Modelling and Numerical Simulations of In-Air Reverberation Images for Fault Detection in Medical Ultrasonic Transducers: A Feasibility StudyReportar como inadecuado




Modelling and Numerical Simulations of In-Air Reverberation Images for Fault Detection in Medical Ultrasonic Transducers: A Feasibility Study - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Journal of Sensors - Volume 2015 2015, Article ID 796439, 14 pages -

Research Article

Department of Robotics and Mechatronics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland

Department of Mechanical Engineering, Sheffield University, Sheffield S1 3JD, UK

Department of Medical Physics, Sheffield Teaching Hospital NHS Foundation Trust, Royal Hallamshire Hospital, Glossop Road, Sheffield S10 2JP, UK

Received 7 November 2014; Revised 26 January 2015; Accepted 17 February 2015

Academic Editor: Xinyong Dong

Copyright © 2015 W. Kochański 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 simplified two-dimensional finite element model which simulates the in-air reverberation image produced by medical ultrasonic transducers has been developed. The model simulates a linear array consisting of 128 PZT-5A crystals, a tungsten-epoxy backing layer, an Araldite matching layer, and a Perspex lens layer. The thickness of the crystal layer is chosen to simulate pulses centered at 4 MHz. The model is used to investigate whether changes in the electromechanical properties of the individual transducer layers backing layer, crystal layer, matching layer, and lens layer have an effect on the simulated in-air reverberation image generated. Changes in the electromechanical properties are designed to simulate typical medical transducer faults such as crystal drop-out, lens delamination, and deterioration in piezoelectric efficiency. The simulations demonstrate that fault-related changes in transducer behaviour can be observed in the simulated in-air reverberation image pattern. This exploratory approach may help to provide insight into deterioration in transducer performance and help with early detection of faults.





Autor: W. Kochański, M. Boeff, Z. Hashemiyan, W. J. Staszewski, and P. K. Verma

Fuente: https://www.hindawi.com/



DESCARGAR PDF




Documentos relacionados