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US 6,747,455 B2Granted
Magnetic homogenization of superconducitng RF coils for the reception of NMR signals
AssigneeBruker BioSpinAG
InventorDaniel Marek
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AssigneeBruker BioSpinAG
InventorDaniel Marek
Estimating the term…
A method for influencing the homogeneous static magnetic field B0 in the direction of a z axis in an NMR apparatus with disturbances caused by superconducting components of RF coils for receiving NMR signals in a sample in a measuring volume of the NMR apparatus, wherein the superconducting components of the RF coils extend past the RF active region of the sample in the z direction, wherein the disturbances concern the z component of the B0 field in the RF active region of the sample, is characterized in that the superconducting components of the RF coils are exposed to an additional magnetic field which is sufficiently strong that, in the course of application, all superconducting structures disposed in the vicinity of the RF active region of the sample in the superconducting components of the RF coils are maximally magnetized and thereby their magnetization transverse to B0 along the z axis assumes a value which is substantially constant and different from zero. The invention also concerns an NMR resonator with at least one RF coil, wherein superconducting conductor structures of the NMR resonator are disposed at a radial separation from the measuring sample with the superconducting conductor structures extending beyond the RF active part of the measuring sample in the z direction. The NMR resonator is characterized in that, after application of an additional magnetic field which maximally magnetized all superconducting conductor structures, the superconducting conductor structures have a transverse magnetization with respect to the direction of B0 with a value other than zero and which is substantially constant along the z axis. This eliminates the NMR relevant field disturbances of the RF coil.
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:
A device 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 device comprising:
An NMR apparatus for investigation of a measuring sample in an investigational volume disposed about a coordinate origin (x,y,z=0) of the apparatus, the apparatus comprising:
Dependencies are inferred from the claim text.