manual culling, the boundary segmentation method that can be used is still used for two-dimensional cross-sectional images, and cannot be used to complete three-dimensional cortical boundary segmentation
Furthermore, after vascular occlusion, the phenomenon of expansion and collapse will appear successively, which will be reflected in the image, and the conventional method will not be able to effectively segment the cortical boundary in the area of ​​​​the lesion.

Method used

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  • 3D cortical surface segmentation method and system for octa images

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Embodiment 1

[0067] like figure 1 As shown, the three-dimensional cortical surface segmentation method of the OCTA image in this embodiment includes the following steps:

[0068] S1. Perform bilateral filtering on the three-dimensional OCTA image to obtain a filtered image;

[0069] Specifically, the three-dimensional OCTA image is filtered by a bilateral filter, the luminance difference parameter is selected as 5, and the spatial distance parameter is selected as 75 to highlight the boundary information in the image.

[0070] S2, remove the cover glass in the filtered image to obtain a three-dimensional image of the target;

[0071] Specifically, the above step S2 includes the following steps:

[0072] S21, using the maximum inter-class variance method to convert the filtered image into a mask represented by 0 and 1;

[0073] S22, using the opening operation, the closing operation and the etching operation in sequence to process the mask to obtain a target mask;

[0074] S23, select s...

Embodiment 2

[0185] The difference between the three-dimensional cortical surface segmentation method of the OCTA image in this embodiment and Embodiment 1 is:

[0186] In smoothing the sparse cortical surface, only median filter is used for smoothing, and there is no need to calculate the second derivative to meet the needs of different applications;

[0187] For other steps, refer to Example 1;

[0188] Correspondingly, the smoothing module of the three-dimensional cortical surface segmentation system of the OCTA image in this embodiment only needs to use median filtering for smoothing;

[0189] For other architectures, refer to Embodiment 1.

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Abstract

The invention relates to a three-dimensional cortical surface segmentation method and system of an OCTA image, comprising: bilateral filtering of the OCTA image to obtain a filtered image; removing a cover glass in the filtered image to obtain a target three-dimensional image; The section is used as the starting plane, and the boundary of the cortex is divided to obtain the boundary dividing line of the starting plane; with the starting plane as the benchmark, 3D image data blocks with preset thickness are selected in turn from the front and rear sides until the entire target 3D image is divided; Starting with a 3D image data block close to the starting plane, combined with the boundary dividing line of the starting plane, calculate the cortical boundaries of each 3D image data block from the inside to the outside and form a sparse cortical surface; smooth the sparse cortical surface to get Sparse target cortical surface; expand the sparse target cortical surface to obtain a dense 3D cortical surface. The invention does not need to manually segment the surface of the cortex, and the segmentation accuracy of the surface of the three-dimensional cortex is high.

Description

technical field [0001] The invention belongs to the technical field of medical image processing, and in particular relates to a three-dimensional cortical surface segmentation method and system of OCTA images. Background technique [0002] OCT (optical coherence tomography) imaging technology mainly uses interferometry to detect the coherent light signal backscattered by the sample, and then obtains the information in the depth direction of the sample through post-processing and performs structural imaging. It has non-invasive, no radiation damage, high sensitivity and high resolution. rate and other advantages. After more than 20 years of innovation and development, OCT imaging technology is becoming more and more mature, and there are corresponding specific improvements for different application scenarios. Among them, OCT-basedangiography (OCTA) is a functional extension of OCT technology, which can perform high-resolution visualization imaging of microvascular network st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/13G06T5/00G06T5/30
Inventor 刘珂舟蔡正厅印梦婕付广玉魏劭农严明
Owner HANGZHOU DIANZI UNIV