Study on Discontinuity Properties of Phased-Array Ultrasound Transducer Affecting to Sound Pressure Fields Pattern

Authors: Tran Trong Thang, Nguyen Phan Kien, Trinh Quang Duc

Abstract:

The phased-array ultrasound transducer types are utilities for medical ultrasonography as well as optical imaging. However, their discontinuity characteristic limits the applications due to the artifacts contaminated into the reconstructed images. Because of the effects of the ultrasound pressure field pattern to the echo ultrasonic waves as well as the optical modulated signal, the side lobes of the focused ultrasound beam induced by discontinuity of the phased-array ultrasound transducer might the reason of the artifacts. In this paper, a simple method in approach of numerical simulation was used to investigate the limitation of discontinuity of the elements in phased-array ultrasound transducer and their effects to the ultrasound pressure field. Take into account the change of ultrasound pressure field patterns in the conditions of variation of the pitches between elements of the phased-array ultrasound transducer, the appropriated parameters for phased-array ultrasound transducer design were asserted quantitatively.

Keywords: Phased-array ultrasound transducer, sound pressure pattern, discontinuous sound field, numerical visualization.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1097026

References:

[1] W. Leutz, and G. Maret, “Ultrasonic Modulation of Multiply Scattered‐Light”, Physica B‐ Condensed Matter, 204(1‐4), 1995, pp.14‐19.
[2] M. Kobayashi, T. Mizumoto, Y. Shibuya, “Fluorescence tomography in turbid media based on acousto‐optic modulation imaging,” Applied Physics Letters, 89(18), 2006.
[3] Grinvald A, Lieke E, Frostig RD, Gilbert CD, Wiesel TN, “Functional Architecture of Cortex revealed by optical imaging of intrinsic signals”, Nature 324 (6095):1986, pp. 361 - 364
[4] Hao F Zhang, Konstantin Maslov, George Stoica, Lihong V Wang, “Functional photoacoustic microscopy for high-resolution and noninvasive in vivo imaging”, Nature Biotechnology 24, 2006, pp. 848 – 851.
[5] S. Gunadi, and T. S. Leung, “Spatial sensitivity of acousto‐optic and optical near‐infrared spectroscopy sensing measurements,” Journal of Biomedical Optics, 16(12), 127005‐10, 2011.
[6] Pu Wang, Justin R. Rajian, Ji-Xin Cheng, “Spectroscopic Imaging of Deep Tissue through Photoacoustic Detection of Molecular Vibration”, J.Phys.Chem.Lett, 4, 2013, pp. 2177−2185.
[7] K. Kirk Shung, Gary A. Thieme, “Ultrasonic Scattering in Biological Tissues”, CRC Press, 1992.
[8] Q. D. Trinh, Y. Nanbu, T. Suzuki, S. Takahashi, M. Takeda, M. Kobayashi, “Basic study on application of the phased-array transducer to determine fluorescence in turbid media based-on acousto-optic effects.” International Conference on Laser Applications in Life Sciences (LALS 2008).
[9] Q. D. Trinh, Y. Nanbu, T. Suzuki, S. Takahashi, M. Takeda, M. Kobayashi, “Fluorescence tomography based-on acousto-optic modulations with phased-array ultrasound transducer.” BiOS Part of SPIE Photonic West, paper No. 7177-57 (San Jose, USA, 2009).
[10] T.Q.Duc, S.Kaneta, M.Masaki, “Development of Ultrasonic Modulation Probe for Fluorescence Tomography Based on Acousto-Optic Effect.” International Journal Optic, Vol. 2011, 818302, pp. 1-6.
[11] T. Q. Duc, S. Kaneta, M. Kobayashi, “Study on the Mechanism of Ultrasonic Fluorescence Modulation in Light Scattering Medium Based on Diffusion Approximation with Varying Refractive Index.” Optical Review Vol. 19, No. 3, 2012, pp. 1-8.
[12] André LAMARRE, “Dynamic Focusing of Phased Arrays for Nondestructive Testing: Characterization and Application”, NDT.net, Vol. 4 No. 9, 1999.