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

Abstract

The invention discloses a method for calculating fractional flow reserve based on a pressure sensor and a contrast image. The method comprises the following steps: acquiring pressure of a heart coronary mouth in real time through a blood pressure sensor; storing a pressure numerical value to a data link list; storing the data link list by using time as an index in a form of time and real-time pressure key value pairs; acquiring the contrast time according to contrast images and searching corresponding data from a data queue according to the time index by using the contrast time as an index value, and screening out stable pressure waveform in multiple periods so as to acquire average pressure Pa; acquiring the length of a section of blood vessel from the contrast images of two body positions so as to acquire blood flow velocity; calculating pressure drop delta P at the section of the blood vessel at the inlet blood flow velocity V; calculating far-end pressure Pd of the blood vessel tofurther calculate the contrast fractional flow reserve. According to the method disclosed by the invention, the stable pressure value after injection of contrast agent can be accurately acquired; theaverage blood flow velocity of one cardiac cycle can be accurately acquired through the pressure waveform and the contrast images, so that the accuracy of FFR (Fractional Flow Reserve) can be greatlyimproved.

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.

Images