发明名称 |
Method and apparatus for MRI using selectively shaped image volume of homogeneous NMR polarizing field |
摘要 |
An electromagnet shim coil is utilized for temporarily altering the shape of a volume in which there is provided a substantially homogeneous NMR polarizing field. By temporarily energizing the electromagnet shim coil and thus altering the shape of the volume, magnetic resonance imaging can take place in other than a substantially spherical volume (e.g., in an elongated ellipsoidal-like volume extending axially along a patient so as to encompass a longer section of the spinal column). In the exemplary embodiment, the electromagnet shim coil takes the form of a pancake-like coil with windings positioned so as to create fourth power spherical harmonic in a transverse magnet-type of MRI system.
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申请公布号 |
US5490509(A) |
申请公布日期 |
1996.02.13 |
申请号 |
US19930033552 |
申请日期 |
1993.03.18 |
申请人 |
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA |
发明人 |
CARLSON, JOSEPH W.;KAUFMAN, LEON |
分类号 |
G01R33/3415;G01R33/38;G01R33/3875;(IPC1-7):A61B5/055 |
主分类号 |
G01R33/3415 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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