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Acoustic field simulation method for arbitrarily shaped transducer with dynamically refined sub-elements.

Jiaying Xiao1, Mengdi Xiao1, Bo Wang2

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Summary
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A new method for simulating ultrasound transducer acoustic fields uses dynamically refined sub-elements, significantly reducing computational cost and sampling frequency requirements compared to traditional methods.

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Area of Science:

  • Ultrasound transducer design
  • Acoustic field simulation
  • Biomedical engineering

Background:

  • Accurate simulation of emitted acoustic fields is vital for ultrasound transducer design.
  • Spatial impulse response (SIR) and aperture discretization are established methods for analyzing complex transducer fields.

Purpose of the Study:

  • To introduce a novel, efficient method for simulating acoustic fields from complex ultrasound transducers.
  • To improve computational efficiency and reduce sampling frequency requirements in acoustic field simulations.

Main Methods:

  • Employs dynamically refined sub-elements (SE) for aperture discretization and SIR generation.
  • Approximates time-of-flight with a step function and estimates intersection areas for improved accuracy.
  • Convolves generated SIRs with excitation pulses to compute acoustic pressure (AP) signals.

Main Results:

  • The new method achieves comparable accuracy to conventional time tracing SE (TTSE) methods.
  • Requires a sampling frequency 16 times lower than TTSE, reducing computational cost by approximately one order of magnitude.
  • Validated on focusing transducer arrays and hollow structured point focusing transducers.

Conclusions:

  • A novel method for simulating acoustic fields from complex ultrasound transducers is presented.
  • Significantly reduces required sampling frequency, leading to substantial improvements in acoustic field calculation efficiency.
  • Offers a more efficient alternative for designing transducers with intricate geometries and apodization patterns.