Patent ID: 9188652
Filing Date: 2015-11-17
Classification: G01R

Abstract:
1. A Magnetic Resonance Imaging apparatus, comprising: a 3D structure having a patient receiving cavity for receiving a body under examination; means for generating a static magnetic field in said patient receiving cavity, said means for generating the static magnetic field comprising at least a pair of permanent magnets spaced from each other so that the patient receiving cavity is interposed between said permanent magnets; means for generating variable magnetic fields in said patient receiving cavity; an antenna for transmitting electromagnetic nuclear spin excitation pulses; an antenna for receiving the electromagnetic signals generated by nuclear spin relaxation; at least one pole piece being mounted to the side of each permanent magnet facing towards the patient receiving cavity; and an end plate provided on the side of said pole piece facing towards the patient receiving cavity; a plate provided for at least one of said pole pieces, in superimposed relation thereto, for locating and fixing magnetic dipoles for fine correction of magnetic field homogeneity, for the purposes of shimming; a compartment formed between the end plate and said pole piece for receiving the magnetic correction dipole locating and fixing plate, with one or more of said magnetic correction dipoles mounted thereto; said compartment being openable at the raised peripheral edge of the pole piece by the provision of an opening of such a width and height as to form a slot for insertion and removal of said magnetic correction dipole locating and fixing plate with one or more magnetic correction dipoles mounted thereto, said slot being provided underneath said antenna and said end plate, which remain in place during insertion and removal of the magnetic correction dipole and fixing plate.