Method for calculating fractional blood flow reserve based on pressure sensor and contrast images

Abstract

The invention discloses a method for calculating the blood flow reserve fraction based on a pressure sensor and contrast images, comprising: collecting the pressure of the heart coronary artery in real time through a blood pressure sensor, storing the pressure value in a data linked list, and the data linked list takes time as an index, and uses The time and real-time pressure values ​​are saved in the form of key-value pairs; the contrast time is obtained according to the contrast image, and the contrast time is used as the index value to find the corresponding data from the data queue according to the time index, and the stable pressure waveform of multiple cycles is screened out to obtain the average pressure Pa; obtain the length of a section of blood vessel from the contrast images of two body positions, and obtain the blood flow velocity V; calculate the pressure drop ΔP at the entrance blood flow velocity V in this section of blood vessel, calculate the distal pressure Pd of the vessel, and further calculate the contrast blood flow reserve score. The stable pressure value after creating the contrast agent can be accurately obtained, and the average blood flow velocity of a cardiac cycle can be accurately obtained through the pressure waveform and contrast images, which can greatly improve the accuracy of FFR.

Description

technical field [0001] The invention relates to the field of coronary imaging evaluation, in particular to a method for calculating a blood flow reserve fraction based on a pressure sensor and contrast images. Background technique [0002] Fractional flow reserve (FFR) can indicate the impact of coronary stenosis on distal blood flow, and diagnose whether myocardial ischemia has become a recognized index for functional evaluation of coronary stenosis. Several studies have demonstrated the feasibility of measuring FFR with contrast images and computational fluid dynamics. [0003] The patent document with the application number 201610681191.1 discloses a method for calculating coronary artery blood flow reserve fraction based on X-ray coronary angiography images. The blood flow velocity is obtained by flow, the pressure difference ΔP of the vascular model is calculated by computational fluid dynamics, the coronary inlet pressure Pa is obtained, the distal blood vessel pressu...

AI Technical Summary

Problems solved by technology

The previous method of blood flow velocity measurement based on the frame counting method and the general way of obtaining the inlet pressure Pa will cause errors in parameter acquisition, so that the accuracy of the calculated FFR is not high.

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