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1.发明公开
公开(公告)号：EP1281092A1
公开(公告)日：2003-02-05
申请号：EP01909991.0
申请日：2001-03-06
IPC分类号： G01R33/341 , G01R33/422 , G01R33/34
CPC分类号： G01R33/32 , G01R33/34015 , G01R33/34023 , G01R33/341
摘要： In magnetic resonance apparatus such as magnetic resonance imaging apparatus, wherein a receive coil (6) is placed adjacent to the surface of a patient (1), the coil (6) is spaced from the surface of the patient in the interests of improvement in signal-to-noise ratio with a pad (13), forming part of a structure with magnetic properties, of material having a permeability greater than that of free space at the frequency of magnetic resonance but being non-magnetic in steady magnetic fields interposed between the receive coil (6) and the surface of the patient (1), in order to guide flux from a signal source (12) in a region of interest (7) selectively along paths which couple with the receive coil (6) and therefore increase the strength of signal relative to the noise.
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公开(公告)号：EP1279203A2
公开(公告)日：2003-01-29
申请号：EP01908006.8
申请日：2001-03-06
CPC分类号： H01Q15/0013 , H01Q15/00 , H01Q15/002 , H01Q15/148
摘要： A structure (40) with switchable magnetic properties comprises: an array of capacitive elements (44) in which each capacitive element (44) includes a low resistance conducting path and is such that a magnetic component (H) of electromagnetic radiation (12) lying within a predetermined frequency band induces an electrical current (j) to flow around said path and through said associated element (44). The size of the elements (44) and their spacing (a) apart are selected such as to provide a predetermined permeability (ν) in response to said received electromagnetic radiation (12). Each capacitive element (44) comprises a plurality of stacked planar sections (42) each of which comprises at least two concentric spiral conducting members or tracks (46, 48) which are electrically insulated from each other. A switchable permittivity material, such as Barium Strontium Titanate (BST) is provided between the tracks. The magnetic properties of the structure are switched by applying a dc electrical potential between the conducting tracks.
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公开(公告)号：EP1281092B1
公开(公告)日：2007-03-07
申请号：EP01909991.0
申请日：2001-03-06
IPC分类号： G01R33/341 , G01R33/422 , G01R33/34
CPC分类号： G01R33/32 , G01R33/34015 , G01R33/34023 , G01R33/341
摘要： In magnetic resonance apparatus such as magnetic resonance imaging apparatus, wherein a receive coil (6) is placed adjacent to the surface of a patient (1), the coil (6) is spaced from the surface of the patient in the interests of improvement in signal-to-noise ratio with a pad (13), forming part of a structure with magnetic properties, of material having a permeability greater than that of free space at the frequency of magnetic resonance but being non-magnetic in steady magnetic fields interposed between the receive coil (6) and the surface of the patient (1), in order to guide flux from a signal source (12) in a region of interest (7) selectively along paths which couple with the receive coil (6) and therefore increase the strength of signal relative to the noise.
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公开(公告)号：EP1264368A1
公开(公告)日：2002-12-11
申请号：EP01908011.8
申请日：2001-03-06
CPC分类号： H05K9/0075 , H01Q17/00
摘要： Microstructured materials which can be tuned to a particular range of r.f. frequencies to display particular magnetic permeabilities have been proposed. A typical material is made of an array of capacitive elements e.g. spirals or rolls of conducting material on a non-conducting substrate. These materials can be used as screening material which is effective for the particular band of frequencies to which it is tuned. In one example, the rolls 2 to 5 are orientated normal to the face of the screen 1, which reflects or absorbs the magnetic vector of electromagnetic radiation impinging normal onto the reflector face.
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