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Synthetic aperture imaging in medical ultrasound with correction for motion artifacts

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2 Author(s)
L. F. Nock ; Dept. of Biomed. Eng., Duke Univ., Durham, NC, USA ; G. E. Trahey

The authors state that a synthetic receive aperture (SRA) system of a relatively simple design could increase the resolution of a phased-array imaging system several-fold, by utilizing a given number of parallel receive channels to address a larger number of transducer elements through multiplexers. A 1×N phased array can be extended linearly to improve lateral resolution, or it can be split into an M×N array in order to improve resolution in the elevation dimension. Images from an SRA system are degraded by any tissue/transducer motion during data acquisition. This degradation can be corrected by estimating the axial component of the motion and then realigning the data. A cross-correlation technique, which detects the phase difference between two similar lines of RF data (one for each receive subaperture), is used to perform this correction. The results of a theoretical analysis, of simulations, and of laboratory experiments are presented to demonstrate the advantages of using SRA compared to using conventional phased-array imaging

Published in:

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Date of Conference:

4-7 Dec 1990