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Optimization of signal-to-noise ratio for multilayer PZT transducers.

Publication ,  Journal Article
Goldberg, RL; Smith, SW
Published in: Ultrasonic imaging
April 1995

In medical ultrasound imaging, two-dimensional (2-D) array transducers are desirable to implement dynamic focusing and phase aberration correction in two dimensions as well as volumetric imaging. Unfortunately, the small size of a 2-D array element results in a small clamped capacitance and a large electrical impedance near the resonance frequency. This results in poor signal-to-noise ratio (SNR) of the array elements. It has previously been demonstrated that transducers made from multilayer PZT ceramics have lower electrical impedance and greater SNR than comparable single layer elements. A simplified circuit model has been developed to optimize the SNR for multilayer ceramic (MLC) transducers. In this model, an electronic transmitter excites the array element and in the receive mode, the element drives a coaxial cable load terminated by a high impedance preamplifier. The transducer impedance is Zt/N2, where N is the number of piezoelectric layers. Maximum transmit signal is obtained when N = Ntx such that the transducer impedance, Zt/Ntx2, is matched to the source impedance. Maximum receive signal is obtained when N = Nrx such that the transducer impedance, Zt/Nrx2, is matched to the coaxial cable reactance. For maximum pulse-echo signal, the transducer should be designed with N = square root of Ntx Nrx, the geometric mean of Ntx and Nrx. Using this optimization technique, a 1.5-D array was designed with 3 layers for maximum pulse-echo SNR. Results of simulations from the simplified circuit analysis were consistent with those of the KLM model. The 3 layer array was fabricated as well as a single layer control array. The measured transmit signal and receive signal agreed with the simulation results.

Duke Scholars

Published In

Ultrasonic imaging

DOI

EISSN

1096-0910

ISSN

0161-7346

Publication Date

April 1995

Volume

17

Issue

2

Start / End Page

95 / 113

Related Subject Headings

  • Ultrasonography
  • Transducers
  • Humans
  • Electric Impedance
  • Ceramics
  • Acoustics
  • 4003 Biomedical engineering
  • 0903 Biomedical Engineering
 

Citation

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ICMJE
MLA
NLM
Goldberg, R. L., & Smith, S. W. (1995). Optimization of signal-to-noise ratio for multilayer PZT transducers. Ultrasonic Imaging, 17(2), 95–113. https://doi.org/10.1177/016173469501700202
Goldberg, R. L., and S. W. Smith. “Optimization of signal-to-noise ratio for multilayer PZT transducers.Ultrasonic Imaging 17, no. 2 (April 1995): 95–113. https://doi.org/10.1177/016173469501700202.
Goldberg RL, Smith SW. Optimization of signal-to-noise ratio for multilayer PZT transducers. Ultrasonic imaging. 1995 Apr;17(2):95–113.
Goldberg, R. L., and S. W. Smith. “Optimization of signal-to-noise ratio for multilayer PZT transducers.Ultrasonic Imaging, vol. 17, no. 2, Apr. 1995, pp. 95–113. Epmc, doi:10.1177/016173469501700202.
Goldberg RL, Smith SW. Optimization of signal-to-noise ratio for multilayer PZT transducers. Ultrasonic imaging. 1995 Apr;17(2):95–113.
Journal cover image

Published In

Ultrasonic imaging

DOI

EISSN

1096-0910

ISSN

0161-7346

Publication Date

April 1995

Volume

17

Issue

2

Start / End Page

95 / 113

Related Subject Headings

  • Ultrasonography
  • Transducers
  • Humans
  • Electric Impedance
  • Ceramics
  • Acoustics
  • 4003 Biomedical engineering
  • 0903 Biomedical Engineering