Document Detail

Simulation of B-scan images from two-dimensional transducer arrays: Part I--Methods and quantitative contrast measurements.
MedLine Citation:
PMID:  1296337     Owner:  NLM     Status:  MEDLINE    
Recently, theoretical investigations of the beamforming capability of two-dimensional (2-D) transducer arrays have characterized the array parameters required to steer a symmetrically focused ultrasound beam up to 45 degrees off-axis. These investigations have also shown that the number of elements in a steered 2-D array can be dramatically reduced by using a sparse set of elements, randomly distributed throughout the aperture of the transducer. 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. In this paper the potential of 2-D arrays for medical imaging is assessed by simulating B-scan images of spherical lesions, both cystic and scattering, embedded in a large random scattering volume. 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 is shown to perform at a reduced level, producing unacceptable artifactual echoes within images of cysts. The 8th order sparse array pattern has been fabricated on a fixed-focus poly(vinylidene difluoride) transducer using photolithographic techniques. Experimental images from this transducer are used to verify some of the theoretical predictions made in this paper. Comparisons between simulated B-scan images from linear and 2-D phased arrays are presented in a companion paper.
D H Turnbull; P K Lum; A T Kerr; F S Foster
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ultrasonic imaging     Volume:  14     ISSN:  0161-7346     ISO Abbreviation:  Ultrason Imaging     Publication Date:  1992 Oct 
Date Detail:
Created Date:  1993-04-16     Completed Date:  1993-04-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7909167     Medline TA:  Ultrason Imaging     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  323-43     Citation Subset:  IM    
Department of Medical Biophysics, University of Toronto, Ontario, Canada.
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MeSH Terms
Cysts / ultrasonography
Image Enhancement
Models, Structural
Technology, Radiologic
Ultrasonography / methods*

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