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Proceedings Paper

Image formation and restoration using multi-element synthetic array processing
Author(s): Jeremy A. Johnson; Mustafa Karaman; Butrus T. Khuri-Yakub
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Paper Abstract

Traditionally, the number of transmit and receive processing channels is equal to the number of transducers (N) in an ultrasound imaging system. Certain applications limit the number of processing channels such that there are fewer channels than transducer elements. For these cases, a subset of M adjacent transducers-a multi-element subarray-performs echo transmission and reception. The processing channels are multiplexed across the array as beams are acquired from each of K subarrays. Combination of all subarray apertures creates a multi-element synthetic aperture (MSA) that represents the response of the entire system. Appropriate 1D filtering is applied in the spatial domain to restore a response approximating that of full phased array imaging. Compared to full phased array (FPA) imaging, MSA imaging reduces the number of front-end processing channels by a factor of N/M. Three variations of the method were simulated for a 128-element array using 32-element subarrays. The effects of the signal bandwidth, subsampling rate, and filter length on the reconstructed 2D point-spread functions are shown. The method closely approximates the performance of FPA imaging with fewer processing channels.

Paper Details

Date Published: 11 April 2002
PDF: 10 pages
Proc. SPIE 4687, Medical Imaging 2002: Ultrasonic Imaging and Signal Processing, (11 April 2002); doi: 10.1117/12.462179
Show Author Affiliations
Jeremy A. Johnson, Stanford Univ. (United States)
Mustafa Karaman, Stanford Univ. (United States)
Butrus T. Khuri-Yakub, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 4687:
Medical Imaging 2002: Ultrasonic Imaging and Signal Processing
Michael F. Insana; William F. Walker, Editor(s)

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