Phase aberration correction in phased-array imaging systems

Details Phase aberration correction in phased-array imaging systems Phase aberration correction in phased-array imaging systems

1994-09-26

1996-01-30

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73602, 73626, 12866007, 12866101, G01N 2906, G01N 2910, G01N 2924

Patent

active

054873061

ABSTRACT:
An ultrasonic imaging system for performing a scan in which beamforming time delay errors due to nonuniformity in ultrasound propagation speed within the transmission medium are corrected. The system employs a multiple-channel transmitter and receiver. The method estimates and corrects phase aberrations in phased array imaging systems, taking into account additional information associated with array elements which are not necessarily adjacent to each other. The method uses Kalman filtering to obtain an estimate of the phase differences associated with complex samples of pairs of adjacent receive channels. The method incorporates a scheme to detect and correct for the 2.pi. phase slips that may occur in the data. Because the method provides information on measurement variances, better estimates are obtained by weighting the measurements according to their variances.

REFERENCES:
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patent: 5172343 (1992-12-01), O'Donnell
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patent: 5268876 (1993-12-01), Rachlin
patent: 5331964 (1994-07-01), Trahey et al.
patent: 5388461 (1995-02-01), Rigby
Flax et al., "Phase-Aberration Correction Using Signals from Point Reflectors and Diffuse Scatters: Basis Principles", IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, vol. 35, No. 6, Nov. 1988, pp. 758-767.

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