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Effect of secondary radiation force on aggregation between encapsulated microbubbles |
Zhang Yan-Li(张艳丽)a), Zheng Hai-Rong(郑海荣)b),Tang Meng-Xing(汤孟兴)c), and Zhang Dong(章东)a)† |
a Key Laboratory of Modern Acoustics of Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China; b Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518067, China; c Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK |
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Abstract Secondary radiation force can be an attractive force causing aggregates of encapsulated microbubbles in ultrasonic molecular imaging. The influence of the secondary radiation force on aggregation between two coated bubbles is investigated in this study. Numerical calculations are performed based on four simultaneous differential equations of radial and translational motions. Results show that the secondary force can change from attraction to repulsion during approach, and stable microbubble pairs can be formed in the vicinity of resonant regions; the possibility of microbubble aggregations can be reduced by using low exciting amplitude, ultrasonic frequencies deviating from the resonant frequencies or microbubbles with small compressibility.
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Received: 08 April 2011
Revised: 05 May 2011
Accepted manuscript online:
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PACS:
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43.35.Mr
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(Acoustics of viscoelastic materials)
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43.35.Wa
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(Biological effects of ultrasound, ultrasonic tomography)
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2011CB707900), the National Natural Science
Foundation of China (Grant Nos. 10974093, 11011130201, and 10904094), the Fundamental Research Funds for the Central
Universities of China (Grant Nos. 1103020402, 1116020410, and 1112020401), the Prior Academic Program Development of
Jiangsu Higher Education Institutions, China, and the State key Laboratory of Acoustics of Ministry of Education, China. |
Cite this article:
Zhang Yan-Li(张艳丽), Zheng Hai-Rong(郑海荣), Tang Meng-Xing(汤孟兴), and Zhang Dong(章东) Effect of secondary radiation force on aggregation between encapsulated microbubbles 2011 Chin. Phys. B 20 114302
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