Patent ID: 7772503

Claim:
An MRI apparatus comprising a removable electromagnetic shielding device, said MRI apparatus having a magnetic structure defining a detection cavity with at least one opening for introducing at least a part of a body under examination, said magnetic structure being for generating a static magnetic field, said cavity being surrounded by an electromagnetic shielding element having an opening coinciding with said at least one opening of the cavity, said electromagnetic shielding element being provided with a fastener for removably attaching and electrically connecting said electromagnetic shielding element to said removable electromagnetic shielding device, said fastener surrounding said opening of the cavity; said electromagnetic shielding element being electrically connected to ground; said removable electromagnetic shielding device being provided at said at least one opening of the cavity and being at least electrically connected to said electromagnetic shielding element at the opening of said shielding element; said removable electromagnetic shielding device being a flexible tubular sleeve having a cylindrical and/or in a truncated cone shape, and having at least one passage opening for the body part; said removable electromagnetic shielding device comprising means for fastening or compressing said at least one passage opening to the body part with a predetermined force against the body part in such a way as to close said at least one opening of the cavity and to generate a low-impedance electrical contact between the body part and said removable electromagnetic shielding device in order to prevent or reduce the infiltration of electromagnetic noise from outside to inside said cavity; said removable electromagnetic shielding device being made of a first inner conductive material layer and an outer insulating fabric layer; and said removable eletromagnetic shielding device further comprising at least one additional inner electrically conductive material layer overlapping and electrically connected to the first inner electrically conductive material layer; wherein said means for fastening or compressing comprise a fastening belt adapted to fasten an innermost conductive material layer of the removable electromagnetic shielding device against skin of the body part, thereby generating a large contacting surface between the body part and said innermost conductive material layer.