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Focused intravascular ultrasonic probe using dimpled transducer elements.

Y Chen1, W B Qiu2, K H Lam3

  • 1The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China; Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China.

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|August 11, 2014
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Summary
This summary is machine-generated.

This study fabricated high-frequency intravascular ultrasonic probes using a dimple technique. Lead-free KNN-KBT-Mn ceramic probes achieved superior axial resolution (44 μm) for enhanced medical imaging.

Keywords:
Dimple techniqueIntravascular ultrasoundLead-free ceramicPMN–PT single crystal

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Acoustic Engineering

Background:

  • Intravascular ultrasound (IVUS) requires high-frequency transducers for detailed imaging of blood vessels.
  • Developing advanced piezoelectric materials and fabrication techniques is crucial for improving IVUS probe performance.
  • Existing probes face limitations in resolution and material durability.

Purpose of the Study:

  • To fabricate and evaluate high-frequency focused intravascular ultrasonic probes using a novel dimple technique.
  • To compare the performance of probes made from lead-free KNN-KBT-Mn ceramic and traditional PMN-PT single crystal.
  • To assess the potential of the dimple technique for creating high-resolution IVUS transducers.

Main Methods:

  • Fabrication of focused ultrasonic transducers using the dimple technique with PMN-PT single crystal and lead-free KNN-KBT-Mn ceramic.
  • Characterization of transducer performance including center frequency, bandwidth, and insertion loss.
  • Evaluation of transducer imaging capabilities using a wire phantom and ex vivo vessel imaging.
  • Measurement of axial and lateral resolutions for both types of probes.

Main Results:

  • The lead-free KNN-KBT-Mn probe exhibited a center frequency of 40 MHz, 72% bandwidth, and 28.8 dB insertion loss.
  • The PMN-PT probe showed a center frequency of 34 MHz, 75% bandwidth, and 22.9 dB insertion loss.
  • The lead-free probe achieved superior -6 dB resolutions of 44 μm (axial) and 125 μm (lateral) compared to the PMN-PT probe (58 μm axial, 131 μm lateral).
  • Both probes successfully generated ultrasonic images of good resolution for phantoms and vessels.

Conclusions:

  • The mechanical dimpling technique is effective for fabricating high-frequency focused transducers.
  • Lead-free KNN-KBT-Mn ceramic probes demonstrate promising performance for intravascular ultrasound applications, particularly in achieving high axial resolution.
  • The developed probes show significant potential for enhanced diagnostic imaging in intravascular procedures.