Ultrasound Doppler signal simulation based on wavefront propagation

Abstract

Ultrasound Doppler blood flow measurement is to measure the velocity of blood flow through the frequency shift characteristics of Doppler signal. It has the advantages of high sensitivity, non-invasive, strong direction and simple operation. The simulation of ultrasonic Doppler signal is an important aspect in the research field of ultrasonic Doppler signal. Computer simulation of Doppler signal can be used to evaluate the accuracy of Doppler velocity measurement method in early stage. It is an effective way to improve the accuracy of Doppler velocity measurement. Generally speaking, the theoretical model of the existing simulation method is relatively complex and the calculation amount is large. In this paper, a relatively simple simulation algorithm is proposed to simulate the Doppler echo signal in time and space domain. This method is based on the physical concept of wave front propagation. According to the time of moving object passing through two adjacent wave front with the same phase, the relationship between Doppler signal data and primary ultrasonic signal data is determined. The Doppler signal data is established by extracting the data of the primary transmitted ultrasound signal. A simple, efficient and intuitive simulation algorithm of Doppler echo signal is realized. The experimental results show that the simulation results are consistent with the theoretical calculation. It can more intuitively simulate the characteristics of real Doppler signals, accurately simulate continuous wave Doppler signals and pulse wave Doppler signals, and provide an effective and reliable signal source for Doppler signal analysis and processing methods.