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5 November 1992 Dual frequency piezoelectric transducer for medical applications
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Abstract
Recent advances in the field of medical ultrasound requires a dual frequency transducer capable of operation at two frequencies. This is usually achieved by having a broadband transducer which can be excited at two different frequencies. Such frequency characteristics will allow echo-amplitude imaging at the higher frequency where a high resolution is required and color flow imaging (CFI) at the lower frequency for improved sensitivity. In this paper a novel dual frequency transducer design, demonstrating two distinct resonance, is presented. This is achieved by varying the geometry of the piezoelectric ceramic in a manner which results in two distinct thickness mode resonance. The results showing the temporal characteristics of such transducer are presented. The parameters influencing the temporal response of this transducer are discussed. It is also shown that the two resonance frequencies are independent. Finally, the advantages of this new design over the conventional techniques are discussed.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. S.S. Bolorforosh "Dual frequency piezoelectric transducer for medical applications", Proc. SPIE 1733, New Developments in Ultrasonic Transducers and Transducer Systems, (5 November 1992); https://doi.org/10.1117/12.130593
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