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Proceedings Paper

Two-dimensional transducer arrays for medical ultrasound: beamforming and imaging (Invited Paper)
Author(s): Daniel H. Turnbull; F. Stuart Foster
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Paper Abstract

Two-dimensional (2-D) transducer arrays offer the potential for improving medical ultrasound imaging by producing symmetrically focused ultrasound beams which can be steered throughout a three-dimensional volume. Theoretical investigations of the beamforming properties of 2-D arrays have characterized the array parameters required to steer the beam up to 45 degree(s) off-axis. These investigations have also shown that the number of elements in a steered 2-D array can be dramatically reduced using a sparse set of elements, randomly distributed throughout the transducer aperture. The penalty paid for the use of a sparse array is the development of a `pedestal' sidelobe in the beam profile, the amplitude of which increases as the number of elements in the array decreases. The potential of 2-D arrays for medical imaging has been assessed by simulating images of spherical lesions embedded in a random scattering medium. Similar contrast characteristics over a range of cyst sizes are demonstrated for a dense 2-D array and a sparse array with 1/8th the number of elements, both operating at 5 MHz. A 32nd order sparse array was found to perform at a reduced level, producing unacceptable artifactual echoes within images of cysts. Experimental results are described which verify some of the theoretical predictions.

Paper Details

Date Published: 5 November 1992
PDF: 14 pages
Proc. SPIE 1733, New Developments in Ultrasonic Transducers and Transducer Systems, (5 November 1992); doi: 10.1117/12.130598
Show Author Affiliations
Daniel H. Turnbull, Univ. of Toronto (Canada)
F. Stuart Foster, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 1733:
New Developments in Ultrasonic Transducers and Transducer Systems
Frederick L. Lizzi, Editor(s)

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