System of permanent magnets for an intense magnetic field
    21.
    发明授权
    System of permanent magnets for an intense magnetic field 失效
    强磁场永磁体系统

    公开(公告)号:US4937545A

    公开(公告)日:1990-06-26

    申请号:US295218

    申请日:1988-11-01

    CPC分类号: H01F7/0284 G01R33/383

    摘要: Permanent magnets for producing an intense field. A main magnetic circuit comprises two magnets (1, 1'), two pole pieces (2, 2') and a yoke (3). Two additional magnets (6, 6') of opposite magnetization reinforce the field in the air gap (5) while extending into the latter between edges (25, 25', 26, 26', 27, 27', 28, 28') of magnets (1, 1') and pole pieces (2, 2'). Application to imaging by magnetic resonance (tomography).

    摘要翻译: PCT No.PCT / FR88 / 00116 Sec。 371日期:1988年11月1日 102(e)1988年11月1日PCT PCT。 出版物WO88 / 06798 日期:1988年9月7日。用于产生强烈场地的永磁体。 主磁路包括两个磁体(1,1'),两个极片(2,2')和磁轭(3)。 具有相反磁化强度的两个附加磁体(6,6')增强了气隙(5)中的磁场,同时在边缘(25,25',26,26',27,27',28,28')之间延伸到磁隙中。 的磁体(1,1')和极片(2,2')。 应用于磁共振成像(层析成像)。

    System of coils for producing magnetic field gradients of very uniform
polarization in an imaging or spectroscopy installation by NMR
    22.
    发明授权
    System of coils for producing magnetic field gradients of very uniform polarization in an imaging or spectroscopy installation by NMR 失效
    用于通过NMR在成像或光谱装置中产生非常均匀极化的磁场梯度的线圈系统

    公开(公告)号:US4833410A

    公开(公告)日:1989-05-23

    申请号:US033801

    申请日:1987-04-03

    CPC分类号: G01R33/385

    摘要: A system of coils is disclosed for the production of imaging by nuclear magnetic resonance of gradients Gx and Gy. The system of coils is disposed on the outer surface of a straight cylinder of revolution of axis Oz and radius R. The coils include four patterns of conductor wires which are pairwise symmetrical with respect to a center O and pairwise symmetrical with respect to the vertical plane xOy. Each pattern has three arcs participating in the production of the gradient which is required. That is, two outward arcs are located close to the center O at respective distances h.sub.1 and h.sub.2 from plane xOy and a return arc is spaced further from the center O and is located at a distance H.sub.3 from the plane xOy. Each arc has three section a, b and c, with the two end sections a and c having the same length being traversed by a current which has one-half the intensity of the current passing through the central section b.

    摘要翻译: 公开了一种线圈系统,用于通过梯度Gx和Gy的核磁共振产生成像。 线圈系统设置在轴线Oz和半径R的直线圆筒的外表面上。线圈包括相对于中心O成对对称并且相对于垂直平面成对对称的四根导线图案 xOy。 每个模式都有三个弧参与生产所需的梯度。 也就是说,两个向外的弧位于距平面xOy的相应距离h1和h2处靠近中心O处,并且返回弧距离中心O进一步间隔开并且距离平面x 0y定位在距离H3处。 每个弧具有三个部分a,b和c,两个端部部分a和c具有相同长度的电流,该电流具有通过中心部分b的电流强度的一半。