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High frequency imaging transducers from hollow spheres

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6 Author(s)
R. Meyer ; Mater. Res. Lab., Pennsylvania State Univ., University Park, PA, USA ; S. Alkoy ; W. Chen ; T. Ritter
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Single element transducers were designed and built using shelf sections of piezoelectric hollow spheres. The shell sections provide inherent focal depths and allow for the easy production of low f-number transducers. Because of the low f-numbers, these transducers have improved lateral resolution compared to other transducers operating at the same frequency. Spheres were mass-produced using the sacrificial core technique and had diameters of 1-3 mm and wall thickness from 20 to 120 μm. The lead titanate transducers described here had thickness mode resonance frequencies ranging from 25 MHz to 70 MHz. Electromechanical properties and pulse-echo response of these transducers were evaluated. Skin images taken with an Ultrasonic Backscatter Microscope at 55 MHz are also presented

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Applications of Ferroelectrics, 2000. ISAF 2000. Proceedings of the 2000 12th IEEE International Symposium on  (Volume:2 )

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