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    • 2. 发明授权
    • Magnet apparatus and mri apparatus
    • 磁铁设备和仪器
    • US06853281B1
    • 2005-02-08
    • US09554155
    • 1998-12-01
    • Shigeru KakugawaShouji KitamuraNobuhiro HaraAkiyoshi KomuraNoriaki HinoHajime KawanoTakao HonmeiHirotaka TakeshimaTakeshi YatsuoHiroshi Tazaki
    • Shigeru KakugawaShouji KitamuraNobuhiro HaraAkiyoshi KomuraNoriaki HinoHajime KawanoTakao HonmeiHirotaka TakeshimaTakeshi YatsuoHiroshi Tazaki
    • G01R33/38G01R33/381G01R33/3815G01V3/00
    • G01R33/3806G01R33/381G01R33/3815
    • A magnet device includes two sets of static magnetic field generation sources spaced from each other in the vertical direction such that the uniform magnetic field region (patient space) is between then. Each set has concentric current carrying coils to generate a uniform magnetic field in a first direction (the vertical direction). Several such coils are used in each set, disposed such that when a first axis which is parallel to the first (vertical) direction and passes substantially through the centers of the current carrying coils crosses, at a first point, a second axis which is orthogonal to the first axis and is at substantially equal distance from the respective static magnetic field generation sources, the current carrying coils are disposed in such a manner that when geometrical centers of cross sections of the current carrying coils are projected on a first straight line that is in a first plane containing the first axis, the second axis and the first point and passing through the first point, the directions of the currents of the carrying coils at the respective corresponding projections align alternatively in positive and negative directions on the first straight line.
    • 磁体装置包括在垂直方向彼此间隔开的两组静态磁场产生源,使得均匀的磁场区域(患者空间)在之间。 每组具有同心的载流线圈,以在第一方向(垂直方向)上产生均匀的磁场。 在每组中使用若干这样的线圈,这样设置成使得当第一轴线平行于第一(垂直)方向并且基本上穿过载流线圈的中心穿过时,在第一点处与正交的第二轴线交叉 到第一轴线并且距离相应的静态磁场产生源基本上相等的距离,载流线圈以这样的方式设置,使得当载流线圈的横截面的几何中心投影在第一直线上时 在包含第一轴线,第二轴线和第一点并穿过第一点的第一平面中,各个相应突起处的输送线圈的电流方向在第一直线上在正向和负向上交替排列。