Patent ID: 8536870
Filing Date: 2013-09-17
Classification: G01R

Abstract:
1. A portable in-bore shim coil insert suitable for correcting high-degree and high-order magnetic field inhomogeneities over a limited examination zone in a magnetic resonance assembly operating at about 3 T-12 T magnetic field strengths and for producing a more homogenous main magnetic (B 0 ) field within the limited examination zone for examination of a targeted Region Of Interest in a chosen subject, wherein the magnetic resonance assembly includes at least a MRI magnet having an internal bore of known configuration and volume, at least one set of gradient coils, and an arrangement of radio frequency coils, said portable in-bore shim coil insert comprising: a movable at will cylinder-like chamber which at least one shim coil array disposed upon an encompassing wall surface of said cylinder-like chamber, wherein said shim coil array comprises a plurality of surface coils which (α) are disposed in azimuthal symmetry and axial distribution upon a perimeter wall surface and (β) are able to provide multiple supplementary magnetic field gradients on-demand sufficient to cancel substantially at least some high order, high degree inhomogeneities of the B an electrical power supply in communication with said shim coil array; and means for securing said cylinder-like chamber at a selected location within the bore volume of a MRI magnet in the magnetic resonance assembly.