[1] [1] M. Vogt, J. Opretzka, C. Perrey, H. Ermert, "Ultrasonic microscanning," Proc. IME H: J. Eng. Med. 224, 225-240 (2010).

[2] [2] K. K. Shung, M. Zippuro, "Ultrasonic transducers and arrays," Eng. Med. Biol. Mag. 15, 20-30 (1996).

[3] [3] D. W. Wu, Q. Zhou, X. Geng, C. G. Liu, F. Djuth, K. K. Shung, "Very high frequency (beyond 100 MHz) PZT kerfless linear arrays," IEEE Trans. Ultrason. Ferroelectrics Freq. Contr. 56, 2304-2310 (2009).

[4] [4] J. A. Brown, C. E. M. Demore, G. R. Lockwood, "Design and fabrication of annular arrays for high-frequency ultrasound," IEEE Trans. Ultrason. Ferroelectrics Freq. Contr. 51, 1010-1017 (2004).

[5] [5] Y. Qian, N. Harris, "Development of high frequency annular array with a novel structure for medical imaging," Procedia Eng. 5, 1276-1279 (2010).

[6] [6] K. A. Snook, H. Chang-Hong, T. R. Shrout, K. K. Shung, "High-frequency ultrasound annular-array imaging. Part I: Array design and fabrication," IEEE Trans. Ultrason. Ferroelectrics Freq. Contr. 53, 300-308 (2006).

[7] [7] Q. Zhou, J. Cha,Y. Huang, R. Zhang, W. Cao, K. K. Shung, "Alumina/epoxy nanocomposite matching layers for high-frequency ultrasound transducer application," IEEE Trans. Ultrason. Ferroelectrics Freq. Contr. 56, 213-219 (2009).

[8] [8] B. Hadimioglu, B. Khuri-Yakub, "Polymer films as acoustic matching layers," Ultrasonic Symposium, Vol. 3, pp. 1337-1340, IEEE (1990).

[9] [9] J. Peng, S. Lau, C. Chao, J. Dai, H. L. W. Chan, H. Luo, B. Zhu, Q. Zhou, K. Shung, "PMN-PT single crystal thick films on silicon substrate for highfrequency micromachined ultrasonic transducers," Appl. Phys. A: Mater. Sci. Process. 98, 233-237 (2010).

[10] [10] G. Wojcik, D. Vaughan, N. Abboud, J. Mould Jr, "Electromechanical modeling using explicit timedomain finite elements," Ultrasonic Symposium, Vol. 1102, pp. 1107-1112, IEEE (1993).