Rf shielded room for nmr imaging system

Abstract

A radio-frequency shielded room for a nuclear magnetic resonance imaging system has at least one electrically-conductive shield wall substantially enclosing a predetermined volume adjacent to one end of the bore formed through an imaging magnet within which bore the imaging process is carried out. The at least one wall has an aperture therethrough substantially at and in registration with the one bore end. A hollow shield member, of an electrically-conductive material, extends through the magnet bore and has a first end region periphery aligned with and substantially electrically connected to the entire periphery of the aperture in the at least one wall. A second end of hollow shield member extends at least to the remaining end of the magnet bore, where it is enclosed with an electrically-conductive cap substantially electrically connected about the entire periphery of the hollow shield member second end. The at least one wall, the hollow shield member and the second end cap form a shielded room substantially completely enclosing the volume extending through the magnet bore and adjacent to one end thereof, which volume is effectively shielded from radio frequency signals emanating from outside the enclosed volume.