Accurate modeling of electromagnetic effects on patients and objects is becoming increasingly important as higher magnetic field strengths are used in magnetic resonance systems. Numerical simulations have good result in this area, but their execution time make the exploration of the space of possibility extremely small. Exists anyway a study able to make rigorous and fast simulations using mode expansions with dyadic Green’s functions. This study had amazing result in the magnetic resonance systems coil design, and the tool to perform the simulations is widely used in this field of research. The aim of the work is analyzing the program distributed to the universities to perform simulation and presenting eventual enhancements. Is presented the program, with the theory behind it and the algorithms that implement this theory. Some modification are descripted explaining also which kind of enhancements they bring. Finally some experiments are performed to compare the two version reported in this work. What emerge from this work is that the original tool is too much specialized and not really user friendly, aspects solved by the second version. The performances anyway, even if them are enhanced by the revised code, have a gain not really meaningful, but still all considered the modification of the original offer a valid substitute.

La costruzione di modelli accurati degli effetti elettromagnetici sta diventando sempre più importante in quanto campi magnetici di forza sempre maggiore vengono utilizzati nei sistemi di risonanza magnetica. Simulazioni numeriche hanno ottenuto ottimi risultati nel campo ma il loro tempo di esecuione è troppo alto per esplorare un vasto spazio di soluzioni. Esistono tuttavia metodi veloci e rigorosi come quello teorizzato dal Professor Lattanzi che usa la dyadic Green's funcion e l'espansione modale. Con questo metodo si può effettuare un design delle coils seguendo il rapporto segnale rumore, per avere immagini di maggiore qualità.

Computing intrinsic signal to noise ratio using diadic Green's function for application on magnetic resonance imaging coil design

MARINELLI, MATTEO
2018/2019

Abstract

Accurate modeling of electromagnetic effects on patients and objects is becoming increasingly important as higher magnetic field strengths are used in magnetic resonance systems. Numerical simulations have good result in this area, but their execution time make the exploration of the space of possibility extremely small. Exists anyway a study able to make rigorous and fast simulations using mode expansions with dyadic Green’s functions. This study had amazing result in the magnetic resonance systems coil design, and the tool to perform the simulations is widely used in this field of research. The aim of the work is analyzing the program distributed to the universities to perform simulation and presenting eventual enhancements. Is presented the program, with the theory behind it and the algorithms that implement this theory. Some modification are descripted explaining also which kind of enhancements they bring. Finally some experiments are performed to compare the two version reported in this work. What emerge from this work is that the original tool is too much specialized and not really user friendly, aspects solved by the second version. The performances anyway, even if them are enhanced by the revised code, have a gain not really meaningful, but still all considered the modification of the original offer a valid substitute.
ING - Scuola di Ingegneria Industriale e dell'Informazione
25-lug-2019
2018/2019
La costruzione di modelli accurati degli effetti elettromagnetici sta diventando sempre più importante in quanto campi magnetici di forza sempre maggiore vengono utilizzati nei sistemi di risonanza magnetica. Simulazioni numeriche hanno ottenuto ottimi risultati nel campo ma il loro tempo di esecuione è troppo alto per esplorare un vasto spazio di soluzioni. Esistono tuttavia metodi veloci e rigorosi come quello teorizzato dal Professor Lattanzi che usa la dyadic Green's funcion e l'espansione modale. Con questo metodo si può effettuare un design delle coils seguendo il rapporto segnale rumore, per avere immagini di maggiore qualità.
Tesi di laurea Magistrale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10589/148523