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Advances in Acoustics and Vibration
Volume 2012 (2012), Article ID 275858, 6 pages
http://dx.doi.org/10.1155/2012/275858
Research Article

Transducer Field Imaging Using Acoustography

1Santec Systems, Inc., 2924 Malmo Drive, Arlington Heights, IL 60005, USA
2Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA

Received 23 December 2011; Accepted 29 March 2012

Academic Editor: Jafar Saniie

Copyright © 2012 Jaswinder S. Sandhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A common current practice for transducer field mapping is to scan, point-by-point, a hydrophone element in a 2D raster at various distances from the transducer radiating surface. This approach is tedious, requiring hours of scanning time to generate full cross-sectional and/or axial field distributions. Moreover, the lateral resolution of the field distribution image is dependent on the indexing steps between data points. Acoustography is an imaging process in which an acousto-optical (AO) area sensor is employed to record the intensity of an ultrasound wavefield on a two-dimensional plane. This paper reports on the application of acoustography as a simple but practical method for assessing transducer field characteristics. A case study performed on a commercial transducer is reported, where the radiated fields are imaged using acoustography and compared to the corresponding quantities that are predicted numerically.