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Method for segmenting blood vessel in digital subtraction angiography (DSA) image sequence

An angiography and image sequence technology, applied in the field of medical imaging, can solve the problems of time-consuming, subjective judgment, and error-prone

Inactive Publication Date: 2012-02-08
北京集翔多维信息技术有限公司
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Problems solved by technology

However, most coronary artery extraction algorithms require a certain amount of human-computer interaction, which is not only time-consuming, but also subjective and error-prone

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  • Method for segmenting blood vessel in digital subtraction angiography (DSA) image sequence
  • Method for segmenting blood vessel in digital subtraction angiography (DSA) image sequence
  • Method for segmenting blood vessel in digital subtraction angiography (DSA) image sequence

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Embodiment Construction

[0023] 1) Background denoising

[0024] Due to the uneven exposure of X-rays, there are large bright spots on the contrast images, and these bright spots move with the image changes in the image sequence, and these bright spots have a great impact on the background separation algorithm. The purpose of background denoising is to remove bright spots on these contrast images. Here we use nonlinear filtering to remove bright spots. The main steps are as follows: First, calculate the average gray level of the entire image for each image in the contrast image sequence, which is recorded as In_average. Secondly, all the pixels are divided into two categories according to the average gray size, the pixels smaller than In_average are class 1, and the pixels larger than In_average are class 2. Calculate the average gray level of pixels in class 2, denoted as In_average2. For pixels whose grayscale exceeds In_average2, set their grayscale to In_average2. In this way, you get Figure...

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Abstract

The invention discloses a method for segmenting a blood vessel in a digital subtraction angiography (DSA) image sequence. The method comprises the following steps of: removing noise from a background, performing background separation on an angiography sequence image by a fuzzy C-mean clustering algorithm, and extracting the blood vessel of the angiography sequence image in the angiography image sequence by a background difference method. The method can be used for effectively segmenting the angiography sequence, and is simple in operation and high in segmenting efficiency.

Description

technical field [0001] The invention belongs to the technical field of medical imaging, and in particular relates to a method for segmenting blood vessels in a sequence of digital angiography images. technical background [0002] Digital Subtraction Angiography (Digital Subtraction Angiography, DSA) is a new X-ray imaging system, which is the product of the combination of conventional angiography and computer image processing technology. The basic principle of DSA imaging is to take the angiographic X-ray fluorescence images of the inspected part without injection of contrast agent and after injection of contrast agent, after being amplified by the image intensifier, and then scanned by a high-resolution TV camera tube, the image is divided into Many small squares are made into a matrix to form a video image composed of pixels in the small squares. After logarithmic amplification and analog-to-digital conversion, they are converted into numbers of different values ​​to form ...

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Application Information

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IPC IPC(8): G06T7/00
Inventor 易新戴政国随晓谛
Owner 北京集翔多维信息技术有限公司
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