Elastic analysis method of vascular wall based on finite element deformation theory

Abstract

A method for analyzing the elasticity of vessel walls based on finite element deformation theory belongs to the medical image analysis field. The elasticity of the vessel wall is analyzed by calculating strain characteristic values of the vessel wall in an IVUS image under pressure. An ultrasound transducer hovers in a certain position of a blood vessel lumen for acquiring images of a plurality of cardiac cycles; and the images are input into a computer for processing. The method comprises that: a template matching method is used for searching out matching points of marking points in an original image in a template image; the vessel wall is divided into a plurality of layers according to the organization characters of the vessel wall; a method for calculating the elasticity of the vessel walls based on finite element partition is provided; the vessel walls are divided into a plurality of conjoined triangles according to the characteristics of triangle infinite element strain; with a view to the interaction of the triangles in deformation, factors of influence are also added into the calculation of the strain value. The limitations existing in the existing method for analyzing the elasticity of the vessel walls are changed. The characteristics of pathological changes of the vessel walls are exactly portrayed, thus creating conditions for the analyzing of pathological changes.

Description

technical field [0001] The present invention relates to the field of computerized medical image analysis, in particular to a method for analyzing the elasticity of blood vessel walls based on finite element deformation theory. By processing and analyzing the blood vessel wall in an intravascular ultrasound (IVUS) image, the relative elasticity of the blood vessel wall can be determined. For the analysis and early prediction of vascular wall lesions. Background technique [0002] Intravascular Ultrasound (IVUS) imaging is a new diagnostic method that has been clinically used in the diagnosis of vascular lesions in recent years. Pathological components, such as calcification, fibrous tissue, lipid core and plaque rupture, ex vivo, etc. figure 1 . It is easier to detect early vascular lesions than coronary angiography, which can only provide long-axis images of arteries. At present, IVUS is being more and more widely used to evaluate the characteristics and degree of coronar...

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Problems solved by technology

Independent pixels have only grayscale features, and it is difficult to define search conditions when searching for matching points on the template image

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