RF magnetic shield for MRI
AssigneeKabushiki Kaisha Toshiba
InventorsYoshitomo Sakakura, Motoji Haragashira, Toru Segawa
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Abstract
Disclosed is an RF magnetic shield for magnetic resonance imaging apparatus having a gradient coil and an RF coil allocated in a generally cylindrical magnet of the apparatus. The RF magnetic shield comprises conductive shielding plate members, disposed between the gradient coil and the RF coil, through which long slits are formed, and capacitors connected to both the longitudinal ends of the slits, respectively. Each of the capacitors consists of a multilayer capacitor, which is a larger capacitance and is continuously and electrically connected to both the longitudinal ends of the respective slits.
Claims15
An RF magnetic shield for a magnetic resonance imaging apparatus having a gradient coil and an RF coil, the gradient coil and the RF coil each having a length direction and an axis along the length direction with the axis of the gradient coil and the RF coil coaxially aligned, the RF magnetic shield comprising:
- a cylindrically shaped conductive shielding sheet means, having an axis aligned with said axis of the gradient coil and the RF coil, and disposed, therebetween, said shielding sheet means having a slit having a length along said axis direction and a width, perpendicular to the length, with said length longer than said width;
- and
- a multilayer capacitor covering at least a part of the slit along the length of the RF coil and covering the slit along the width thereof and being connected to said shielding sheet means.
An RF magnetic shield for a magnetic resonance imaging apparatus having a gradient coil and an RF coil, the gradient coil and the RF coil each having a length direction and an axis along the length direction with the axis of the gradient coil and the RF coil coaxially aligned, the RF magnetic shield comprising:
- a plurality of laterally spaced apart single layer conductive shielding sheets formed in a substantially cylindrical shape having an axis aligned with said axis of the gradient coil and the RF coil and disposed therebetween, wherein two immediately adjacent laterally spaced apart shielding sheets define a slit therebetween, said slit having a length along said axis direction and a width, defined by the separation between said two sheets, with said length longer than said width;
- and
- a plurality of multilayer capacitors, each capacitor electrically connected to two adjacent shielding sheets positioned to cover the slit therebetween, along the width thereof, and along the length of the RF coil.
Dependencies are inferred from the claim text.