國家衛生研究院 NHRI:Item 3990099045/6916

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Title:	Experimental analysis of 1-3 piezocomposites for high-intensity focused ultrasound transducer applications
Authors:	Chen, GS;Liu, HC;Lin, YC;Lin, YL
Contributors:	Division of Medical Engineering Research
Abstract:	Piezocomposites with 1-3 connectivity have been extensively used in medical imaging transducers and high-intensity focused ultrasound transducers, but most studies of 1-3 piezocomposites address medical imaging applications. The purpose of this study was to completely investigate 1-3 composites specifically for high-power ultrasonic transducer applications via a series of experimental analyses. PZT4-epoxy composite focused transducers with various aspect ratios and volume fractions were constructed in-house for the evaluation of the coupling factor, dielectric loss tangent, quality factor, bandwidth, acoustic impedance and electro-acoustic efficiency. The experimental analyses demonstrated that although the coupling factor of composite transducers was higher than that of the ceramic transducer, the composite transducers had a lower efficiency due to the high dielectric loss and high mechanical energy loss of the composites. In addition, the bandwidth and acoustic impedance of composite transducers were superior to the ceramic transducer. For the composite transducers, the efficiency and acoustic impedance were inversely proportional to the aspect ratio and linearly proportional to the volume fraction. The coupling of inter pillars that are too close to each other could cause a significant decrease in the efficiency of the composite transducer. With an appropriate design in terms of the aspect ratio, volume fraction and PZT-pillar spacing, a high-efficiency composite high-intensity focused ultrasound transducer can be achieved.
Date:	2013-01
Relation:	IEEE Transactions on Biomedical Engineering. 2013 Jan;60(1):128-134.
Link to:	http://dx.doi.org/10.1109/TBME.2012.2226881
JIF/Ranking 2023:	http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0018-9294&DestApp=IC2JCR
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:000312897600017
Cited Times(Scopus):	http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84871744343
Appears in Collections:	[Gin-Shin Chen] Periodical Articles

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