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    • 9. 发明授权
    • Scan room for magnetic resonance imager
    • 磁共振成像仪扫描室
    • US4651099A
    • 1987-03-17
    • US682423
    • 1984-12-17
    • Harold J. VinegarJefferson H. Taylor
    • Harold J. VinegarJefferson H. Taylor
    • G01R33/28G01R33/38G01R33/422G01R33/20
    • G01R33/422G01R33/28Y10S505/844
    • A scan room is disclosed in which a magnetic resonance (MR) imager can be located that will reduce to an acceptable level outside the room the strength of the fringe magnetic fields produced by the imager and that will shield the imager from magnetic, radio frequency electromagnetic, and electric fields outside the room, while allowing the magnet of the imager to be shimmed to produce a sufficient homogeneous field to obtain the desired images. The scan room is rectangular although it could be cylindrical or spherical. Its walls, floor, and ceiling are made of a plurality of steel plate welded together. The thickness of the walls can vary as the distance from the magnet and the permeability of the steel plates varies. A steel door allows patients and medical personnel to enter and leave the room.
    • 公开了一种扫描室,其中可以定位磁共振(MR)成像器,该磁共振(MR)成像器将在室外降低到成像器产生的边缘磁场的强度并且将屏蔽成像器免受磁,射频电磁 ,以及房间外的电场,同时允许成像器的磁体被垫片以产生足够的均匀场以获得期望的图像。 扫描室是矩形的,尽管它可以是圆柱形或球形。 其墙壁,地板和天花板由焊接在一起的多个钢板制成。 壁的厚度可以随着与磁体的距离和钢板的渗透性变化而变化。 钢门允许病人和医务人员进出房间。
    • 10. 发明授权
    • Methods for overcoming transient magnetic field inhomogeneity in nuclear
magnetic resonance imaging
    • 克服核磁共振成像瞬态磁场不均匀性的方法
    • US4647858A
    • 1987-03-03
    • US760222
    • 1985-07-29
    • Paul A. Bottomley
    • Paul A. Bottomley
    • G01R33/3875A61B5/055A61B10/00G01R33/385G01R33/54G01R33/565G01R33/20
    • G01R33/482G01R33/385G01R33/56518Y10S505/844
    • Methods for overcoming transient magnetic field gradient inhomogeneity in a nuclear magnetic resonance imaging and/or nuclear magnetic resonance spectroscopic imaging system, wherein the inhomogeneities are induced by the pulsed magnetic field gradients utilized in the imaging process itself, provide at least one correction pulse signal during, or after, any application of the desired magnetic field to the sample-to-be-investigated in the system. At least one of the pulse signal characteristics is adjusted to oppose and substantially cancel an error-producing portion of the total magnetic field gradient in a particular direction. The magnetic field gradient correction signal(s) can be applied: during a non-selective RF pulse; immediately subsequent to an initial gradient field application (either alone or coincident with a selective 180.degree. RF pulse); during acquisition of response signal data; or at any time to correct for inter-gradient cross-talk conditions.
    • 用于克服核磁共振成像和/或核磁共振光谱成像系统中的瞬态磁场梯度不均匀性的方法,其中所述不均匀性由在成像过程本身中使用的脉冲磁场梯度引起,在至少一个校正脉冲信号期间提供至少一个校正脉冲信号 或之后,将所需磁场施加到在系统中要被研究的样品。 脉冲信号特性中的至少一个被调整为与特定方向上的总磁场梯度的误差产生部分相对并基本上消除。 可以应用磁场梯度校正信号:在非选择性RF脉冲期间; 紧随着初始梯度场应用(单独或与选择性180°RF脉冲一致); 在获取响应信号数据期间; 或在任何时候纠正梯级间串扰条件。