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 poor deformation matching, complex calculation, and low precision
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[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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