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This study eliminates grating lobes in capacitive micromachined ultrasonic transducer (CMUT) arrays using periodic sparse array (PSA) pairs. Optimized PSA configurations reduce imaging artifacts, advancing CMUTs for 3D ultrasound.

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Area of Science:

  • Microelectromechanical Systems (MEMS)
  • Ultrasonic Transducer Technology
  • Medical Imaging

Background:

  • Capacitive micromachined ultrasonic transducers (CMUTs) offer high element density but increase hardware complexity.
  • Reducing active channels in CMUT arrays is crucial for practical applications.
  • Grating lobes are a common issue in periodic transducer arrays.

Purpose of the Study:

  • To investigate and mitigate grating lobes in CMUT periodic sparse array (PSA) pairs.
  • To reduce hardware complexity and imaging artifacts in CMUT-based systems.
  • To optimize PSA configurations for improved 3D ultrasound imaging.

Main Methods:

  • Designing active element positions for transmit and receive processes in CMUT PSA pairs.
  • Simulating effective aperture and beam patterns to analyze grating lobe generation.
  • Conducting experiments with a 256-element CMUT linear array for point target imaging.

Main Results:

  • Simulation results demonstrate the elimination of common grating lobes (CGLs) through optimized PSA design.
  • The study identified optimal sparse array configurations for a given sparse factor (SF).
  • Experimental validation confirmed the reduction of imaging artifacts with PSA pairs.

Conclusions:

  • Optimized CMUT PSA pairs effectively eliminate common grating lobes.
  • Selecting optimal sparse array configurations significantly reduces imaging artifacts.
  • This research is vital for the advancement of CMUTs in 3D ultrasound imaging.