Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Manufacturing of multi-element piezoelectric transducer to use in ultrasound elastography
Submission Author:
Breno Coelho , SP , Brazil
Co-Authors:
Breno Coelho, Chi Nan Pai
Presenter: Breno Coelho
doi://10.26678/ABCM.COBEM2017.COB17-2924
Abstract
Ultrasound elastography is a new imaging technique to measure the tissue elasticity. In this technique, an external mechanical excitation source is used to generate the vibration of the target, while an imaging transducer is used to track the shear waves speed to estimate the elasticity. The objective of this work is to develop an ultrasound transducer to be used as the excitation source. An ultrasonic transducer with 64 elements was built by using 5 MHz piezoelectric ceramic. A multi-element transducer was chosen to concentrate the mechanical energy at one point, avoiding the undesired effects on the adjacent tissues. Five different samples of mixture of epoxy and tungsten powder was tested to choose the best attenuation layer on the back side of the ceramic. A layer of epoxy and alumina was placed on the front side for better transmission of the mechanical wave. The transducer housing and fabrication jigs were designed and fabricated by using 3D printer to decrease the prototyping time. As a result, the proportion of 30% in mass of tungsten powder was chosen because of its good acoustic impedance (3.47 MRayls) and acceptable attenuation (18.10 dB/cm) properties. Each of the 64 elements showed adequate signal transmission. Our next step would be applying the ultrasound wave focus technique and higher power to generate the vibration of the target in a phantom
Keywords
Ultrasonics, Imaging, Medical, Ceramics
