Modeling the interference between shear and longitudinal waves under high intensity focused ultrasound propagation in bone

Abstract

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Establishing density-dependent longitudinal sound speed in the vertebral lamina

“…The total root mean square pressure error of the ray acoustics simulation was lower than reported in Xu and O'Reilly, 8 and the zero-lag cross correlation of the ray acoustics simulation was higher than reported in Xu and O'Reilly, confirming that the experimental data and vertebra registrations were accurate. The interference between longitudinal and shear modes has previously been investigated by Modena et al in skulls, 52 and the shear and longitudinal waves may interfere in a similar manner to the "fast" and "slow" waves that have previously been investigated 53,54 and that have been reported to generate negative dispersion in bone when the interfered signals are analyzed as a single signal. The waveforms acquired in this work were analyzed as single waveforms without interference between slow and fast waves or shear and longitudinal waves, as the signals in the maximum pressure region [Fig.…”

Synthetic CT for the planning of MR-HIFU treatment of bone metastases in pelvic and femoral bones: a feasibility study

“…Here, sCT might have additional value for characterization and/or delineation of the metastasis. Moreover, sCT images could potentially be used for identification of other bony structures along the US beam path and serve as input for sonication simulations to facilitate treatment cell positioning and optimization of sonication protocols for energy deposition in the target lesion [ 33 , 34 ]. This approach of combined sCT and MR images could also be of value for other fields of MR-HIFU applications in bones, such as treatment of osteoid osteoma.…”

Multi-frequency therapeutic ultrasound: A review

“…Spatial superimposition of acoustic waves of two or more frequencies may form destructive and constructive interference patterns that can change the amplitudes, phases and frequencies of the involved waves, and turn them into ones with a wider range of frequencies and pressure amplitudes [43] . Such waves can increase the chance of more efficient energy dissipation during cavitation and therefore are able to enhance the cavitation [2] .…”