Boundary condition processing method and device for three-dimensional model of coronary artery

Abstract

The object of the present invention is to provide a processing method and device for boundary conditions of a three-dimensional coronary model. The simulation device initializes the three-dimensional coronary model of the current patient and the flow resistance model as the boundary condition of the three-dimensional coronary model; uses the initialization result of the flow resistance model as a boundary condition, and performs simulation calculation on the three-dimensional coronary model; and so on and back and forth until the result of the simulation calculation satisfies the convergence condition. The present invention provides a boundary condition processing method based on steady-state simulation and capable of effectively considering the influence of flow resistance. Compared with the existing complex flow resistance model, the calculation time is greatly shortened, for example, it can be reduced from several hours to 10 minutes Left and right, it also solves the problem that the existing flow model will produce obviously unreasonable results.

Description

technical field [0001] The invention relates to the technical field of medical image processing, in particular to a technology for processing boundary conditions for a three-dimensional coronary model. Background technique [0002] Fractional Flow Reserve (FFR) is a functional index to evaluate the degree of myocardial ischemia caused by coronary artery stenosis. The traditional method to obtain the FFR of patients with coronary heart disease is through invasive interventional measurement methods. With the development of computer technology and medical imaging technology, the combination of computed tomographic angiography (Computed Tomographic Angiography, CTA) images and computational fluid dynamics, FFR results can be obtained non-invasively by constructing vascular models and hydrodynamic simulations. [0003] In the prior art, there are mainly two types of boundary conditions used for non-invasive FFR calculation: one is to directly provide the flow of each branch of t...

AI Technical Summary

Problems solved by technology

The first method uses the flow model as the boundary condition, which has fast calculation speed, simple process, and easy control. The non-invasive FFR calculation based on this method is easy to deploy in clinical practice, but it is easy to cause negative pressure in the coronary artery due to excessively high estimated flow rate. wait for unreasonable circumstances

The second method using a complex flow resistance model as the boundary condition considers the simulation of the flow resistance at the distal end of the coronary artery, and there will be no unreasonable situations, but it requires complex transient coupling calculations, which takes a long time and is complicated. , is difficult to control, which leads to poor clinical trial performance. This complex flow resistance model structure is as follows figure 1 shown

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