Magnetic resonance-compatible electrical device with radio frequency shielding or an enclosure
First Claim
Patent Images
1. An apparatus comprising:
- an electrical device or component including a circuit board with a ground plane; and
a radio frequency shield arranged to shield the electrical device or component, the radio frequency shield including at least the ground plane of the circuit board;
wherein the apparatus is configured to be disposed in the bore of a magnetic resonance scanner in a radio frequency field generated by the magnetic resonance scanner and in time-varying magnetic field gradients generated by the magnetic resonance scanner; and
wherein the ground plane of the circuit board includes an electrically conductive sheet or layer having openings sized to suppress time-varying magnetic field gradient-induced vibration of the radio frequency shield.
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Abstract
An apparatus comprises an electrical device or component (40) and a radio frequency shield arranged to shield the electrical device or component. The apparatus is disposed in a radio frequency (Bi) field generated by a magnetic resonance scanner and in time varying magnetic field gradients generated by the magnetic resonance scanner (10). The radio frequency shield includes an electrically conductive sheet or layer having openings suppressing time varying magnetic field gradient induced vibration of the radio frequency shield.
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Citations
22 Claims
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1. An apparatus comprising:
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an electrical device or component including a circuit board with a ground plane; and a radio frequency shield arranged to shield the electrical device or component, the radio frequency shield including at least the ground plane of the circuit board; wherein the apparatus is configured to be disposed in the bore of a magnetic resonance scanner in a radio frequency field generated by the magnetic resonance scanner and in time-varying magnetic field gradients generated by the magnetic resonance scanner; and wherein the ground plane of the circuit board includes an electrically conductive sheet or layer having openings sized to suppress time-varying magnetic field gradient-induced vibration of the radio frequency shield. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
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a circuit board with a ground plane; and an electrical device or component disposed on the circuit board and electrically interconnected by electrically conductive traces of the circuit board; wherein the ground plane of the circuit board comprises an electrically conductive sheet or layer having openings sized to suppress time-varying magnetic field gradient-induced vibration of the ground plane when the apparatus is disposed in a radio frequency field generated by a magnetic resonance scanner and in time-varying magnetic field gradients generated by the magnetic resonance scanner. - View Dependent Claims (15, 16, 17, 18, 21)
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19. An apparatus comprising:
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an electrical device or component; and an enclosure enclosing the electrical device or component; wherein the enclosure includes a plurality of parallel constituent electrically conductive sheets or layers spaced apart by one or more dielectric layers; and the constituent electrically conductive sheets or layers have openings sized to suppress time-varying magnetic field gradient-induced vibration of the enclosure when the apparatus is disposed in a radio frequency field generated by a magnetic resonance scanner and in time-varying magnetic field gradients generated by the magnetic resonance scanner. - View Dependent Claims (20)
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22. A magnetic resonance system comprising:
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a magnetic resonance scanner including a main magnet generating a static magnetic field in an examination region, magnetic field gradient windings for superimposing time-varying magnetic field gradients in selected directions within the examination region, and one or more radio frequency coils for generating a radio frequency field in the examination region; and an apparatus disposed in the radio frequency field generated by the magnetic resonance scanner and in the time-varying magnetic field gradients generated by the magnetic resonance scanner, the apparatus including (i) an electrical device or component including a circuit board with a ground plane and (ii) a radio frequency shield arranged to shield the electrical device or component, the radio frequency shield including at least the ground plane of the circuit board; wherein the apparatus is configured to be disposed in the bore of a magnetic resonance scanner in a radio frequency field generated by the magnetic resonance scanner and in time-varying magnetic field gradients generated by the magnetic resonance scanner; and wherein the ground plane of the circuit board includes an electrically conductive sheet or layer having openings sized to suppress time-varying magnetic field gradient-induced vibration of the radio frequency shield.
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Specification