Transducer arrays used routinely for medical imaging generate diffracting finite amplitude ultrasonic fields that are typically asymmetric and intricate. The goal of this work is to validate a Burgers equation enhanced, nonlinear angular spectrum simulation approach with experimental measurements of an asymmetric finite amplitude ultrasonic field. A one‐dimensional transducer array with a 3:2 aspect ratio, separate azimuth and elevation foci, and a nonuniform aperture apodization was immersed in a watertank and was driven by a broadband pulse. A 0.6‐mm‐diam hydrophone receiver was mechanically scanned to obtain detailed maps of the harmonic content and spatial distribution of the finite amplitude ultrasonic field in nine transverse (00 to 160 mm, evenly spaced) and two orthogonal meridian plane cross sections. The fundamenal (2.3 MHz) component of the field, measured at face of the source, served as input for the numerical simulation (written in MATLAB and run on a notebook computer). Comparisons were performed at the fundamental, second, third, fourth, and fifth harmonics. Overall, excellent agreement was observed between experimental measurements of the nonlinear ultrasonic field generated with an asymmetric array transducer and the Burgers equation enhanced, nonlinear angular spectrum simulations. [Work supported by NIH R01 HL72761.]
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May 2004
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May 01 2004
Measurements and simulations of an asymmetric finite amplitude ultrasonic field
Kirk D. Wallace;
Kirk D. Wallace
Dept. of Phys., Washington Univ. in St. Louis, 1 Brookings Dr., Campus Box 1105, St. Louis, MO 63130
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Mark R. Holland;
Mark R. Holland
Dept. of Phys., Washington Univ. in St. Louis, 1 Brookings Dr., Campus Box 1105, St. Louis, MO 63130
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James G. Miller
James G. Miller
Dept. of Phys., Washington Univ. in St. Louis, 1 Brookings Dr., Campus Box 1105, St. Louis, MO 63130
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J. Acoust. Soc. Am. 115, 2594 (2004)
Citation
Kirk D. Wallace, Mark R. Holland, James G. Miller; Measurements and simulations of an asymmetric finite amplitude ultrasonic field. J. Acoust. Soc. Am. 1 May 2004; 115 (5_Supplement): 2594. https://doi.org/10.1121/1.4784460
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