Needle artifacts caused by large magnetic susceptibility differences between metallic needles and stylets and the surrounding tissue are a persistent problem in interventional MRI. In this abstract, we present the concept, design and modeling results of a active shim system for needles inspired from degaussing coils used in naval vessels. Field disturbance induced by a Titanium needle at 3 Tesla is modeled and an active orthogonal shim coil insert design is presented to demonstrate shimming of the field variation around the needle. This work lays the foundation for designing full generalized active shim systems for Interventional MRI probes.
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