Ultrafast Ultrasound Doppler Blood Flow Estimation Method Based on Multi-angle Plane Wave Recombination

Abstract

The invention discloses an ultrafast ultrasonic Doppler blood flow estimating method with repeated compounding of multi-angle plane waves. The method includes: controlling the ultrasonic transducer to cyclically emit plane waves whose deflection angles are {0, β, β, β}; receiving echo signals of plane waves reflected by the area to be scanned; searching for deflection angles in the echo signals Three frames of continuous signals in sequence {0, β, β} and deflection angles in sequence {β, β, 0} to obtain multiple frame groups; superimpose the three frames of continuous signals in each frame group to obtain Composite radio frequency signal; calculate the blood flow velocity according to the composite radio frequency signal; color-code the blood flow velocity to generate a two-dimensional blood flow velocity image. In coherent compounding, the last RF echo signal is repeatedly used for the next compounding. Compared with the traditional coherent compounding technique in which all RF echo signals are only compounded once, the pulse repetition frequency is increased by 50%, thereby improving ultra-fast Ultrasound Doppler technology maximum detectable range of blood flow velocity.

Description

technical field [0001] The invention relates to the technical field of ultrasonic imaging, in particular to an ultrafast ultrasonic Doppler blood flow estimation method for repeated compounding of multi-angle plane waves. Background technique [0002] The blood flow velocity distribution in the vascular system refers to the spatial distribution of the blood flow velocity on the radial section of the vascular lumen. During the blood flow process, due to the friction between the blood vessel wall and its own viscosity, it flows in layers in the radial direction, and the flow velocity of each layer is different. Gradually decreases. In healthy blood vessels, the blood flow velocity distribution is parabolic, but in diseased blood vessels with atherosclerosis, the blood flow velocity distribution is changed due to the influence of plaque, no longer parabolic, and even turbulent and eddy currents appear. Hemodynamics is based on the distribution of blood flow velocity, and hemo...

AI Technical Summary

Problems solved by technology

However, using multiple frames of images to generate a frame of composite images, the coherent composite plane wave algorithm leads to a decrease in the pulse repetition frequency while improving the signal-to-noise ratio, thereby reducing the detectable range of the maximum blood velocity of the ultra-fast ultrasound Doppler technique

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