Echocardiography signal modeling considering doppler effect

Abstract

A new model for the simulation of Blood Flow signal is introduced. Doppler ultrasound scanning is an important technique that non-invasively evaluates blood flow. A method for Doppler simulation that previously proposed by Jensen in the simulation program Field II in which he introduced a set of programs for simulating ultrasound transducer field uses time difference between consecutive snap shots to detect Doppler frequency shift. The Doppler effect is not taken into account. In this work a new model for calculation echo ultrasound signals from moving scatterer is introduced. In this method acoustic field and Doppler effect are taken into acount. A single element circular concave transducer for send and receive is used. The impulse response of transducer calculated using Ring function method. The transducer is derived with windowed sinusoidal signals. The scattered ultrasound signals from moving scatterer received and Doppler frequency shift is detected using DFT transform. The results show that the Calculated velocities are in good agreement with the initial velocities. © 2008 Springer-Verlag.