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According to the ultrasonic propagation characteristics in the multi-medium, a control method of ultrasonic focus in the multi-medium is presented through introducing the phase compensation factors and using genetic algorithm. The patterns of multi-focus ultrasonic field generated by two-dimensional phased array consisting of 1616 elements are simulated in multi-biological tissue, and the ultrasonic fields are calculated under the various thicknesses and the various absorption coefficients of medium layer. The results show that this approach can optimize the patterns of multi-focus ultrasonic field and restrain side-lobe, which can improve the ultrasonic intensity gain and make the maximal ultrasonic intensity focus on the target area. When the thickness and the absorption coefficient of biological tissue are changed, the focus position remains unchanged, but the ultrasonic intensity of the focus area will change relatively.
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Keywords:
- phased array /
- multi-layer medium /
- sound field optimization /
- genetic algorithm
[1] Lu M Z, Wan M X 2001 Acta Phys. Sin. 50 347 (in Chinese) [陆明珠, 万明习 2001 50 347]
[2] Huo J, Shi K R 2005 Acta Acustica 30 207 (in Chinese) [霍健, 施克仁 2005 声学学报 30 207]
[3] Jessi E J, Paolo F M 2006 IEEE Trans. Biom. Eng. 53 1006
[4] Umemura S, Cain C A 1989 IEEE Trans. Ultrason. Ferro. Freq. Contr. 36 49
[5] Hu J W, Qian S Y, Ding Y J 2010 Ultrasonics 50 628
[6] N'Djin W A, Melodelima D, Parmentier H 2008 Ultrasound Med. Biol. 34 1934
[7] Mohammed S, Charles A 1989 IEEE Trans. Ultrason. Ferro. Freq. Contr. 36 3
[8] Ebbini E S, Cain C A 1989 IEEE Trans. Ultrason. Ferro. Freq. Contr. 36 540
[9] Ji X, Shen G F, Bai J F 2011 Shanghai Jiaotong Univ. (Sci.) 16 55
[10] Meng T T, Chang M C, Chauhan S 2006 Biomedical and Pharmaceutical Engineering. ICBPE. 564
[11] Khaldon L, Luay F, Osama A 2009 Med. Biol. Eng. Comput. 47 635
[12] Hu J W, Qian S Y, Ding Y J 2010 J. Sys. Simu. 22 1111 (in Chinese) [胡继文, 钱盛友, 丁亚军 2010 系统仿真学报 22 1111]
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[1] Lu M Z, Wan M X 2001 Acta Phys. Sin. 50 347 (in Chinese) [陆明珠, 万明习 2001 50 347]
[2] Huo J, Shi K R 2005 Acta Acustica 30 207 (in Chinese) [霍健, 施克仁 2005 声学学报 30 207]
[3] Jessi E J, Paolo F M 2006 IEEE Trans. Biom. Eng. 53 1006
[4] Umemura S, Cain C A 1989 IEEE Trans. Ultrason. Ferro. Freq. Contr. 36 49
[5] Hu J W, Qian S Y, Ding Y J 2010 Ultrasonics 50 628
[6] N'Djin W A, Melodelima D, Parmentier H 2008 Ultrasound Med. Biol. 34 1934
[7] Mohammed S, Charles A 1989 IEEE Trans. Ultrason. Ferro. Freq. Contr. 36 3
[8] Ebbini E S, Cain C A 1989 IEEE Trans. Ultrason. Ferro. Freq. Contr. 36 540
[9] Ji X, Shen G F, Bai J F 2011 Shanghai Jiaotong Univ. (Sci.) 16 55
[10] Meng T T, Chang M C, Chauhan S 2006 Biomedical and Pharmaceutical Engineering. ICBPE. 564
[11] Khaldon L, Luay F, Osama A 2009 Med. Biol. Eng. Comput. 47 635
[12] Hu J W, Qian S Y, Ding Y J 2010 J. Sys. Simu. 22 1111 (in Chinese) [胡继文, 钱盛友, 丁亚军 2010 系统仿真学报 22 1111]
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