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Image quality evaluation with a new phase rotation beamformer.

Anup Agarwal1, Fabio Kurt Schneider, Yang Mo Yoo

  • 1Departments of Electrical Engineering and Bioengineering, Image Computing Systems Laboratory, University of Washington, Seattle, WA, USA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 7, 2008
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Summary

A new phase rotation beamformer (TSD-AFOV-PRBF) significantly reduces computational cost for ultrasound imaging. This method achieves comparable image quality to conventional beamformers with fewer processing steps and beamforming points.

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Area of Science:

  • Medical imaging
  • Ultrasound technology
  • Digital signal processing

Background:

  • Dynamic focusing using digital receive beamforming (DRBF) enhances ultrasound image quality but is computationally intensive.
  • Conventional quadrature demodulation-based phase rotation beamformers (QD-PRBF) require numerous complex filters and beamforming points, increasing computational load.

Purpose of the Study:

  • To evaluate the image quality of a novel, computationally reduced phase rotation beamformer (TSD-AFOV-PRBF).
  • To compare the performance of the TSD-AFOV-PRBF against conventional QD-PRBF using phantom and in vivo data.

Main Methods:

  • Developed a novel beamformer integrating 2-stage demodulation (TSD) to reduce lowpass filters and adaptive field-of-view (AFOV) imaging to decrease beamforming points.
  • Dynamic focusing is performed on mixed signals in TSD, with beamforming frequency adjusted by FOV size in AFOV imaging.
  • Quantitative image quality assessment using phantom and in vivo data, measuring contrast resolution (CR) degradation.

Main Results:

  • The TSD-AFOV-PRBF achieved comparable image quality to QD-PRBF with significantly fewer beamforming points (1024).
  • Median CR degradation was 7.6% for a 160 mm FOV, improving to 2.3% for an 85 mm FOV.
  • Similar performance was observed in both phantom and in vivo studies.

Conclusions:

  • The TSD-AFOV-PRBF offers a computationally efficient alternative to conventional beamformers.
  • Comparable image quality is maintained at a considerably reduced computational cost.
  • This novel beamformer holds potential for improved ultrasound system performance.