Title:
MAGNET OPPOSITION TYPE PERMANENT MAGNET MAGNETIC CIRCUIT AND METHOD OF REGULATING ITS MAGNETIC FIELD
Document Type and Number:
Japanese Patent JP3151129
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To easily realize an uniform magnetic field, and the regulation of magnetic field by fixing a magnetic field regulating magnet or magnetic material to a magnetic shunt plate surface, arranging a shim plate closer to the cavity side from a gradient coil, and fixing a magnetic field regulating magnet or magnetic material onto the shim plate.
SOLUTION: A magnetic shunt plate 16 has an annular projection 161 (first shim), and a circumferential stepped part (higher shim), which is not shown, can be particularly formed on a bottom part 162 as occasion demands. A gradient coil 18 and a shim plate 19 are housed in the recessed part of the magnetic shunt plate, and fixed to the magnetic shunt plate 16, respectively. A magnetic field regulating shim materials 20 and 21 are fixed onto the magnetic shunt plate bottom part 162 and the shim plate 19, and shimming regulation is performed on both the magnetic shunt plate and the shim plate. The nonmagnetic shim plate 19 is formed on the gradient coil 18, the shim material 21 is further fixed on (or under) the shim plate, the shim material 20 is fixed to the magnetic shunt plate bottom part 162 on the magnetic shunt plate 16, and the magnetic fine control is performed by shimming regulation.
More Like This:
| WO/1988/008126 | MAGNETIC FIELD GENERATING APPARATUS |
| WO/2005/114242 | TOOL AND METHOD FOR SHIMMING A MAGNET |
Inventors:
Ken Ohashi
Koji Miyata
Yoneda Yūhito
Yuji Inoue
Koji Miyata
Yoneda Yūhito
Yuji Inoue
Application Number:
JP21854995A
Publication Date:
April 03, 2001
Filing Date:
August 28, 1995
Export Citation:
Assignee:
Shin-Etsu Chemical Co., Ltd.
GE Yokogawa Medical System Co., Ltd.
GE Yokogawa Medical System Co., Ltd.
International Classes:
G01R33/3873; A61B5/055; H01F7/02; (IPC1-7): A61B5/055; G01R33/3873; H01F7/02
Domestic Patent References:
| JP975324A | ||||
| JP61276309A | ||||
| JP1164356A | ||||
| JP4186703A | ||||
| JP383903U | ||||
| JP587962B2 |
Other References:
【文献】米国特許5864275(US,A)
【文献】米国特許5963117(US,A)
【文献】欧州特許出願公開760484(EP,A2)
【文献】欧州特許出願公開985934(EP,A1)
【文献】米国特許5963117(US,A)
【文献】欧州特許出願公開760484(EP,A2)
【文献】欧州特許出願公開985934(EP,A1)
Attorney, Agent or Firm:
Ryoichi Yamamoto (1 person outside)
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