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Map-like atrophy projection image generation method based on sd-oct retinal images

A technology for projecting images and retinas, which is applied in image analysis, image data processing, instruments, etc., can solve the problems of low contrast of GA projection images and does not consider the influence of choroidal blood vessels, so as to improve the contrast and gray consistency, overcome effect of influence

Inactive Publication Date: 2016-09-21
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] Therefore, the existing GA projection image generation method does not consider the influence of choroidal blood vessels, resulting in low contrast of the generated GA projection image

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  • Map-like atrophy projection image generation method based on sd-oct retinal images
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  • Map-like atrophy projection image generation method based on sd-oct retinal images

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Embodiment Construction

[0032] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0033] Such as figure 1 As shown, according to a preferred embodiment of the present invention, a method for generating a map-like atrophy projection image based on an SD-OCT retinal image, its realization may include the following steps:

[0034] Step 1, collecting SD-OCT retinal images;

[0035] Step 2, segment the Bruch's membrane boundary (ie BM boundary) of the image obtained in step 1;

[0036] Step 3. In the 0.5 mm thick narrow band region below the boundary of Bruch's membrane, locate the pixels with decreasing gray value in each column from top to bottom;

[0037] Step 4, forming a curve with the gray value decreasing pixels obtained in step 3, and using the area between the curve and the abscissa as the value of the GA projection image to generate a projection image; and

[0038] Step ...

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Abstract

The present invention provides a method for generating a map-like atrophy projection image based on an SD-OCT retinal image, the realization of which comprises the following steps: Step 1, collecting an SD-OCT retinal image; Step 2, segmenting the Bruch's membrane boundary of the image obtained in Step 1 ; Step 3, in the 0.5 mm thick narrow band region below the boundary of Bruch's membrane, locate the pixels with decreasing gray values ​​in each column from top to bottom; Step 4, form the gray value decreasing pixels obtained in step 3 A curved surface, and use the area between the curved surface and the abscissa as the value of the GA projection image to generate a projection image; and step 5, use median filtering to smooth the GA projection image generated in the aforementioned step 4 to obtain the final result. The SD-OCT retinal image-based geographic atrophy projection image generation method of the present invention considers and overcomes the influence of choroidal blood vessels on the GA projection image, and improves the contrast and gray consistency of the GA projection image.

Description

technical field [0001] The present invention relates to the technical field of generation and processing of projection images, in particular to a method for generating projection images of geographic atrophy based on SD-OCT retinal images. Background technique [0002] SD-OCT (frequency-domain optical coherence tomography) retinal image is a frequency-domain optical coherence tomography image, which can effectively present changes in the grayscale and structure of retinal tissue layers. Clinical experiments have shown that SD-OCT images can be used for The extent of geographic atrophy (GA) was measured. Since the SD-OCT image is three-dimensional, it is not conducive for doctors to observe the range of GA intuitively and comprehensively. Therefore, it is necessary to project the three-dimensional SD-OCT image into a two-dimensional fundus image. The existing GA projection image generation methods are mainly based on the characteristic that the gray value of the choroid in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 陈强牛四杰沈宏烈陆圣陶王玉萍
Owner NANJING UNIV OF SCI & TECH
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