Orthogonal frequency ultrasound vibration pulses for SDUV

Orthogonal frequency ultrasound vibration (OFUV) pulses are developed to generate ultrasound radiation force for stimulating vibrations in a tissue region with preferred spectral distribution. So we can increase specific vibration harmonics in which the tissue mechanical response is concentrated. In order to achieve a better detection result, spectrum of vibration pulses, mechanical response and bandwidth of the transducer, distribution of the radiation force and tissues´ mechanical response have to be totally taken into consideration. It remains to be explored how these factors affect the distribution of shear waves spectrum together. Some computer simulations, in this work, have been done to detect the tissue harmonic motion induced by the OFUV pulses using pulse-echo ultrasound and Kalman filter.