Development of a 2.25 MHz flexible array ultrasonic transducer (Englisch)

In: Research on Biomedical Engineering   ;  35 ,  1  ;  27-37  ;  2019

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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 0.5–2 mm.

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