JPS6428805A - Electromagnet with magnetic shield - Google Patents
Electromagnet with magnetic shieldInfo
- Publication number
- JPS6428805A JPS6428805A JP62183410A JP18341087A JPS6428805A JP S6428805 A JPS6428805 A JP S6428805A JP 62183410 A JP62183410 A JP 62183410A JP 18341087 A JP18341087 A JP 18341087A JP S6428805 A JPS6428805 A JP S6428805A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- terminal plate
- magnetic field
- side hole
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
PURPOSE:To reduce the nonuniform component of magnetic field generated by a magnetic coil as well as to enhance the effect of magnetic shielding of the title electromagnet by a method wherein, in a magnetic shield having asymmetric side holes, the center aperture of the terminal plate having the side hole is made asymmetric with respect to the center axis. CONSTITUTION:The magnetic shield 3 made of a ferromagnetic material is composed of a cylindrical yoke 4, the terminal plate 5a having a center aperture 6a and a side hole 10, and the terminal plate 5b having a center aperture 6b. The center aperture 6a of the terminal plate 5, having the side hole 14, is made asymmetric to the center axis, and the aperture diameter on the side of the side hole 10 is formed equivalently small. As a result, the components such as z, y, zy, z<2>y and the like of the magnetic field gradient with respect to z-axis and y-axis is reduced, and the uniformity of the magnetic field can be improved. Consequently, the nonuniform component of the magnetic field produced by a magnetic coil can be reduced, and the effect of magnetic shielding can also be enhanced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62183410A JPS6428805A (en) | 1987-07-24 | 1987-07-24 | Electromagnet with magnetic shield |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62183410A JPS6428805A (en) | 1987-07-24 | 1987-07-24 | Electromagnet with magnetic shield |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6428805A true JPS6428805A (en) | 1989-01-31 |
Family
ID=16135294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62183410A Pending JPS6428805A (en) | 1987-07-24 | 1987-07-24 | Electromagnet with magnetic shield |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6428805A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5136273A (en) * | 1988-10-17 | 1992-08-04 | Kabushiki Kaisha Toshiba | Magnet apparatus for use in a magnetic resonance imaging system |
-
1987
- 1987-07-24 JP JP62183410A patent/JPS6428805A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5136273A (en) * | 1988-10-17 | 1992-08-04 | Kabushiki Kaisha Toshiba | Magnet apparatus for use in a magnetic resonance imaging system |
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