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- Xinmai Yang
- National Center for Physical Acoustics, University of Mississippi, 1 Coliseum Drive, University, Mississippi 38677
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- Ronald A. Roy
- Department of Aerospace and Mechanical Engineering, Boston University, Boston, Massachusetts 02215
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- R. Glynn Holt
- Department of Aerospace and Mechanical Engineering, Boston University, Boston, Massachusetts 02215
説明
<jats:p>The deposition of ultrasonic energy in tissue can cause tissue damage due to local heating. For pressures above a critical threshold, cavitation will occur, inducing a much larger thermal energy deposition in a local region. The present work develops a nonlinear bubble dynamics model to numerically investigate bubble oscillations and bubble-enhanced heating during focused ultrasound (HIFU) insonation. The model is applied to calculate two threshold-dependent phenomena occurring for nonlinearly oscillating bubbles: Shape instability and growth by rectified diffusion. These instabilities in turn are shown to place physical boundaries on the time-dependent bubble size distribution, and thus the thermal energy deposition.</jats:p>
収録刊行物
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- The Journal of the Acoustical Society of America
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The Journal of the Acoustical Society of America 116 (6), 3423-3431, 2004-12-01
Acoustical Society of America (ASA)