Two-Dimensional Frequency Domain Phase Aberration Correction
Phase aberration due to tissues with inhomogeneous acoustic speeds is a major source of image degradation in medical ultrasound. In most phased array pulse-echo ultrasound systems, the delays used to focus and steer the beams are calculated assuming constant acoustic speed. However, it is known that the acoustic speed varies for different types of tissue, resulting in defocusing, loss of resolution, and blurring of the image. The issue of phase aberration measurement and correction has been the focus of several research groups in recent years1,2,3. Many of the existing techniques correct for aberration by estimating the phase error profile and using the estimate to align the rf signals.
KeywordsSpatial Frequency Temporal Frequency Ghost Image Medical Ultrasound Acoustic Speed
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- 1.M. O’Donnell, and S. W. Flax, “Phase aberration measurements in medical ultrasound: human studies,” Ultrasonic Imaging, 10(1):1–11 (1988).Google Scholar
- 6.W. T. Mayo and P. M. Embree, “Two dimensional processing of pulsed doppler signals,” U.S. Patent 4,930,513.Google Scholar
- 7.L. S. Wilson, “Description of broad-band pulsed doppler ultrasound processing using the two-dimensional fourier transform,” Ultrasonic Imaging, 13:301–315 (1991).Google Scholar
- 8.M. Allam and J. F. Greenleaf, “Phase aberration correction for ultrasound imaging in temporal-spatial frequency domain,” Proc. IEEE Int. Con. Acoust Speech and Sig. Proc, ICASSP-95, (1995).Google Scholar
- 9.M. Allam and J.F. Greenleaf, “Isomorphism between pulsed-wave doppler ultrasound and direction-of-arrival estimation-part I: basic principles,” submitted to IEEE Trans. UFFC, (in review).Google Scholar