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Proceedings Paper

Fabrication of a conformal ring-annular ultrasound array
Author(s): Aaron E. Dann; David B. Bennett; Rahul S. Singh; Jean-Jacques Lemaire; Warren S. Grundfest; Martin O. Culjat
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Paper Abstract

This paper presents the fabrication of a conformal, ring-annular ultrasound imaging array. Two-dimensional (2D) ultrasound scanning is possible with ring-annular array transducers in which a number of piezoelectric elements are arranged in a circle. The 2D scanning technique can be realized through time delays, potentially allowing for 3D imaging. Ring-annular array transducers have previously been shown to have increased bandwidth, better signal-to-noise, and uniform scanning in space in contrast to 2D matrix arrays of an equal number elements and aperture size. Conformal, ring-annular transducers have the ability to match the curvature of body surfaces, and have the additional advantage that the flexible array elements can be mechanically focused to provide enhanced focusing capabilities relative to rigid ring-annular arrays. The process developed for the fabrication of conformal, ring-annular ultrasound array is presented. A microfabrication approach is used to produce ring-annular arrays featuring flexible joints with high durability, and capable of scaling in size and element architectures. The fabrication process yields a ring of piezoelectric transducer elements held together with polyimide, which is the basis of the flexible joints that enable conformal ultrasonography. The described fabrication process is used to produce a ring-annular array with a single ring containing piezoelectric elements, but the process can be extended to form arrays with multiple annular-rings of varying sizes. The transducer had a fundamental thickness-mode resonant frequency of 12 MHz, a 6 dB bandwidth of 23%, and an acoustic pulse width of 1.8 μs in water.

Paper Details

Date Published: 12 March 2010
PDF: 8 pages
Proc. SPIE 7629, Medical Imaging 2010: Ultrasonic Imaging, Tomography, and Therapy, 76290R (12 March 2010); doi: 10.1117/12.844634
Show Author Affiliations
Aaron E. Dann, Ctr. for Advanced Surgical and Interventional Technology, Univ. of California, Los Angeles (United States)
Univ. of California, Los Angeles (United States)
David B. Bennett, Ctr. for Advanced Surgical and Interventional Technology, Univ. of California, Los Angeles (United States)
Univ. of California, Los Angeles (United States)
Rahul S. Singh, Ctr. for Advanced Surgical and Interventional Technology, Univ. of California, Los Angeles (United States)
Univ. of California, Los Angeles (United States)
Univ. of California, Santa Barbara (United States)
Jean-Jacques Lemaire, Ctr. Hospitalier Universitaire de Clermont-Ferrand, Clermont Univ. (France)
Univ. d'Auvergne (France)
Warren S. Grundfest, Ctr. for Advanced Surgical and Interventional Technology, Univ. of California, Los Angeles (United States)
Univ. of California, Los Angeles (United States)
Martin O. Culjat, Ctr. for Advanced Surgical and Interventional Technology, Univ. of California, Los Angeles (United States)
Univ. of California, Los Angeles (United States)
Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 7629:
Medical Imaging 2010: Ultrasonic Imaging, Tomography, and Therapy
Jan D'hooge; Stephen A. McAleavey, Editor(s)

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