Cardiac wall stress-strain measuring method based on four-dimensional medical image

A stress-strain, measurement method technology, applied in medical science, diagnostic recording/measurement, application, etc., can solve problems such as complex calculation, low precision, and poor deformation matching.

Active Publication Date: 2010-12-29
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0006] In order to overcome the deficiencies of poor deformation matching, low precision, and complicated calculation of the existing heart wall stress and strain measurement methods, the present invention provides a heart wall based on four-dimensional medical images with good deformation matching, high precision, and greatly reduced computational complexity. Stress-strain measurement method

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  • Cardiac wall stress-strain measuring method based on four-dimensional medical image
  • Cardiac wall stress-strain measuring method based on four-dimensional medical image
  • Cardiac wall stress-strain measuring method based on four-dimensional medical image

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings.

[0050] refer to Figure 1 to Figure 10 , a method for measuring heart wall stress and strain based on a four-dimensional medical image, the method for measuring heart wall stress and strain comprises the following steps:

[0051] 1), establish a B-spline surface model P(u, v) for the heart to be detected, where u, v are the normalized parameters when the B-spline surface is defined, and the parameter domains are all [0, 1]; n marker points a with known displacement i (i=1, 2, ... n), a i The spatial position in the spherical coordinate system is [θ i ψ i R i ], the normalized coordinates on P(u, v) are [u i , v i ], and a i The displacement of [rθ i rψ i R i ], establish the continuous displacement field of rθ, rψ and rR of the whole model through the displacement vectors of discrete n points;

[0052] 2), use the standardized coordinates u, v to fit th...

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Abstract

The invention provides a cardiac wall stress-strain measuring method based on a four-dimensional medical image, comprising the following steps: 1) establishing a B-spline surface model P(u,v) for the heart to be detected, wherein, n numbered known displacement mark points ai(i=1, 2, ..., n) exist on the model, corresponding normalized coordinates of ai is [ui, vi] and displacement of ai is [rthetai rpsii rRi]; and establishing a continuous displacement field by n numbered discrete displacement; 2) establishing connection for the positions of points and moving points in the displacement field, and fitting three displacement respectively; and 3) obtaining the position and the corresponding displacement of d0 under global coordinates according to the displacement vector of an arbitrary point on the cardiac wall in step 2), then rotating the position and the displacement to local coordinates using a rotation matrix T, that is, formula (9), and finally calculating strain and stress by formula (8) and formula (6) respectively. The cardiac wall stress-strain measuring method has good deformation matching performance, high precision and greatly reduced computational complexity.

Description

technical field [0001] The invention relates to a method for measuring heart wall stress and strain in the fields of image processing, computer vision, medical image analysis, cardiovascular medicine, mechanical dynamics and kinematics. Background technique [0002] The heart is the power center of human blood, so the analysis and research of heart function has also attracted much attention, and the left ventricle provides the main kinetic energy during the whole cardiac process. Therefore, the analysis and research of heart function can be transformed into the analysis and research of left ventricle. There are many functional parameters of the left ventricle, such as global parameters: left ventricular volume (LVV), ejection fraction (EF), ventricular wall thickness (WT), etc. These parameters can reflect the function of the entire ventricle to a certain extent, However, it is impossible to locate the specific lesion site. Therefore, in recent years, the academic circle has...

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Application Information

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IPC IPC(8): A61B5/11
Inventor 管秋杜雅慧陈胜勇刘盛蒋超王芳王万良
Owner ZHEJIANG UNIV OF TECH
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