Numerical and experimental analysis of a wire meidum collimator for MRI

This paper analyses the collimation behavior of a wire medium devoted to magnetic resonance imaging. In a rst part, the point spread function of a doubly innite wire medium is analyzed for the magnetic eld with the help of the Array Scanning Method. In a second part, we present two methods to evaluate the eld transmission by the wire medium, based on the measure of the magnetic eld computed with the Method of Moments. Simulation results obtained with the Method of Moments are shown. This behavior is validated, in a third part, with experimental results obtained with Magnetic Resonance Imaging (MRI) instrument at the University Hospital of Liege with a straight-wires collimator. Both simulation and experimental results conrm the ability of the wire medium to transfer EM elds in MRI operational conditions.