A dual-layer micromachined PMN-PT 1-3 composite transducer for broadband ultrasound imaging

Broadband ultrasound imaging including tissue harmonic imaging usually captures acoustic information from the frequency higher than that of transmission waves, and has been widely studied in imaging for cardiology, bladder and other fluid-filled or cyst structures. Compared to the conventional pulse-echo method, the broadband imaging possesses the advantages including contrast resolution enhancement, artifacts reduction, and improved signal-to-noise ratio. However, those benefits require broadband ultrasound transducers. In this paper, a micromachined PMN-PT 1-3 composite based dual frequency transducer was designed, fabricated and characterized. The transmitting sensitivity at 17.5 MHz reached 40KPa/V, and the receiving spectra magnitude was compared with a calibrated hydrophone under same test transducer transmitting. These results hold great potential for medical broadband imaging applications.

[1]  Tai-Kyong Song,et al.  Coded excitation for ultrasound tissue harmonic imaging. , 2010, Ultrasonics.

[2]  L Pourcelot,et al.  Clinical use of ultrasound tissue harmonic imaging. , 1999, Ultrasound in medicine & biology.

[3]  X. Geng,et al.  5I-1 Microfabrication of Piezoelectric Composite Ultrasound Transducers (PC-MUT) , 2006, 2006 IEEE Ultrasonics Symposium.

[4]  W. Marsden.  I and J , 2012 .

[5]  Katherine W Ferrara,et al.  Ultrasound contrast microbubbles in imaging and therapy: physical principles and engineering , 2009, Physics in medicine and biology.

[6]  J.T. Yen,et al.  A dual-layer transducer array for 3-D rectilinear imaging , 2009, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[7]  L. Ratsimandresy,et al.  A high bandwidth transducer optimized for harmonic imaging , 2000, 2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121).

[8]  Paul A Dayton,et al.  High-resolution, high-contrast ultrasound imaging using a prototype dual-frequency transducer: In vitro and in vivo studies , 2010, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[9]  Jie Chen,et al.  Medical ultrasonic transducers with switchable frequency bands centered about f/sub 0/ and 2f/sub 0/ , 1997, 1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118).

[10]  R. Krimholtz,et al.  New equivalent circuits for elementary piezoelectric transducers , 1970 .

[11]  K. Nechvíle.  The High Resolution , 2005 .

[12]  C. Choy,et al.  Single crystal PMN-0.33PT/epoxy 1-3 composites for ultrasonic transducer applications , 2003, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.