High-intensity focused ultrasound (HIFU) has become an attractive therapeutic tool for noninvasive tumor treatment. The key component of HIFU systems is the acoustic transducer, which generates a focal region of high-intensity focused ultrasonic energy. A key determinant of safety in HIFU treatment is the size of the focal region. To achieve subwavelength focusing, we previously investigated the feasibility of an ultrasonic spherical cavity resonator (USCR) with two open ends. To further investigate the properties of the USCR, experiments and simulations were performed to comprehensively characterize the acoustic field generated. The emphasis was on the field formation process, the pressure distribution, the frequency dependence, and the acoustic nonlinearity. As a novel simulation approach, an axisymmetric isothermal multi-relaxation-time lattice Boltzmann method (MRT-LBM) model was used to numerically analyze the acoustic field. The reliability of this model was verified by comparing the results generated with those from experiments. The MRT-LBM model gave new insight into conventional acoustic numerical simulations and provided significant indications for USCR parameter optimization. The USCR demonstrated its feasibility for application in HIFU treatment or in other fields that demand high-precision focusing.
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Acoustic field of an ultrasonic cavity resonator with two open ends: Experimental measurements and lattice Boltzmann method modeling
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28 March 2017
Research Article|
March 28 2017
Acoustic field of an ultrasonic cavity resonator with two open ends: Experimental measurements and lattice Boltzmann method modeling
Feng Shan;
Feng Shan
1Key Laboratory of Modern Acoustics (MOE), School of Physics, Collaborative Innovation Center of Advanced Microstructure,
Nanjing University
, No. 22 Hankou Road, Gulou District, Nanjing 210093, China
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Juan Tu;
Juan Tu
1Key Laboratory of Modern Acoustics (MOE), School of Physics, Collaborative Innovation Center of Advanced Microstructure,
Nanjing University
, No. 22 Hankou Road, Gulou District, Nanjing 210093, China
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Jianchun Cheng
;
Jianchun Cheng
1Key Laboratory of Modern Acoustics (MOE), School of Physics, Collaborative Innovation Center of Advanced Microstructure,
Nanjing University
, No. 22 Hankou Road, Gulou District, Nanjing 210093, China
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Dong Zhang;
Dong Zhang
a)
1Key Laboratory of Modern Acoustics (MOE), School of Physics, Collaborative Innovation Center of Advanced Microstructure,
Nanjing University
, No. 22 Hankou Road, Gulou District, Nanjing 210093, China
2
State Key Laboratory of Acoustics
, Chinese Academy of Science, No. 21 North 4th Ring Road, Haidian District, Beijing 10080, China
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Faqi Li;
Faqi Li
3State Key Laboratory of Ultrasound Engineering in Medicine Co-founded by Chongqing and the Ministry of Science and Technology, School of Biomedical Engineering,
Chongqing Medical University
, No. 1 Yixueyuan Road, Yuzhong District, Chongqing 401121, China
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Zhibiao Wang
Zhibiao Wang
b)
3State Key Laboratory of Ultrasound Engineering in Medicine Co-founded by Chongqing and the Ministry of Science and Technology, School of Biomedical Engineering,
Chongqing Medical University
, No. 1 Yixueyuan Road, Yuzhong District, Chongqing 401121, China
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a)
Electronic mail: dzhang@nju.edu.cn
b)
Electronic mail: wangzb@cqmu.edu.cn
J. Appl. Phys. 121, 124502 (2017)
Article history
Received:
November 01 2016
Accepted:
February 22 2017
Citation
Feng Shan, Juan Tu, Jianchun Cheng, Dong Zhang, Faqi Li, Zhibiao Wang; Acoustic field of an ultrasonic cavity resonator with two open ends: Experimental measurements and lattice Boltzmann method modeling. J. Appl. Phys. 28 March 2017; 121 (12): 124502. https://doi.org/10.1063/1.4978013
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