Diseño del campo magnético para imágenes de resonancia magnética de campo bajo
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Urueña Martínez, Sandra Catalina
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Tipo de contenido
Trabajo de grado - Maestría
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EspañolFecha de publicación
2019
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La resonancia magnética es una técnica de imágenes diagnósticas que puede ofrecer información anatómica y funcional. Una forma de ampliar el horizonte de esta técnica es el aprovechamiento del campo magnético terrestre para el uso de la resonancia magnética de campos bajos. Con el fin de desarrollar un sistema combinado que use esta fuente de campo, se diseñó un montaje que incluye el equipo de resonancia magnética de campo terrestre Magritek Terranova y un arreglo de imanes permanentes de neodimio con remanencia medida de 0,88± 0,07 T. Se estudió el campo terrestre en la ubicación del montaje y se obtuvo el máximo en inclinación de 205±0,5°. El sistema fue simulado con métodos de elementos finitos encontrando una distribución apropiada de 24 imanes en 4 barras para su posterior construcción y evaluación, etapa en la cual fue posible obtener un campo magnético espacialmente homogéneo de 64,9±1,2 µT y con variaciones temporales debidas a las fluctuaciones del campo terrestre. En la evaluación se obtuvieron bajos niveles de ruido de 2,3 µV y mejorar la relación señal ruido.
Abstract: Magnetic resonance is a technique of diagnostic imaging that may give anatomical and functional information. One way to broaden the horizon of this procedure is by taking advantage of the earth magnetic field for the use of low field magnetic resonance. In order to develop a combined system that uses this field source an assembly was designed which includes the device Magritek Terranova and an arrangement of neodimium permanent magnets of measured 0,88± 0,07 T remanence. The earth field was studied at the location of the setup and the maximum value was found at an inclination of 205±0,5°. The system was simulated by using finite element methods where a 24 magnets in a 4 bar distribution was found to be appropriate for its subsequent construction and evaluation, stage in which it was possible to obtain a magnetic field spatially homogeneous of 64,9±1,2 µT with variations in time due to fluctuations of the earth field. At the assesment , it was additionally possible to reach low noise levels up to 2,3 µV and improve the signal-to-noise ratio.
Abstract: Magnetic resonance is a technique of diagnostic imaging that may give anatomical and functional information. One way to broaden the horizon of this procedure is by taking advantage of the earth magnetic field for the use of low field magnetic resonance. In order to develop a combined system that uses this field source an assembly was designed which includes the device Magritek Terranova and an arrangement of neodimium permanent magnets of measured 0,88± 0,07 T remanence. The earth field was studied at the location of the setup and the maximum value was found at an inclination of 205±0,5°. The system was simulated by using finite element methods where a 24 magnets in a 4 bar distribution was found to be appropriate for its subsequent construction and evaluation, stage in which it was possible to obtain a magnetic field spatially homogeneous of 64,9±1,2 µT with variations in time due to fluctuations of the earth field. At the assesment , it was additionally possible to reach low noise levels up to 2,3 µV and improve the signal-to-noise ratio.