Patent ID: 6747455
Filing Date: 2004-06-08
Classification: G01R

Abstract:
A method for influencing a homogeneous static magnetic field B0 in a direction of a z axis in a nuclear magnetic resonance (NMR) apparatus to reduce disturbances caused by superconducting components of a radio frequency (RF) coil for the reception of NMR signals from a sample in a measuring volume of the NMR apparatus, wherein superconducting components of the RF coil extend beyond an RF active region of the sample in the z direction, the disturbances concerning a z component of the B0 field in the RF active region of the sample, the method comprising the step of:exposing the superconducting components of said RF coil to an additional magnetic field of sufficient strength that all superconducting structures in the superconducting components of said RF coil which are disposed in the vicinity of the RF active region of the sample are maximally magnetized during application of this additional magnetic field such that their magnetization along the z axis which is transverse to B0 assumes a value which is substantially constant and not equal to zero.