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PMN-PT single crystal, high-frequency ultrasonic needle transducers for pulsed-wave Doppler application

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9 Author(s)
Qifa Zhou ; Dept. of Biomed. Eng., Univ. of Southern California, Los Angeles, CA ; Xiaochen Xu ; Emanuel J. Gottlieb ; Lei Sun
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High-frequency needle ultrasound transducers with an aperture size of 0.4 mm were fabricated using lead magnesium niobate-lead titanate (PMN-33%PT) as the active piezoelectric material. The active element was bonded to a conductive silver particle matching layer and a conductive epoxy backing through direct contact curing. An outer matching layer of parylene was formed by vapor deposition. The active element was housed within a polyimide tube and a 20-gauge needle housing. The magnitude and phase of the electrical impedance of the transducer were 47 Omega and -38deg, respectively. The measured center frequency and -6 dB fractional bandwidth of the PMN-PT needle transducer were 44 MHz and 45%, respectively. The two-way insertion loss was approximately 15 dB. In vivo high-frequency, pulsed-wave Doppler patterns of blood flow in the posterior portion and in vitro ultrasonic backscatter microscope (UBM) images of the rabbit eye were obtained with the 44-MHz needle transducer

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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control  (Volume:54 ,  Issue: 3 )