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Element Position Calibration for Matrix Array Transducers with Multiple Disjoint Piezoelectric Panels.

Jacob R McCall1,2, Arthur Chavignon3, Olivier Couture3

  • 1Department of Electrical Engineering, North Carolina State University, Raleigh, NC, USA.

Ultrasonic Imaging
|February 9, 2024
PubMed
Summary

Calibrating two-dimensional ultrasound transducer element positions improves image quality. This simple procedure minimizes image degradation and reduces artifacts, enhancing diagnostic information for advanced ultrasound methods.

Keywords:
3-D ultrasoundULMcalibrationtransducer

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • Two-dimensional ultrasound transducers offer volumetric data for enhanced clinical diagnostics.
  • Emerging ultrasound techniques like super-resolution and functional imaging rely on this technology.
  • Matrix probes with disjoint piezoelectric panels may require element position calibration due to fabrication complexity.

Purpose of the Study:

  • To detail two methods for calibrating the element positions of a 1024-channel 8 MHz matrix transducer.
  • To establish calibration as a necessary step for high-resolution B-mode imaging and advanced ultrasound methods.
  • To demonstrate the impact of calibration on image quality and artifact reduction.

Main Methods:

  • Two distinct calibration techniques were applied to the Vermon 1024-channel 8 MHz matrix transducer.
  • Element positions were precisely determined to correct for fabrication-induced misalignments.
  • The calibration procedure focused on optimizing transducer performance for image acquisition.

Main Results:

  • Calibration significantly improved the point spread function (PSF) shape.
  • PSF-doubling artifacts were reduced by up to 10 dB.
  • Transducer-based image degradation was minimized, leading to higher quality B-mode images.

Conclusions:

  • Element position calibration is essential for high-resolution ultrasound imaging.
  • This calibration enhances diagnostic information by reducing artifacts and improving image quality.
  • The presented methods offer a simple yet effective approach to optimize 2D matrix transducer performance for advanced applications.