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Qiu, Zhen; Qiu, Yongqiang; Demore, Christine E.M.; Cochran, Sandy (2016)
Publisher: Elsevier
Languages: English
Types: Article
The higher performance of relaxor-based piezocrystals compared with piezoceramics is now well established, notably including improved gain-bandwidth product, and these materials have been adopted widely for biomedical ultrasound imaging. However, their use in other applications, for example as a source of focused ultrasound for targeted drug delivery, is hindered in several ways. One of the issues, which we consider here, is in shaping the material into the spherical geometries used widely in focused ultrasound. Unlike isotropic unpoled piezoceramics that can be shaped into a monolithic bowl then poled through the thickness, the anisotropic structure of piezocrystals make it impossible to machine the bulk crystalline material into a bowl without sacrificing performance. Instead, we report a novel faceted array, inspired by the geodesic dome structure in architecture, which utilizes flat piezocrystal material and maximizes fill factor. Aided by 3D printing, a prototype with f# ≈ 1.2, containing 96 individually addressable elements was manufactured using 1-3 connectivity PMN-PT piezocrystal - epoxy composite. The fabrication process is presented and the array was connected to a 32-channel controller to shape and steer the beam for preliminary performance demonstration. At an operating frequency of 1 MHz, a focusing gain around 30 was achieved and the side lobe intensities were all at levels below -12 dB compared to main beam. We conclude that, by taking advantage of contemporary fabrication techniques and driving instrumentation, the geodesic array configuration is suitable for focused ultrasound devices made with piezocrystal.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • [1] [2] [3] [4] [5] [6] [7] [8] J. E. Kennedy, "High-intensity focused ultrasound in the treatment of solid tumours.," Nature Review Cancer, vol.
    • 5, pp. 321-7, 2005.
    • T. M. Allen, "Liposomes. Opportunities in drug delivery," Drugs, vol. 54 Suppl 4, pp. 8-14, 1997.
    • H. M. Hertz, "Standing‐wave acoustic trap for nonintrusive positioning of microparticles," Journal of Applied Physics, vol. 78, pp. 4845-4849, 1995.
    • D. R. Daum and K. Hynynen, "A 256-element ultrasonic phased array system for the treatment of large volumes of deep seated tissue," Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on, vol. 46, pp.
    • E. S. Ebbini and C. A. Cain, "A spherical-section ultrasound phased array applicator for deep localized hyperthermia," Biomedical Engineering, IEEE Transactions on, vol. 38, pp. 634-643, 1991.
    • V. Auboiroux, E. Dumont, L. Petrusca, M. Viallon, and R. Salomir, "An MR-compliant phased-array HIFU transducer with augmented steering range, dedicated to abdominal thermotherapy," Physics in Medicine and Biology, vol. 56, pp. 3563-82, 2011.
    • Y. Qiu, H. Wang, C. E. Demore, D. A. Hughes, P. Glynne-Jones, S. Gebhardt, et al., "Acoustic devices for particle and cell manipulation and sensing," Sensors (Basel), vol. 14, pp. 14806-38, 2014.
    • P. Sun, G. Wang, D. Wu, B. Zhu, C. Hu, C. Liu, et al., "High Frequency PMN-PT 1-3 Composite Transducer for Ultrasonic Imaging Application," Ferroelectrics, vol. 408, pp. 120-128, 2010.
    • M. F. Wallace, H. Mulvana, P. Marin, K. Mayne, M. P. Walsh, R. Wright, et al., "Parametric Array Design and Characterisation for Underwater Sonar and Medical Strain Imaging Applications," in Ultrasonics Symposium, 2007. IEEE, 2007, pp. 305-308.
    • Y. Chen, K.-H. Lam, D. Zhou, Q. Yue, Y. Yu, J. Wu, et al., "High Performance Relaxor-Based Ferroelectric Single Crystals for Ultrasonic Transducer Applications," Sensors, vol. 14, p. 13730, 2014.
    • S. Zhang, S.-M. Lee, D.-H. Kim, H.-Y. Lee, and T. R. Shrout, "Elastic, Piezoelectric, and Dielectric Properties of 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 Crystals Obtained by Solid-State Crystal Growth," Journal of the American Ceramic Society, vol. 91, pp. 683-686, 2008.
    • Z. Qiu, M. R. Sadiq, C. Demore, M. F. Parker, P. Marin, K. Mayne, et al., "Characterization of piezocrystals for practical configurations with temperature- and pressure-dependent electrical impedance spectroscopy," Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on, vol. 58, pp. 1793-1803, 2011.
    • 61, pp. 1559-1574, 2014.
    • B. I. Raju, C. S. Hall, and R. Seip, "Ultrasound therapy transducers with space-filling non-periodic arrays," Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on, vol. 58, pp. 944-954, 2011.
    • Q. Zhou, X. Xu, E. J. Gottlieb, L. Sun, J. M. Cannata, H. Ameri, et al., "PMN-PT single crystal, high-frequency ultrasonic needle transducers for pulsed-wave Doppler application," Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on, vol. 54, pp. 668-675, 2007.
    • K. H. Lam, Y. Chen, K. F. Cheung, and J. Y. Dai, "PMN-PT single crystal focusing transducer fabricated using a mechanical dimpling technique," Ultrasonics, vol. 52, pp. 20-24, 1// 2012.
    • W. A. Smith, "The role of piezocomposites in ultrasonic transducers," in Ultrasonics Symposium, 1989.
    • Proceedings., IEEE 1989, 1989, pp. 755-766 vol.2.
    • G. Harvey, A. Gachagan, J. W. Mackersie, T. McCunnie, and R. Banks, "Flexible ultrasonic transducers incorporating piezoelectric fibres," Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on, vol. 56, pp. 1999-2009, 2009.
    • B. Carlo, "The Wooden Roofs of Leonardo and New Structural Research," Nexus Network Journal: Architecture and Mathematics, vol. 10, pp. 27-38, 2008.
    • A. L. Bernassau, D. Hutson, C. E. Demore, and S. Cochran, "Characterization of an epoxy filler for piezocomposites compatible with microfabrication processes," IEEE Trans Ultrason Ferroelectr Freq Control, vol. 58, pp. 2743-8, Dec 2011.
    • S. Zhang and T. R. Shrout, "Relaxor-PT single crystals: observations and developments," Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on, vol. 57, pp. 2138-2146, 2010.
    • Z. Qiu, R. Habeshaw, S. Cochran, and L. Dave, "Customized modular multichannel electronics for ultrasoundmediated targeted drug delivery with a geodesic piezocrystal phased array," in Ultrasonics Symposium (IUS), 2014 IEEE International, 2014, pp. 811-814.
    • X. Liao, Z. Qiu, T. Jiang, M. Sadiq, Z. Huang, C. Demore, et al., "Functional Piezocrystal Characterisation under Varying Conditions," Materials, vol. 8, p. 5456, 2015.
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