Method for calculating contrast blood flow reserve fraction and resting pressure ratio based on contrast images

A technique for fractional blood flow reserve and angiographic images, applied in image analysis, image data processing, calculation, etc., can solve the problems of expensive and large-scale application of pressure guide wires, increase the difficulty and risk of surgery, and reduce the difficulty and risk of surgery, Easy to use effect

Pending Publication Date: 2020-05-19
SUZHOU RAINMED MEDICAL TECH CO LTD
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Problems solved by technology

It needs to rely on the pressure guide wire for measurement. The pressure guide wire needs to intervene at the end of the blood vessel, which incr...

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  • Method for calculating contrast blood flow reserve fraction and resting pressure ratio based on contrast images
  • Method for calculating contrast blood flow reserve fraction and resting pressure ratio based on contrast images
  • Method for calculating contrast blood flow reserve fraction and resting pressure ratio based on contrast images

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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0064] Such as figure 1 As shown, the method for calculating the ratio of the contrast blood flow reserve fraction and the resting pressure based on the contrast images of the present invention includes the following steps.

[0065] Step S1: Measure the pressure P of the coronary port of the heart through the blood pressure sensor a , the specific method is as follows:

[0066] The pressure tube of the blood pressure s...

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Abstract

The invention discloses a method for calculating contrast blood flow reserve fraction based on contrast images. The method comprises the following steps: measuring pressure Pa of a coronary artery port of a heart through a blood pressure sensor; acquiring two-dimensional pipe diameter and length of a blood vessel through the contrast images, generating a three-dimensional blood vessel grid model through two contrast images with included angles of 30 degrees or more, and acquiring the three-dimensional pipe diameter and length of the blood vessel; measuring time taken by blood containing contrast agents moving from a starting point to an ending point of a specified blood vessel, and calculating blood flow velocity V<1> according to the time and the three-dimensional length of the blood vessel; and taking the blood flow velocity V<1> as a coronary artery inlet flow velocity to calculate pressure drop delta P<1> from a coronary artery inlet to a coronary artery stenosis distal end, calculating average pressure P<d1> in the coronary artery stenosis distal end through a formula of P<d1>=Pa-delta P<1>, and calculating the contrast blood flow reserve fraction through a formula of cFFR=P<d1>/Pa. Therefore, cFFR and resuming Pd/Pa can be obtained by conventional contrast images without use of vasodilators.

Description

technical field [0001] The present invention relates to the field of coronary imaging evaluation, in particular to a method for calculating contrast fractional flow reserve (cFFR) and resting pressure ratio (resting Pd / Pa) based on contrast images. Background technique [0002] Fractional flow reserve (FFR) can indicate the influence of coronary artery stenosis on distal blood flow, and it has become a recognized index for functional evaluation of coronary artery stenosis in diagnosing myocardial ischemia. FFR is defined as the ratio of the maximum blood flow supplied to the myocardium by a narrowed coronary artery to the maximum blood flow supplied to the myocardium by the same coronary artery when it is normal. It can be simplified as the ratio of the mean pressure (Pd) in the coronary artery at the distal end of the stenosis to the mean pressure (Pa) in the aorta at the coronary ostium under the state of maximum myocardial hyperemia, that is, FFR=Pd / Pa. [0003] When det...

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Application Information

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IPC IPC(8): A61B5/026A61B5/021A61B5/02G06T17/20
CPCA61B5/026A61B5/021A61B5/02007G06T17/20A61B5/02G06T7/00Y02T90/00
Inventor 霍云飞刘广志吴星云
Owner SUZHOU RAINMED MEDICAL TECH CO LTD
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