Fast Characterization of Higher-Order Shim Dynamics By Impulse Response Measurements with a Dynamic Field Camera

Johanna Vannesj¹, Ariane Fillmer¹, Christoph Barmet¹, Peter Boesiger¹, Anke Henning¹, Klaas Paul Pruessmann¹

With the use of dynamic shimming higher demands are put on shim systems, regarding switching speed and dynamic characteristics. This calls for a fast and reliable method to comprehensively characterize the dynamic properties of the shims. Here we have investigated the use of shim impulse response functions (SIRF), as probed with a suitable set of input pulses and measurements of the field responses with a dynamic field camera. It was shown that the SIRF measurements could reveal different dynamic features of the shims, which may prove useful for system diagnostics and pre-emphasis setting.