Method for ultrafast ultrasonic Doppler blood flow estimation by multi-angle plane wave repeated combination

Abstract

The invention discloses a method for ultrafast ultrasonic Doppler blood flow estimation by multi-angle plane wave repeated combination. The method comprises the following steps: controlling an ultrasonic transducer to circularly emit plane waves with deflection angles being {0, -beta, beta, -beta} in sequence; receiving echo signals of plane waves reflected by a to-be-scanned area; searching threeframes of continuous signals of which the deflection angles are sequentially {0, -beta, beta} and the deflection angles are sequentially {beta, -beta, 0} in the echo signals so as to obtain a plurality of frame groups; superposing three frames of continuous signals in each frame group so as to obtain a combined radio frequency signal; calculating a blood flow velocity according to the combined radio frequency signal; and performing color coding on the blood flow velocity so as to generate a two-dimensional blood flow velocity image. In coherent combination, the last radio frequency echo signal is repeatedly used for next combination; and compared with a traditional coherent combination technology in which all radio frequency echo signals are only combined once, the method provided by theinvention improves the pulse repetition frequency by 50%, so the maximum blood flow velocity detectable range of the ultrafast ultrasonic Doppler technology is improved.

Description

Technical field [0001] The invention relates to the technical field of ultrasound imaging, in particular to an ultrafast ultrasound Doppler blood flow estimation method of multi-angle plane wave repetitive compounding. Background technique [0002] The blood flow velocity distribution in the vascular system refers to the spatial distribution of blood flow velocity on the radial section of the vascular cavity. 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. The flow velocity of each layer is different. The velocity of the central layer of the lumen is the largest, and it tends to the position of the blood vessel wall. Gradually decreases. In a healthy blood vessel, the blood flow velocity distribution is parabolic, while in a diseased blood vessel with atherosclerosis, the blood flow velocity distribution changes due to the influence of plaque, and no longer assumes a parabolic sha...

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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 repetitio

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