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11 June 2002 Interaction of focused ultrasound with biological materials
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This work is motivated by possible medical applications of focused ultrasound in minimally invasive treatment of a variety of disorders. The mechanical and thermal effects caused by high-frequency ultrasound in different material systems are calculated using a finite element based program called PZflex. The pressure distributions generated by plane as well as focused ultrasound beams are presented. For the focused beam, the temperature distribution in the focal zone is also calculated. The results indicate that the heating efficiency of the ultrasound energy in the focal region depends on the exciting frequency and the geometry of the focal zone depends on the material being tested. At higher excitation energies, cavitation and nonlinear effects need to be included in the simulations. These effects are under current investigation.
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Ajit K. Mal, Feng Feng, Michael Kabo, Jeffrey Wang, and Yoseph Bar-Cohen "Interaction of focused ultrasound with biological materials", Proc. SPIE 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems, (11 June 2002);

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