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Development of a 2.25MHz flexible array ultrasonic transducer

Development of a 2.25MHz flexible array ultrasonic transducer Purpose This paper presents an ultrasonic flexible linear array transducer prototype developed to be coupled directly over human body curvatures. Methods The transducer was made of a 2.25 MHz piezoelectric ceramic array and a curvature sensor, both encapsulated by a flexible passive rubber. The curvature sensor was built with strain gauges. A focal time-delay law was applied by using the positional information of each element of the array. In this way, beam distortions can be avoided, and the sensitivity of the transducer can be enhanced to improve images. A phantom of a fractured cortical bovine bone was constructed. Results The phantom was used to validate the transducer. The curvature sensor of the transducer was able to measure an unknown curvature to identify the correct position of the piezoelectric elements of the array. Conclusion The ultrasound images demonstrate that the transducer, once coupled to a curved surface, is able to detect and locate discontinuities of approximately 0.5–2mm. . . . Keywords Flexible ultrasound transducer Phased linear array Ultrasound imaging Curvature sensor Introduction surfaces. To overcome this limitation, a flexible probe at- tached over the body may improve ultrasound image resolu- Ultrasound imaging has been reported as a well-established tion to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Biomedical Engineering Springer Journals

Development of a 2.25MHz flexible array ultrasonic transducer

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Publisher
Springer Journals
Copyright
Copyright © 2019 by Sociedade Brasileira de Engenharia Biomedica
Subject
Engineering; Biomedical Engineering and Bioengineering; Biomaterials; Biomedical Engineering/Biotechnology
ISSN
2446-4732
eISSN
2446-4740
DOI
10.1007/s42600-019-00006-1
Publisher site
See Article on Publisher Site

Abstract

Purpose This paper presents an ultrasonic flexible linear array transducer prototype developed to be coupled directly over human body curvatures. Methods The transducer was made of a 2.25 MHz piezoelectric ceramic array and a curvature sensor, both encapsulated by a flexible passive rubber. The curvature sensor was built with strain gauges. A focal time-delay law was applied by using the positional information of each element of the array. In this way, beam distortions can be avoided, and the sensitivity of the transducer can be enhanced to improve images. A phantom of a fractured cortical bovine bone was constructed. Results The phantom was used to validate the transducer. The curvature sensor of the transducer was able to measure an unknown curvature to identify the correct position of the piezoelectric elements of the array. Conclusion The ultrasound images demonstrate that the transducer, once coupled to a curved surface, is able to detect and locate discontinuities of approximately 0.5–2mm. . . . Keywords Flexible ultrasound transducer Phased linear array Ultrasound imaging Curvature sensor Introduction surfaces. To overcome this limitation, a flexible probe at- tached over the body may improve ultrasound image resolu- Ultrasound imaging has been reported as a well-established tion to

Journal

Research on Biomedical Engineering – Springer Journals

Published: Mar 19, 2019

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