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Abstract #2824

Influence of Collimator Insertion on Eddy Currents for different Resistivities of Tungsten

Amine Samoudi 1 , Karen Van Audenhaege 2 , Gnter Vermeeren 1 , Michael Poole 3 , Roel Van Holen 2 , Luc Martens 1 , and Wout Joseph 1

1 INTEC, Ghent University/iMinds, Ghent, Belgium, 2 ELIS, Ghent University/iMinds, Ghent, Belgium, 3 INM-4, Forschungszentrum Jlich GmbH, Jlich, Germany

This study investigates eddy currents in the collimator due to gradient coils, for different resistivities of tungsten materiel. The system is meant to be used for a small animal SPECT/MRI. Two electromagnetic simulation platforms, SEMCAD-X and FEKO, were employed for simulating the gradient coils with the collimator. Results showed that for higher values of resistivity, lower current densities on the collimator are obtained and thus lower eddy current effects, reducing deviations from the expected values of the gradient. Characterizing eddy currents and using an improved design of the gradient should reduce the eddy current effect on the collimator.

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