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nonlinear-wave-propagation
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Numerical and experimental evaluation of high-intensity focused ultrasound-induced lesions in liver tissue ex vivo
, Article Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine ; Volume 37, Issue 6 , 2018 , Pages 1481-1491 ; 15509613 (ISSN) ; Ahmadian, M. T ; Sharif University of Technology
2018
Abstract
OBJECTIVES: Recent advances in the field of acoustics and piezoelectric and ultrasound transducers have led to new approaches to the diagnosis and treatment of certain diseases. One method of treatment with ultrasonic waves is high-intensity focused ultrasound (HIFU) treatment, which is a thermal therapeutic method used to treat malignant tumors. Although a variety of treatment-planning strategies using ultrasonic waves have been investigated, little clinical success has been achieved. Computational modeling is a powerful tool for predicting device performance. METHODS: The heating induced by a concave transducer with operating powers of 85 and 135 W was studied, and the experimental results...
Analysis of nonlinear acoustic wave propagation in HIFU treatment using westervelt equation
, Article Scientia Iranica ; Volume 25, Issue 4 , 2018 , Pages 2087-2097 ; 10263098 (ISSN) ; Ahmadian, M. T ; Sharif University of Technology
Sharif University of Technology
2018
Abstract
Currently, the HIFU (High-Intensity Focused Ultrasound) therapy method is known as one of the most advanced surgical techniques of tumor ablation therapy. Simulation of the non-linear acoustic wave and tissue interaction is essential in HIFU planning to improve the usefulness and efficiency of treatment. In this paper, linear, thermoviscous, and nonlinear equations are applied using two different media: liver and water. Transducer power of 8.3-134 Watts with the frequency of 1.1 MHz is considered as the range of study to analyze the interaction of wave and tissue. Results indicate that the maximum focal pressure of about 0.5-4.3 MPa can be achieved for transducer power rates of 8.3 to 134 W....