发明授权
US4820988A Magnetic gradient coil set for nuclear magnetic resonace system having
substantially different coil-patient spacings
失效
用于具有基本上不同线圈 - 患者间隔的核磁共振系统的磁梯度线圈组
- 专利标题: Magnetic gradient coil set for nuclear magnetic resonace system having substantially different coil-patient spacings
- 专利标题(中): 用于具有基本上不同线圈 - 患者间隔的核磁共振系统的磁梯度线圈组
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申请号: US105738申请日: 1987-10-07
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公开(公告)号: US4820988A公开(公告)日: 1989-04-11
- 发明人: Lawrence E. Crooks , Joseph W. Carlson
- 申请人: Lawrence E. Crooks , Joseph W. Carlson
- 申请人地址: CA Berkeley
- 专利权人: The Regents of the University of California
- 当前专利权人: The Regents of the University of California
- 当前专利权人地址: CA Berkeley
- 主分类号: G01R33/20
- IPC分类号: G01R33/20 ; A61B5/055 ; G01R33/38 ; G01R33/385
摘要:
In a gradient coil set for a magnetic resonance system, the y gradient coils are located substantially closer to the patient than are the x and z gradient coils. As a result, one may design the y gradient coils to produce a stronger y gradient, to have reduced inductance or otherwise better tailor the magnetic/electrical properties of the gradient coil set for MRI imaging sequences. In the exemplary embodiment, at least portions of the y gradient coils have a first spacing from the z-axis while the x and z gradient coils have a second substantially larger spacing from the z-axis. Furthermore, while the x and z gradient coils are centered about the z-axis in the patient access space, alternate sides of the y gradient coil set are centered about respectively off-set centers vertically displaced from the z-axis center of the patient access area. The result is a substantially rectangular or elliptical patient access opening with horizontal dimensions defined by the x, z coils sets and vertical dimensions defined by the y coil set.
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