Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
TEST BENCH FOR THE DEVELOPMENT OF IMAGING RECONSTRUCTION ALGORITHMS OF THE ULTRASOUND TOMOGRAPHY
Submission Author:
Nilton Barbosa da Rosa Junior , SP
Co-Authors:
Nilton Barbosa da Rosa Junior, Chi Nan Pai
Presenter: Nilton Barbosa da Rosa Junior
doi://10.26678/ABCM.COBEM2019.COB2019-1186
Abstract
A real-time and continuous imaging method is important to monitor patients under mechanical ventilation in the intensive care unit. Conventional ultrasound imaging requires an operator to position the probe, while the Electrical Impedance Tomography presents low spatial resolution and low location accuracy. The Ultrasound Tomography (UST) has the potential to provide better pulmonary functional imaging. However, it has never been used before. The objective of this work is to develop an experimental test bench, to simulate a UST, to evaluate its feasibility for pulmonary functional imaging, and to develop imaging reconstruction algorithms. Eight mono-element transducers were manufactured by using 500 kHz piezoelectric ceramic and were characterized by measuring its electrical impedance and by using the pulse-echo technique. The transducers were assembled on a wooden cylinder that was placed inside a tank filled with water. One transducer was used as emitter and four others as receptors, with a phantom placed in several positions inside. The electrical impedance and the pulse-echo results showed frequencies below 200 kHz with amplitudes between 20 and 300 mV (peak-to-peak), adequate for lung imaging. The evaluation of the test bench also showed signals compatible with expected, showing the feasibility of the UST.
Keywords
Ultrasound Tomography, PZT Transducer, Lung Monitoring, Mechanical Ventilation
