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US 5,631,561 AGranted
Arrangement for measuring and controlling the basic field of an NMR tomography apparatus
AssigneeSiemens Aktiengesellschaft
InventorEckart Stetter
Life of this patent
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Abstract
For measuring the basic field, at least one magnetic field probe is attached in the examination region of the nuclear magnetic resonance tomography system. The influence of the magnetic field gradients on the measurement is eliminated by a correction stage for pulsed magnetic field gradients arising from the switched gradients.
Claims12
A nuclear magnetic resonance tomography apparatus comprising:
- a basic field magnet which generates a basic magnetic field in an examination region;
- a plurality of gradient coils and means for operating said gradient coils for producing switched magnetic field gradients in said examination region superimposed on said basic magnetic field;
- at least one magnetic field probe disposed in said examination region comprising an MR probe, said MR probe generating an output signal dependent on the magnetic field measured at the location of said MR probe;
- and
- correction means for correcting the influence of said switched gradients on said output signal for producing a measuring value representing the basic magnetic field without contributions of said switched gradients.
2 more elements
Dependencies are inferred from the claim text.