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    Gradient coils having increased performance and decreased power consumption for use in MR systems
    4.
    发明授权
    Gradient coils having increased performance and decreased power consumption for use in MR systems 失效
    梯形线圈具有增加的性能和降低功耗，用于MR系统

    公开(公告)号：US5663648A

    公开(公告)日：1997-09-02

    申请号：US686210

    申请日：1996-07-23

    申请人： Barry L. W. Chapman ,  Paul Glover

    发明人： Barry L. W. Chapman ,  Paul Glover

    IPC分类号： A61B5/055 ,  G01R33/385 ,  G01V3/00

    CPC分类号： G01R33/385 ,  G01R33/3852

    摘要： A gradient coil specifically designed to enhance the performance of Magnetic Resonance (MR) imaging and spectroscopy. In particular, the construction of gradient coils for use with resonant gradient power supplies to provide the necessary performance (large electromagnetic fields that can activated and deactivated rapidly) required in MR systems. These gradient coils require considerably less power than those presently employed for comparable performance and provide considerably more performance with existing power supplies. These coils are characterized by having a higher inductance than existing gradients of comparable size. Examples are given for the use of the invention in providing linear axial gradient field via a standard Maxwell gradient coil, with comparisons with existing coils.

    摘要翻译： 专门设计用于提高磁共振（MR）成像和光谱学性能的梯度线圈。 特别地，构建与谐振梯度电源一起使用的梯度线圈，以提供MR系统所需的必要性能（能够激活和去激活的大电磁场）。 这些梯度线圈需要比目前用于可比较性能的功率要低得多的功率，并且与现有的电源相比提供了更多的性能。 这些线圈的特征在于具有比现有可比尺寸的梯度更高的电感。 给出了使用本发明通过标准麦克斯韦梯度线圈提供线性轴向梯度场的实例，与现有线圈进行比较。

    Screened electromagnetic coil of restricted length having optimized field and method
    5.
    发明授权
    Screened electromagnetic coil of restricted length having optimized field and method 失效
    具有优化领域和方法的有限长度的屏蔽电磁线圈

    公开(公告)号：US5266913A

    公开(公告)日：1993-11-30

    申请号：US750809

    申请日：1991-08-27

    申请人： Barry L. W. Chapman

    发明人： Barry L. W. Chapman

    IPC分类号： H01F7/20 ,  G01R33/421 ,  H01F1/00

    CPC分类号： G01R33/4215

    摘要： A primary gradient coil and a screen coil for use with the primary coil are constructed to create a substantially null field adjacent to the screen coil and a substantially distortion free linear gradient field adjacent to the gradient coil. A method is disclosed for generating the coils by considering the screen coil to be of infinite length, deriving a Fourier transform of the axial and other components of the field in which the transform is the sum of the permissible harmonic modes on the coil surface in which a coefficient C.sub.n is derived representing the nth harmonic. A perfect screen coil is created and the number of terms C.sub.n selected using least squares optimization until there is no longer a significant change in the resulting field. Examples are given for creating unscreened, screened, linear, axial and transverse gradient field coils.

    摘要翻译： 与初级线圈一起使用的主梯度线圈和屏幕线圈被构造成产生与屏幕线圈相邻的基本上为零的场和与梯度线圈相邻的基本上无失真的线性梯度场。 公开了一种通过考虑屏幕线圈具有无限长度来产生线圈的方法，导出该场的轴向和其它分量的傅里叶变换，其中变换是线圈表面上的允许谐波模式之和，其中 导出代表第n次谐波的系数Cn。 创建完美的屏幕线圈，并使用最小二乘法优化选择的项数Cn，直到结果字段中不再有显着变化。 给出了创建未屏蔽，屏蔽，线性，轴向和横向梯度场线圈的示例。