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Hybrid multi/single layer array transducers for increased signal-to-noise ratio.

Publication ,  Journal Article
Goldberg, RL; Emery, CD; Smith, SW
Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control
January 1997

In medical ultrasound imaging, two-dimensional (2-D) array transducers are necessary to implement dynamic focusing in two dimensions, phase correction in two dimensions and high speed volumetric imaging. However, the small size of a 2-D array element results in a small clamped capacitance and a large electrical impedance, which decreases the transducer signal-to-noise ratio (SNR). We have previously shown that SNR is improved using transducers made from multi-layer PZT, due to their lower electrical impedance. In this work, we hypothesize that SNR is further increased using a hybrid array configuration: in the transmit mode, a 10 Omega electronic transmitter excites a 10 Omega multi-layer array element; in the receive mode, a single layer element drives a high impedance preamplifier located in the transducer handle. The preamplifier drives the coaxial cable connected to the ultrasound scanner. For comparison, the following control configuration was used: in the transmit mode, a 50 Omega source excites a single layer element, and in the receive mode, a single layer element drives a coaxial cable load. For a 5x102 hybrid array operating at 7.5 MHz, maximum transmit output power was obtained with 9 PZT layers according to the KLM transmission line model. In this case, the simulated pulse-echo SNR was improved by 23.7 dB for the hybrid configuration compared to the control. With such dramatic improvement in pulse-echo SNR, low voltage transmitters can be used. These can be fabricated on integrated circuits and incorporated into the transducer handle.

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Published In

IEEE transactions on ultrasonics, ferroelectrics, and frequency control

DOI

EISSN

1525-8955

ISSN

0885-3010

Publication Date

January 1997

Volume

44

Issue

2

Start / End Page

315 / 325

Related Subject Headings

  • Acoustics
  • 51 Physical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
 

Citation

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Goldberg, R. L., Emery, C. D., & Smith, S. W. (1997). Hybrid multi/single layer array transducers for increased signal-to-noise ratio. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 44(2), 315–325. https://doi.org/10.1109/58.585116
Goldberg, R. L., C. D. Emery, and S. W. Smith. “Hybrid multi/single layer array transducers for increased signal-to-noise ratio.IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 44, no. 2 (January 1997): 315–25. https://doi.org/10.1109/58.585116.
Goldberg RL, Emery CD, Smith SW. Hybrid multi/single layer array transducers for increased signal-to-noise ratio. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 1997 Jan;44(2):315–25.
Goldberg, R. L., et al. “Hybrid multi/single layer array transducers for increased signal-to-noise ratio.IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 44, no. 2, Jan. 1997, pp. 315–25. Epmc, doi:10.1109/58.585116.
Goldberg RL, Emery CD, Smith SW. Hybrid multi/single layer array transducers for increased signal-to-noise ratio. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 1997 Jan;44(2):315–325.

Published In

IEEE transactions on ultrasonics, ferroelectrics, and frequency control

DOI

EISSN

1525-8955

ISSN

0885-3010

Publication Date

January 1997

Volume

44

Issue

2

Start / End Page

315 / 325

Related Subject Headings

  • Acoustics
  • 51 Physical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences