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    • 2. 发明公开
    • Method and device for compensating for magnetic noise fields in spatial volumes, and nuclear magnetic resonance imaging apparatus.
    • 用于补偿空间体积中的磁噪声场的方法和设备以及核磁共振成像设备。
    • EP1353192A1
    • 2003-10-15
    • EP03100618.2
    • 2003-03-11
    • Esaote S.p.A.
    • Carlini, DavideCarrozzi, AlessandroGinanneschi, AldoIaia, Paolo
    • G01R33/389
    • A method for compensating for magnetic noise fields in spatial volumes, comprising the following steps: determining the strength of a magnetic field outside said spatial volume; defining, i.e. according to the laws of electromagnetism, the correlation between the noise field outside the spatial volume and the corresponding noise field inside said spatial volume, or calculating the noise field inside the spatial volume from the measurement/s of the magnetic field outside the spatial volume; from the inside magnetic field. The method further provides separate detection of noise fields with frequencies in the range of at least two different frequency bands and the generation of the corresponding compensation field for all noise fields with frequencies in the range of said at least two predetermined frequency bands.
      The invention also relates to a device for implementing said method and a Magnetic Resonance imaging apparatus, which integrates a device according to the invention.
    • 一种用于补偿空间体积中的磁噪声场的方法,包括以下步骤:确定所述空间体积之外的磁场强度; 根据电磁法则定义空间体积之外的噪声场与所述空间体积内相应的噪声场之间的相关性,或者根据所述空间体积之外的磁场的测量/ s来计算空间体积内的噪声场 空间体积; 来自内部磁场。 该方法还提供了具有在至少两个不同频带范围内的频率的噪声场的单独检测以及针对具有在所述至少两个预定频带范围内的频率的所有噪声场的对应补偿场的产生。 本发明还涉及一种用于实现所述方法的装置和一种集成了根据本发明的装置的磁共振成像设备。
    • 8. 发明公开
    • Magnet structure for nuclear magnetic resonance imaging apparatus
    • Struktur eines MagnetenfürKernspintomographen
    • EP1464977A1
    • 2004-10-06
    • EP04100369.0
    • 2004-02-02
    • Esaote S.p.A.
    • Trequattrini, AlessandroCarlini, DavidePittaluga, StefanoBesio, Stefano
    • G01R33/383
    • G01R33/383
    • A magnet structure for Nuclear Magnetic Resonance imaging apparatus, which magnet structure has at least two opposing magnetic pole pieces (1), which are located at a certain distance from each other and delimit an imaging region, which pole pieces (1) are formed by at least one massive layer (201) of a magnetically permeable material, and at least one layer of magnetically permeable material consisting of a pack of superimposed sheets (2,2') or foils, electrically insulated from each other, each of which sheets has cuts (102,102') arranged over the surface of the sheet (2,2') in positions that are non coincident with the cuts (102,102') of one or both adjacent sheets (2'). The magnetically permeable sheets or foils (2,2') have a first face and a second face and the cuts (102,102') have a width and a length and are arranged on each sheet (2,2'), that the cuts (102,102') of a sheet or foil (2) are offset and not coincident with respect to the cuts (102,102') of the adjacent sheet or foil (2'), when said adjacent sheet (2') is laid over the previous sheet (2) in an overturned position, i.e. with the first face turned toward the first face of the first sheet (2) or with the second face of said adjacent sheet (2') turned toward the second face of the first sheet (2).
    • 一种用于核磁共振成像装置的磁体结构,该磁体结构具有至少两个相对的磁极片(1),该至少两个相对的磁极片(1)彼此隔开一定距离并限定成像区域,该极片(1)由 至少一个可渗透材料的块状物层(201)和至少一层导磁材料层,由一叠重叠片材(2,2')或箔组成,彼此电绝缘,每片片材具有 在与一个或两个相邻的片材(2')的切口(102,102')不重合的位置处,在片材(2,2')的表面上布置的切口(102,102')。 导磁片或箔片(2,2')具有第一面和第二面,并且所述切口(102,102')具有宽度和长度并且布置在每个片材(2,2')上,所述切口 当相邻的片材(2')被放置在先前的片材(2')上时,片材或箔片(2)的切口(102,102')相对于相邻片材或箔片(2')的切口(102,102')不相重合, (2)处于翻转位置,即第一面朝向第一片(2)的第一面转动,或者相邻片(2')的第二面转向第一片(2)的第二面, 。