Method and system for lumen modeling and vascular pressure difference calculation based on main branch vessel and side branch vessel parameters

Abstract

The invention provides a method and system for lumen modeling and vascular pressure difference calculation based on main branch vessel and side branch vessel parameters. The system includes a parameter acquisition module, a lumen model establishment module, a vascular pressure difference calculation module and a result display module. The parameter acquisition module is used for acquiring image data of a vascular lumen and the maximum mean blood flow velocity that a vascular segment can pass. The lumen model establishment module is used for establishing a vascular lumen geometric model and anideal vascular lumen geometric model. The vascular pressure difference calculation module performs a quick calculation of a vascular pressure difference. The result display module is used for displaying results. According to the invention, a precise ideal vascular lumen geometric model is established using the main branch vessel and the side branch vessel, combined with multi-scale and vascular eccentricity parameters, the rapid calculation of the vascular pressure difference is achieved, and the calculation accuracy can be effectively improved while the calculation speed is ensured.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a method and system for rapidly and accurately calculating blood vessel pressure differences based on image data. Background technique [0002] Narrowing of blood vessels affects the normal supply of blood. Using imaging methods such as angiography, although the severity of stenosis can be displayed, the functional changes of blood vessels cannot be known. Vascular pressure difference refers to the pressure difference between the proximal start point and the distal end point of the vessel segment of interest, and is a parameter that can effectively reflect the blood supply function of the blood vessel. [0003] However, the measurement of vascular pressure difference is very difficult. Invasive and invasive pressure measurement of blood vessels through pressure sensors is not only a lot of work, but also has the risk of damaging blood vessels. Obtain the geometric model of the v...

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Problems solved by technology

[0011] Although the above-mentioned patent documents and academic documents provide methods for determining blood vessel pressure difference from different angles and different calculation methods, they still have at least one or more of the following technical defects: (1) Patent Document 1 and Patent Document 2 mention The methods mentioned above all use the pressure guide wire to intervene in the blood vessel to collect the relevant geometric parameters of the blood vessel, which is not only costly, but also causes physical damage to the patient; (2) the method mentioned in Patent Document 3, although it can realize the Non-invasive and fast calculation of pressure difference, but in the calculation process, the influence of stenosis eccentricity on blood vessel pressure difference is not taken into account. There will be errors in the vascular pressure difference; (3) Although Patent Document 4 introduces the eccentricity parameter, which can improve the calculation accuracy to a certain extent, a relatively simple method is still used for the reconstruction of the ideal vascular lumen, and the obtained The reconstruction results are not very accurate, which will lead to deviations between the calculation results of the vascular pressure difference and the real situation; (4) Document 5 ignores side-branch vessels for simplified calculations. For the case of multi-branch vessels, the method described in this document does not Accurate results cannot be obtained; (5) Document 6 is only applicable when there is a single stenosis in the blood vessel, and does not take into account the influence of the curvature of the blood vessel on the pressure difference, and there are errors in the calculation results

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