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Processes of heating and destruction of the breast fat tissue under the action of
focused high-intensity ultrasound generated by a 128-element transducer are considered. The
simulation of a thermal problem is carried out by anumerical solution of the heat transfer
equation. The acoustic pressure field in the tissue is calculated using the Rayleigh integral. A
system of dimensionless scaling parameters is proposed to describe the non-stationary process
of heat propagation. The influenceof the space localization of foci in a series of pulses on the
lesion size is analyzed. The results demonstrate the advantages of a tissue processing program
withspatially divergingfocal points of pulses, consisting in a more uniform heating of the
tissue and the formation of a continuous ablation area. The impact of the perfusion process on
the lesion size is considered.
Keywords: high-intensity focused ultrasound, tumor ablation, heat transfer equation, heat propagation in tissue |
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