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High-frequency annular array fabrication using a flex circuit matching layer.

Holly S Lay1, Eric A Simpson, Greg Griffin

  • 1Sonavation, Inc., Palm Beach Gardens, FL, USA. Holly.Lay@sonavation.com

Ultrasonic Imaging
|September 14, 2012
PubMed
Summary
This summary is machine-generated.

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This study introduces a simple, inexpensive method for fabricating high-frequency annular arrays for medical imaging. The new technique reduces electrical losses, enabling cost-effective, high-performance ultrasound arrays for applications like intravascular imaging.

Area of Science:

  • Ultrasound transducer technology
  • Medical imaging array fabrication
  • Materials science for acoustics

Background:

  • High-frequency annular arrays are crucial for advanced medical imaging applications, including intravascular and ophthalmic imaging.
  • Existing fabrication methods face challenges in achieving miniaturization, cost-effectiveness, and reduced electrical losses.
  • Intravascular imaging arrays require small, disposable, and affordable designs.

Purpose of the Study:

  • To present a novel, simple, and inexpensive method for fabricating high-frequency annular arrays.
  • To address the challenges of electrical losses in bonding matching layers to transducer substrates.
  • To demonstrate the feasibility of the new fabrication technique for medical imaging applications.

Main Methods:

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  • Utilized a polyimide quarter-wavelength matching layer with an electrode pattern on its back surface.
  • Glued the matching layer to a ceramic transducer substrate (PZT5H).
  • Reduced electrical losses by employing a second set of electrodes on the transducer substrate and anisotropic conductive epoxy for bonding.

Main Results:

  • Successfully fabricated a seven-element, 20-MHz, 5-mm diameter annular array prototype.
  • Achieved a pulse with a -6-dB fractional bandwidth of 50%.
  • Observed an insertion loss of 22 dB and secondary lobes reduced to -65 dB.

Conclusions:

  • The developed fabrication method is simple, inexpensive, and effective for producing high-frequency annular arrays.
  • The technique successfully minimizes electrical losses, enhancing array performance.
  • The prototype demonstrates potential for cost-effective, high-performance ultrasound arrays in demanding imaging applications.