发明名称 |
Quadrature surface coils for magnetic resonance imaging |
摘要 |
A thin dielectric sheet (36) has a first or loop coil (30) defined on one surface thereof and a second or Helmholtz coil (32) defined on an obverse surface thereof. The dielectric sheet and associated coils may be laid flat (FIG. 3) or bent to match a selected curved surface of the subject (FIGS. 6-8). The first and second coils are arranged symmetrically about an axis or plane of symmetry (34). The first coil has an associated magnetic field along a y-axis and the second coil has an associated magnetic field along the x-axis. Circuits (40 and (42) tune the first and second magnetic resonance coils to a preselected magnetic resonance frequency. Magnetic resonance signals of the selected frequency received by one of the coils are phase shifted 90 DEG by a phase shifting circuit (50) and combined with the unphase shifted signals from the other coil by a combining circuit (52). The combined signals are amplified (54) and conveyed to electronic image processing circuitry (E) of a magnetic resonance scanner.
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申请公布号 |
US4918388(A) |
申请公布日期 |
1990.04.17 |
申请号 |
US19880234278 |
申请日期 |
1988.08.19 |
申请人 |
PICKER INTERNATIONAL, INC. |
发明人 |
MEHDIZADEH, MEHRDAD;MOLYNEAUX, DAVID A.;HOLLAND, G. NEIL |
分类号 |
A61B5/055;G01R33/32;G01R33/34;G01R33/341;G01R33/36 |
主分类号 |
A61B5/055 |
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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