RF shield for MRI comprising conductive coating as shielding material

摘要

The invention relates to a magnetic resonance imaging system (1) comprising: a main magnet (2) for generating a uniform, steady magnetic field within an examination volume, at least one RF antenna (9) for transmitting RF pulses to the examination volume for magnetic resonance spin excitation, a gradient coil unit comprising gradient coils (4, 5, 6) for generating gradient magnetic fields in the examination volume (100), an RF shield (104) disposed between said RF antenna (9) and said gradient coils (4, 5, 6), said RF shield (104) comprising a shielding material adapted for suppressing Eddy currents induced in the shield by said gradient magnetic fields and for screening RF fields towards the gradient coils (4, 5, 6), said RF fields being generated by the RF antenna (9), wherein the RF shield comprises a conductive coating (104, 110) as shielding material.

主权项

1. A magnetic resonance imaging system comprising:
a main magnet for generating a uniform, steady magnetic field within an examination volume, at least one RF antenna for transmitting RF pulses to the examination volume for magnetic resonance spin excitation, a gradient coil unit comprising gradient coils for generating gradient magnetic fields in the examination volume, an RF shield disposed between said RF antenna and said gradient coils, said RF shield comprising a shielding material adapted for suppressing eddy currents induced in the shield by said gradient magnetic fields and for screening RF fields towards the gradient coils, said RF fields being generated by the RF antenna, wherein the RF shield comprises a conductive coating as shielding material wherein the sheet resistance of the conductive coating is between 0.01 and 0.75 Ω/square/25 μm.