Method for measuring blood flow velocity of blood vessel

Abstract

The invention discloses a method for measuring the blood flow velocity of a blood vessel. The method comprises the following steps: injecting a quantitative amount of a contrast agent to the originalpoint of blood flow in a target region; scanning the original point of blood flow in the target region with CT to obtain the image of the original point, and starting timing; performing perfusion scanning on the terminal end of the blood flow in the target area with CT to obtain the image of the contrast agent firstly reaching the terminal point, and recording the time t; spirally scanning the target area to realize three-dimensional reconstruction of the blood vessel in the target area; straightening the blood vessel in the target area and measuring the blood vessel length S of the target area by analysis and measurement software for the CT; and calculating the blood flow velocity V of the target area according to the blood vessel length S of the target area and the time t, that is V = S / t. The method for measuring the blood flow velocity of the target area based on a spiral CT imaging system can be used to intuitively and conveniently display data required for calculating the blood flow velocity of the blood vessel, so the accuracy of data is effectively ensured, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the application in the medical field, in particular to a method for measuring blood flow velocity in blood vessels. Background technique [0002] Blood velocity refers to the speed at which blood cells and fluid flow in blood vessels. The blood is viscous, the flow rate slows down, and the lipids in the blood are deposited on the inner wall of the blood vessel, resulting in narrow lumen and insufficient blood supply. For example, coronary artery stenosis leads to myocardial ischemia or myocardial infarction, which is life-threatening; cerebral artery stenosis leads to cerebral infarction and paralysis of the limbs dominated by the infarcted area; limb artery stenosis leads to weakened limb function or muscle necrosis at the end of the stenosis. When the human body is in a state of exercise, rest or disease, the velocity of its arterial blood flow is different. By measuring the arterial blood flow velocity, understanding its c...

AI Technical Summary

Problems solved by technology

When continuous ultrasonic Doppler measures blood flow velocity, the result is greatly affected by the angle between the sound beam and the direction of motion, and it is impossible to understand the location of abnormal blood flow; when pulsed ultrasonic Doppler measures blood flow velocity, the blood flow velocity measured by it The size of the Doppler frequency shift is limited by the pulse repetition frequency. When the frequency shift value exceeds the Nyquist frequency, the peak part of the blood flow with high velocity cannot be displayed normally, and the image of frequency inversion appears, and the measurement is accurate. degree cannot be guaranteed

In addition, due to the small range of sampling volume, it is necessary to move repeatedly on the cross-section, and the detection time is long

Therefore, the use of ultrasonic Doppler method to measure blood flow velocity is limited by probe angle, sampling volume, etc.

, the scope of application is small, the test efficiency is low, and the test data is inaccurate