DocumentCode :
1303337
Title :
Broad-bandwidth radiation patterns of sparse two-dimensional vernier arrays
Author :
Brunke, Shelby S. ; Lockwood, Geoffrey R.
Author_Institution :
Dept. of Biomed. Eng., Cleveland Clinic Found., OH, USA
Volume :
44
Issue :
5
fYear :
1997
Firstpage :
1101
Lastpage :
1109
Abstract :
The fabrication of a dense (one-half wavelength element spacing) two-dimensional (2D) transducer array suitable for medical ultrasound imaging is unrealistic using existing technology. Consequently, there is interest in developing sparse 2D transducer arrays. In this paper, we present the results of a study looking at the broad-bandwidth radiation patterns of 72 different sparse 2D vernier arrays. Suppression of grating lobes is achieved by choosing a different arrangement of transmit and receive elements using an analogy with a vernier scale. The broad-bandwidth radiation patterns were investigated by simulating volumetric sector scan of a point target. We summarize these results by deriving a set of design curves that predicts the minimum number of elements, element spacing, and apodization required for a desired beam width and maximum secondary lobe. The results show that a sparse vernier array can be designed with significantly lower average and peak secondary lobes compared with a sparse random array with the same number of elements and aperture size.
Keywords :
ultrasonic transducer arrays; 2D transducer array; apodization; broad-bandwidth radiation pattern; design; grating lobe; medical ultrasound imaging; point target; sparse two-dimensional vernier array; volumetric sector scan; Acoustic beams; Apertures; Biomedical imaging; Biomedical transducers; Focusing; Gratings; Phased arrays; Ultrasonic imaging; Ultrasonic transducer arrays; Ultrasonic transducers;
fLanguage :
English
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-3010
Type :
jour
DOI :
10.1109/58.655635
Filename :
655635
Link To Document :
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