A Spectral Analysis Technique in Ultrasound Transducer Characterization

Lewin, Peter A.; Pedersen, Peder J.; Schafer, Mark E.

doi:10.1109/ultsym.1984.198399

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…The transducer characterization has historically been performed by dedicated pulsers, emitting extremely short pulse [1]- [5], discrete frequency tones [6], [7] or linear frequency sweeps [8], [9]. In all of these cases, it has been assumed that the transducer elements are identical.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Medical Ultrasound Transducers

Tomov

Diederichsen

Thomsen

et al. 2018

2018 IEEE International Ultrasonics Symposium (IUS)

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Optimal use of multi-element ultrasound transducers requires knowledge of the performance of their individual elements, for realistic simulation and optimized beamforming. When developing transducers, it is critical to characterize the performance of the transducer material itself, removing the effect of the transducer element size and geometry. To provide that level of knowledge, a measurement and characterization algorithm was developed and applied on several transducers. The individual elements were characterized consistently along the transducer length, and element spatial deviations were measured with µm precision, confirming the precision of the method.

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Section: Introductionmentioning

confidence: 99%

Characterization of Medical Ultrasound Transducers

Tomov

Diederichsen

Thomsen

et al. 2018

2018 IEEE International Ultrasonics Symposium (IUS)

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“…Calibration Techniaues The technique for calibrating the hydrophones is based on the Time Delay Spectrometry (TDS) technique [17,18]. With the TDS technique, a swept sinusoidal signal from a spectrum analyzer is amplified and fed to a wideband acoustic source.…”

Section: Acoustical Characterizationmentioning

confidence: 99%

Design of a miniature in-vivo shock wave hydrophone

Schafer

Kraynak

Lewin³

IEEE Symposium on Ultrasonics

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The purpose of this work is the development of a miniature precision acoustic sensor (hydrophone) which would survive in an in-vivo shock wave field. The immediate application of the device is in improving the safety and efficacy of Extracorporeal Shockwave Lithotripsy (ESL) treatment of kidney and gallbladder stones. The hydrophone is designed for insertion into the body using a catheter or biopsy needle, in order to provide reliable in-vivo acoustic pressure measurements of ESL. The research efforts to date include 1) theoretical modeling to examine design trade-offs associated with material choice and sensor configuration; 2) prototype construction; and 3) acoustical performance characterization. The results of prototype testing will be shown, and will be compared to existing hydrophone designs. Performance differences involve bandwidth, directivity, and survivability under shock wave exposure. The fundamental difficulty is improving survivability without sacrificing bandwidth or signal fidelity.

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Wide-band piezoelectric polymer acoustic sources

Lewin

Schafer

1988

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The design of a wideband acoustic source made of the piezoelectric polymer polyvinylidine fluoride (PVDF) is described. The source was developed for the characterization and absolute calibration of ultrasonic hydrophone probes. Construction details are described and performance characteristics of the wideband PVDF transmitter, including its transmitting voltage response and directivity patterns, are compared with theoretical predictions in the frequency range up to 40 MHz. The Krimholtz-Leedom-Mattaei (KLM) model was used to examine the influence of the PVDF polymer film thickness, the backing acoustic impedance, the cable length, and the electrical source resistance on overall transmit transfer characteristics. A comparison is made with traditional piezoelectric ceramic acoustic sources, and it is shown that piezopolymer transmitters exhibit some improved properties and are well suited for certain ultrasound dosimetry applications. In particular, the polymer sources have been found useful in measurements based on swept-frequency excitation. Those measurements allow characterization of transmitters and receivers to be performed as a virtually continuous function of frequency.

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A Spectral Analysis Technique in Ultrasound Transducer Characterization

Cited by 5 publications

References 15 publications

Characterization of Medical Ultrasound Transducers

Characterization of Medical Ultrasound Transducers

Design of a miniature in-vivo shock wave hydrophone

Wide-band piezoelectric polymer acoustic sources

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