Patent ID: 7158000
Filing Date: 2007-01-02
Classification: G01R

Abstract:
1. A magnet structure for Nuclear Magnetic Resonance imaging apparatus, comprising: at least two opposing magnetic pole pieces located at a certain distance from each other and which delimit an imaging region; wherein the pole pieces are formed by at least one massive layer of a magnetically permeable material, and at least one layer of magnetically permeable material comprising a pack of superimposed sheets or foils, electrically insulated from each other, each sheet having cuts arranged over the surface of the sheet in positions that are at least partly non coincident with the cuts of at least one, or both adjacent sheets, and wherein each of the magnetically permeable sheets or foils comprises: a first face; and a second face; and wherein the cuts arranged over the surface of the sheet or foil have a width and length and are so arranged on each sheet, that the cuts of a sheet or foil are offset and not coincident with respect to the cuts of an adjacent sheet or foil, when the adjacent sheet is laid over the previous sheet in an overturned position, with the first face turned toward the first face of the first sheet or with the second face of said adjacent sheet turned toward the second face of the first sheet, regardless of the relative angular orientation of the sheets with respect to each other.