Magnetic resonance tonography system with non-uniform basic field magnet
AssigneeSiemens Aktiengesellschaft
InventorOliver Heid
Life of this patent
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Abstract
A magnetic resonance tomography system has gradient coils arranged in a basic field magnet, an RF transmission and reception coil as well as a drive and evaluation circuit, and the basic field magnet is designed exclusively without taking the field homogeneity into consideration, so that it produces a basic magnetic field having a field gradient dB0z/du in the direction u in the scan volume that is smaller in the slice-selection direction and in the readout direction than a field gradient Gu activated in the respective direction u with the respective gradient coils.
Claims6
A magnetic resonance tomography system comprising a basic field magnet that generates a basic magnetic field B0 having a principal component B0z in a z-direction of a rectangular coordinate system, gradient coils in the basic field magnet which generate time-varying field gradients Gu in a direction u, an RF transmission and reception coil, and a drive and evaluation circuit for operating said basic field magnet, said gradient coils and said RF transmission and reception coil to excite nuclear spins in a selection direction in a scan volume and to read out and evaluate a magnetic resonance signal, arising from said nuclear spins, in a readout direction, said basic field magnet being designed independently of an absolute homogeneity of said basic magnetic field, to produce said basic magnetic field with a field gradient dB0z/du in the a scan volume that is lower in the selection direction and in the readout direction than the field gradient Gu activated in these respective directions with the gradient coils.
Dependencies are inferred from the claim text.