Method for calculating instantaneous waveform-free ratio based on pressure sensor and contrast image

Abstract

The invention discloses a method for calculating an instantaneous waveform-free ratio based on a pressure sensor and a contrast image, which comprises the following steps of: acquiring pressure of a coronary artery port of a heart in real time through a blood pressure sensor, and storing a pressure numerical value into a data link table, wherein the data link table is stored in the form time and real-time pressure key value pairs by using time as an index; finding corresponding data from a data queue according to the time index by using the contrast time as an index value, and using an averagevalue of four waveform-free pressure values as a waveform-free pressure value Pa; acquiring a time Tn of the end of a diastolic period, namely a waveform-free period, a blood flow velocity V is obtained by obtaining the length L of a section of blood vessel from the imaging images of two positions, pressure drop delta P is calculated, the far-end vessel pressure Pd=Pa-delta P, and the instantaneous waveform-free ratio is further obtained. The pressure value can be accurately obtained, the blood flow velocity of one cardiac cycle can be accurately obtained, and the accuracy of the FFR is greatly improved.

Description

technical field [0001] The invention relates to the field of coronary imaging evaluation, in particular to a method for calculating the instantaneous non-waveform ratio based on pressure sensors and contrast images. Background technique [0002] The instantaneous waveform-free ratio (iFR) provides a measure of intracoronary pressure similar to the fractional flow reserve (FFR). iFR does not require vasodilators, is simple to operate, and will be more widely used in coronary interventional therapy. The ADVISE study found that during a certain period of diastole (called the wave-free period), the intracoronary microvascular resistance is relatively the most stable and the lowest, and during the period of coronary congestion caused by vasodilators such as adenosine The average resistance achieved was similar. Such as figure 1 Shown, namely iFR=P dWave-free period / P aWave-free period (P dWave-free period : mean coronary pressure distal to the stenotic lesion during the no...

AI Technical Summary

Problems solved by technology

It needs to rely on the pressure guide wire for measurement, and the pressure guide wire needs to intervene at the end of the blood vessel, which is not only difficult, but also causes errors in the process of collecting pressure, which makes the accuracy of the calculated iFR not high

Images