The discrete scatterer model is improved to take into account the random distribution of the size and the acoustic impedance of scatterers. The backscattering coefficient and its dependence on the frequency are calcul...The discrete scatterer model is improved to take into account the random distribution of the size and the acoustic impedance of scatterers. The backscattering coefficient and its dependence on the frequency are calculated and analyzed. An experiment with a liver mimic phantom is conducted to verify the theoretical model.展开更多
In this study, ultrasonic backscattering signals in cancellous bones were obtained by finite difference time domain （FDTD） simulations, and the effect of trabecular material properties on these signals was analyzed....In this study, ultrasonic backscattering signals in cancellous bones were obtained by finite difference time domain （FDTD） simulations, and the effect of trabecular material properties on these signals was analyzed. The backscatter coefficient （BSC） and integrated backscatter coefficient （IBC） were numerically investigated for varying trabecular bone material properties, including density, Lame coefficients, viscosities, and resistance coefficients. The results show that the BSC is a complex function of trabecular bone density, and the IBC increases as density increases. The BSC and IBC increase with the first and second Lame coefficients. While not very sensitive to the second viscosity of the trabeculae, the BSC and IBC decrease as the first viscosity and resistance coefficients increase. The results demonstrate that, in addition to bone mineral density （BMD） and microarchitecture, trabecular material properties significantly influence ultrasonic backseattering signals in cancellous bones. This research furthers the understanding of ultrasonic backscattering in cancellous bones and the characterization of cancellous bone status.展开更多
文摘The discrete scatterer model is improved to take into account the random distribution of the size and the acoustic impedance of scatterers. The backscattering coefficient and its dependence on the frequency are calculated and analyzed. An experiment with a liver mimic phantom is conducted to verify the theoretical model.
基金supported by the National Natural Science Foundation of China(11174060,11327405)the Ph.D.Programs Foundation of the Ministry of Education of China(20110071130004,20130071110020)+1 种基金the Science and Technology Support Program of Shanghai(13441901900)the Program for New Century Excellent Talents in University(NCET-10-0349)
文摘In this study, ultrasonic backscattering signals in cancellous bones were obtained by finite difference time domain （FDTD） simulations, and the effect of trabecular material properties on these signals was analyzed. The backscatter coefficient （BSC） and integrated backscatter coefficient （IBC） were numerically investigated for varying trabecular bone material properties, including density, Lame coefficients, viscosities, and resistance coefficients. The results show that the BSC is a complex function of trabecular bone density, and the IBC increases as density increases. The BSC and IBC increase with the first and second Lame coefficients. While not very sensitive to the second viscosity of the trabeculae, the BSC and IBC decrease as the first viscosity and resistance coefficients increase. The results demonstrate that, in addition to bone mineral density （BMD） and microarchitecture, trabecular material properties significantly influence ultrasonic backseattering signals in cancellous bones. This research furthers the understanding of ultrasonic backscattering in cancellous bones and the characterization of cancellous bone status.
