Map-like atrophy projected image generation method based on SD-OCT retina images

A technology for projecting images and retinas, applied in image analysis, image data processing, instruments, etc., can solve the problems of not considering the influence of choroidal blood vessels, low contrast of GA projection images, etc., to improve the contrast and grayscale consistency, overcome the influence Effect

Inactive Publication Date: 2014-09-17
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 infl

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  • Map-like atrophy projected image generation method based on SD-OCT retina images
  • Map-like atrophy projected image generation method based on SD-OCT retina images
  • Map-like atrophy projected image generation method based on SD-OCT retina images

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[0032] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[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 SD-OCT retinal image, its implementation includes the following steps:

[0034] Step 1. Collect SD-OCT retinal images;

[0035] Step 2. Segment the Bruch film boundary (ie BM boundary) of the image obtained in Step 1;

[0036] Step 3. In the 0.5 mm thick narrow band area below the boundary of the Bruch film, locate each column of pixels with decreasing gray values ​​from top to bottom;

[0037] Step 4. Construct a curved surface from the gray value decreasing pixels obtained in Step 3, 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

[0038] Step 5. Use median filter...

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Abstract

The invention provides a map-like atrophy projected image generation method based on SD-OCT retina images. The method comprises the realizing steps that 1, the SD-OCT retina images are collected; 2, Bruch's membrane boundaries of the images obtained in the step 1 are divided; 3, each column of pixel points with gray values decreased progressively from top to bottom are located in the narrow-band area which is 0.5 millimeter thick and is located below the Bruch's membrane boundaries; 4, the pixel points, with the gray values decreased progressively, obtained in the step 3 form a curved surface, and the area between the curved surface and horizontal coordinates is used as a value of a GA projected image to generate a projected image; 5, the GA projected image generated in the step 4 is smoothed through median filtering to obtain the final result. According to the map-like atrophy projected image generation method based on the SD-OCT retina images, the influence on the GA projected image from the choroid membrane layer blood vessel is considered and overcome, and the contrast and gray scale uniformity of the GA projected image can be improved.

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...

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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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