Automatic system for locating magnetic foreign bodies using GMI magnetometer

Abstract

The development of systems capable of characterizing the positioning and inclination of metallic objects inside the human body is seen with great interest by health professionals who are responsible for their extraction. A surgical procedure can be shortened from a few hours to minutes with a system that provides accurate positioning data. Thus, the present work aims at the construction of a measurement system of magnetic fields originated by ferromagnetic objects, based on magnetoimpedance (GMI) sensors. The developed system is capable of positioning a ferromagnetic object to be measured with 5 degrees of freedom, being 3 linear (X, Y, Z) and 2 angular (θ, Φ), and measure the magnetic flux density of this source in an automated way. Three tests were performed with a steel needle, varying the angles of inclination to the measurement plane (θ) and rotation angles in the same plane (Φ). The obtained results yieded records of the magnetic patterns formed by the needle, which can be later processed in order to create a localization software.

New measuring system for locating firearm projectiles in the human body based on eddy currents and GMI sensors

“…In a pursuit to develop biomedical techniques complying with these biometrological principles, recent studies have been carried out to develop low-cost, high-sensitivity magnetic transducers for safe and noninvasive measurements in humans, operating at room temperature, based on the Giant Magnetoimpedance (GMI) and Giant Magnetoresistance (GMR) effects to assist, among others, in performing foreign bodies location [5][6][7][8][9][10][11].…”

Convolutional Neural Network for non-invasive magnetic foreign body localization in the human body

“…Low-cost magnetic transducers to locate ferromagnetic objects in the human body, based on the Giant Magnetoimpedance (GMI) or Giant Magnetoresistance (GMR) effects, have been recently investigated [4][5][6][7]. These are initiatives to overcome the cost disadvantage of the non-invasive and innocuous technique when employing a superconducting sensor, thus allowing it to be better suited to comply with the Biometrology Principles recommended for incorporating the device in the healthcare sector [8].…”

Projeto De Sistema De Detecção De Corpos Estranhos Metálicos Não-Ferromagnéticos Baseado Em Eddy Currents E Magnetômetro Gmi

“…Mais recentemente, esforços vêm sendo realizados pela equipe do Laboratório de Biometrologia (LabBioMet) da PUC-Rio para o desenvolvimento de sistemas de medição de baixo custo, portáteis e que operem à temperatura ambiente para a detecção de corpos estranhos metálicos no corpo humano, baseados em transdutores GMR (Giant Magnetoresistance) e GMI (Giant Magnetoimpedance) para uso em larga escala pelos centros médicos [5][6][7][8][9][10].…”

“…Trabalhos e pesquisas realizadas no Laboratório de Biometrologia (LaBioMet) e no Laboratório de Pesquisa e Desenvolvimento em Eletrônica (LPDE) da PUC-Rio visam explorar as características de sensibilidade e resolução espacial de magnetômetros GMI, desenvolvendo instrumentos para aplicação nas áreas da biometrologia e biomedicina, como transdutores para medição de pressão arterial e localização de corpos estranhos metálicos ferromagnéticos e diamagnéticos, além de desenvolver um método automático para caracterizar a variação de módulo e fase de amostras GMI conforme os mais diversos parâmetros de influência [5][6][7][8][9][10][24][25][26].…”