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Timing-error-difference calibration of a two-dimensional array imaging system using the overlapping-subaperture

Yue Li1, Brent Robinson

  • 1Information and Communication Technologies Center, Commonwealth Scientific and Industrial Research Organisation, Marsfield, NSW 2122, Australia. yue.li@csiro.au

Ultrasonics
|September 6, 2012
PubMed
Summary
This summary is machine-generated.

This study calibrates imaging system timing errors using an overlapping-subaperture algorithm. Results show separate transmission and reception phase aberration measurements are unnecessary, simplifying calibration.

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Area of Science:

  • * Ultrasound imaging systems
  • * Electronic channel calibration
  • * Phase aberration correction

Background:

  • * Timing errors in transmitting and receiving channels of imaging systems create distinct phase-aberration profiles.
  • * Accurate calibration is crucial for high-resolution imaging.
  • * Previous work proposed an overlapping-subaperture algorithm to measure timing error differences.

Purpose of the Study:

  • * To evaluate the efficacy of the overlapping-subaperture algorithm for calibrating timing errors in a custom imaging system.
  • * To determine if separate measurement of transmission and reception phase-aberration profiles is required.
  • * To assess the feasibility of using a single derived profile for phase aberration correction.

Main Methods:

  • * Application of the overlapping-subaperture algorithm to a custom imaging system with a curved linear two-dimensional array.
  • * Measurement of the timing-error-difference profile between transmitting and receiving channels.
  • * Utilizing the near-field signal-redundancy algorithm to derive an average phase-aberration profile.

Main Results:

  • * The overlapping-subaperture algorithm successfully calibrated the timing-error-difference profile with a standard deviation of a few nanoseconds.
  • * The measured time-error-difference profile was less than one-tenth of a wavelength.
  • * Experimental data indicated no need for separate transmission and reception phase-aberration profile measurements.

Conclusions:

  • * The overlapping-subaperture algorithm provides accurate calibration of timing error differences in imaging systems.
  • * Separate measurement of transmission and reception phase aberrations is not necessary for this system.
  • * A single average phase-aberration profile can effectively correct for both transmission and reception phase aberrations.