Back to results
US 5,309,103 AGranted
Apparatus to excite and/or to detect magnetic resonance
AssigneeBruker Medizintechnik GmbH
InventorHelmut Friedburg
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeBruker Medizintechnik GmbH
InventorHelmut Friedburg
Estimating the term…
An apparatus serves to excite and/or measure magnetic resonance in samples, in particular in relation to whole body tomography. A probehead (10) incorporates a high frequency system to transmit and/or to detect a high frequency magnetic field of a predetermined measuring frequency. The probehead (10) further incorporates a coil system to produce a magnetic field of predetermined inhomogeneity inside an inner space (13) of the probehead (10) varying according to a predetermined time program. Elements of the high frequency system are combined with elements of the coil system into common construction units. In addition, a signal processing unit for measured resonance signals is provided for. The construction units are in the form of hollow bodies (20). Coils (33) of the coil system are located inside the hollow bodies (20). Conductive outer walls (21) of the hollow bodies (20) form the high frequency system. The walls (21) exhibit a thickness (d) which is greater than the penetration depth of the measuring frequency but small enough to damp eddy currents in the wall (21) produced by the time-varying inhomogeneous magnetic field to such an extent that the time-variant inhomogeneous magnetic field essentially can penetrate the wall (21).
Apparatus to excite and detect magnetic resonance, the apparatus having a hollow probehead with an interior space and employing high frequency system elements to create and detect a high frequency magnetic field of a predetermined frequency in the interior space as well as gradient coils to create a magnetic field of predetermined inhomogeneity in the interior space and in which the high frequency system elements are combined with the gradient coils to form an integrated structure, characterized in that the integrated structure comprises a plurality of hollow tubular elements, each of the plurality of tubular elements having conductive walls, the tubular elements containing the gradient coils and the conductive walls forming the high frequency system elements.
Apparatus to excite and detect magnetic resonance, the apparatus having a hollow probehead with an interior space and employing high frequency system elements to create and detect a high frequency magnetic field of a predetermined frequency in the interior space as well as gradient coils to create a time-variant magnetic field of predetermined inhomogeneity in the interior space and in which the high frequency system elements are combined with the gradient coils to form an integrated structure, characterized in that the integrated structure comprises a plurality of hollow tubular elements, each of the plurality of tubular elements having conductive walls, the tubular elements containing the gradient coils and in that the conductive walls form the high frequency system elements and have a thickness which is greater than the penetration depth of the high frequency magnetic field and is sufficiently small that eddy currents created in the conductive walls by the time-variant magnetic field are damped to such an extent that the time-variant magnetic field essentially penetrated the conductive walls.
Apparatus to excite and detect magnetic resonance inside an MRI tomograph, the apparatus having a hollow probehead with an interior space and employing high frequency system elements to create and detect a high frequency magnetic field of a predetermined frequency in the interior space as well as gradient coils to create a time-variant magnetic field of predetermined spatial inhomogeneity in the interior space, the time-variant magnetic field varying according to a predetermined time-sequence, in which the high frequency system elements are combined with the gradient coils to form an integrated structure, the apparatus further having a signal processing unit for processing measured resonance signals characterized in that the integrated structure comprises a plurality of hollow tubular elements having electrically conducting outer walls and containing the gradient coils and that the electrically conducting outer walls form the high frequency system elements and have a thickness which is greater than the penetration depth of the high frequency magnetic field and is sufficiently small that eddy currents created in the conductive walls by the time-variant magnetic field are damped to such an extent that the time-variant magnetic field essentially penetrates the conductive walls.
Dependencies are inferred from the claim text.