Effects of vapour bubbles on acoustic and temperature distributions of therapeutic ultrasound

• 来源期刊: 中国物理B（英文版）
• 关键词: vapour bubbles ultrasound propagation temperature rise
• 年，卷（期）: 2008,（9）
• 页码范围: 3372-3377
• 页数: 6页
• 语种: 英文

摘要

This paper describes the evolution of vapour bubbles and its effect on nonlinear ultrnsound propagation and temperature rise through tissues for therapeutic ultrasound.An acoustic-thermo coupling algorithm incorporating nonlinearity,diffraction,and temperature-dependent tissue properties,is employed to describe nonlinear ultrasound propagation and thermal effect.Results demonstrate that an obvious migration of peak pressure toward transducer surface is observed while the position of peak temperature changes little in liver tissue before the generation of vapour bubbles,and that the boiling region enlarges towards the surface of transducer in axial direction but increases slowly in radial direction after the generation of vapour bubbles.