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Diffuse ultrasound computed tomography.

Ines Elisa Ulrich1, Christian Boehm1, Andrea Zunino1

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This study introduces a novel method for acquiring ultrasonic travel time data, inspired by seismic interferometry. This approach enhances ultrasound computed tomography by reducing acquisition time and eliminating calibration needs.

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Area of Science:

  • Wave physics
  • Acoustics
  • Tomography

Background:

  • Ultrasound computed tomography (UCT) relies on accurate travel time data acquisition.
  • Current methods can be time-consuming and require extensive calibration.
  • Instrument noise can degrade the quality of UCT reconstructions.

Purpose of the Study:

  • To develop an alternative approach for acquiring transmission travel time data in UCT.
  • To shorten acquisition times for systems with numerous emitters.
  • To eliminate the need for calibration and suppress instrument noise.

Main Methods:

  • Exploiting device geometry common in medical imaging and non-destructive testing.
  • Applying seismic ambient field interferometry principles to diffuse ultrasonic wavefields.
  • Utilizing inter-station correlation of active ultrasonic sources to extract travel time information.
  • Employing phase-weighted stacking of correlograms for ensemble interferograms to reduce errors.

Main Results:

  • The proposed method allows for accurate travel time measurements.
  • Accuracy is assessed analytically and via spectral-element simulations.
  • Tomographic reconstructions are feasible with both straight- and bent-ray approaches.
  • Stochastic fluctuations are less impactful than regularization choices.

Conclusions:

  • This conceptual study presents a viable alternative for ultrasonic travel time data acquisition.
  • The method shows potential for improving UCT efficiency and accuracy.
  • Further implementation studies are warranted based on these findings.