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Related Experiment Videos

Multilayer piezoelectric ceramics for two-dimensional array transducers.

R L Goldberg1, S W Smith

  • 1Dept. of Biomed. Eng., Duke Univ., Durham, NC.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1994
PubMed
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Multilayer ceramic (MLC) elements improve medical ultrasound transducer sensitivity by reducing electrical impedance. This enables higher frequency imaging and greater range compared to traditional single-layer designs.

Area of Science:

  • Medical Ultrasound Imaging
  • Materials Science
  • Electrical Engineering

Background:

  • 2-D array transducers are crucial for advanced ultrasound capabilities like volumetric scanning.
  • Small element size in conventional transducers leads to high impedance and poor sensitivity.
  • High impedance mismatch between transducer elements and circuitry limits imaging performance.

Purpose of the Study:

  • To investigate the use of multilayer ceramic (MLC) structures to enhance ultrasound transducer performance.
  • To improve the sensitivity and reduce insertion loss of 2-D array elements.
  • To demonstrate the feasibility of MLC arrays for improved medical ultrasound imaging.

Main Methods:

  • Fabrication of a 3x43 phased-array transducer using 3-layer PZT-5H MLC elements.

Related Experiment Videos

  • Utilized thick film technology with plated-through vias for electrical interconnection.
  • Compared the performance (impedance, insertion loss) of MLC arrays against single-layer control arrays.
  • Acquired B-scan images of phantoms and in vivo kidney for signal-to-noise ratio assessment.

    • Main Results:

    • MLC elements exhibited significantly lower electrical impedance (100 Omega) compared to control elements (800 Omega) at 2.25 MHz.
    • MLC arrays achieved lower round-trip insertion loss (24.0 dB) than control arrays (34.1 dB).
    • Ultrasound images acquired with MLC arrays showed a higher signal-to-noise ratio.

    Conclusions:

    • Multilayer ceramic structures effectively reduce electrical impedance and insertion loss in 2-D array ultrasound transducers.
    • MLC technology enables improved sensitivity, leading to higher signal-to-noise ratios in ultrasound images.
    • 2-D arrays made of MLCs can facilitate higher frequency and longer-range medical ultrasound imaging.