Magnetic resonance imaging device with vibration suppression

Patent metadata

Field	Value
Publication number	US-9618592-B2
Application number	US-201214237190-A
Country	US
Kind code	B2
Filing date	Aug 10, 2012
Priority date	Sep 30, 2011
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A device includes: a static magnetic field generating device including static magnetic field generating sources generating a homogeneous magnetic field in a space; gradient magnetic field generating sources superimposing a gradient magnetic field on the homogeneous magnetic field, and conductor rings arranged between the static magnetic field generating sources and the gradient magnetic field generating sources in a pair of arranging regions on both sides in a direction of the homogeneous magnetic field in a region where the homogeneous magnetic field is generated (imaging region), respectively, the conductor rings being separated from each other and making a pair. The conductor rings are mechanically connected to the gradient magnetic field generating device or the static magnetic field generating device. This provides an MRI device 1 capable of reduction in vibration with suppression of the image quality deterioration of the tomographic images.

First claim

The invention claimed is:

1. A magnetic resonance imaging device comprising a gradient magnetic field generating device, the gradient magnetic field generating device comprising:
a gradient magnetic field generating source generating a gradient magnetic field in space; and
conductor rings arranged on a side outside the gradient magnetic field generating source opposite to the space where the gradient magnetic field is generated, in a pair of arranging regions on both sides of a region of a homogenous magnetic field in a direction of the homogeneous magnetic field, respectively, the conductor rings being separated from each other and making a pair.

2. A magnetic resonance imaging device comprising:
a static magnetic field generating device including a static magnetic field generating source generating a homogeneous magnetic field in a space;
a gradient magnetic field generating device including a gradient magnetic field generating source superimposing a gradient magnetic field on the homogeneous magnetic field;
conductor rings arranged between the static magnetic field generating source and the gradient magnetic field generating source in a pair of arranging regions on both sides, in a direction of the homogeneous magnetic field, of a region of the homogeneous magnetic field, respectively, the conductor rings being separated from each other and making a pair.

3. The magnetic resonance imaging device as claimed in claim 2 , wherein a plurality of conductor rings are arranged in a pair of the arranging regions, respectively.

4. The magnetic resonance imaging device as claimed in claim 2 , wherein conductor rings are mechanically connected to the gradient magnetic field generating device.

5. The magnetic resonance imaging device as claimed in claim 2 , wherein conductor rings are mechanically connected to the static magnetic field generating device.

6. The magnetic resonance imaging device as claimed in claim 2 , wherein conductor rings comprise:
a first conductor ring mechanically connected to the gradient magnetic field generating device; and
a second conductor ring mechanically connected to the static magnetic field generating device, arranged so as to face the first conductor ring, and insulated from the first conductor ring.

7. The magnetic resonance imaging device as claimed in claim 6 , wherein conductor rings comprise a third conductor ring arranged between the first and second conductor rings and insulated from the first and second conductor rings.

8. The magnetic resonance imaging device as claimed in claim 6 , further comprising an elastic body disposed between the first and second conductor rings.

9. The magnetic resonance imaging device as claimed in claim 2 , wherein the conductor rings comprise:
a first conductor ring mechanically connected to the gradient magnetic field generating device and arranged so as to face the static magnetic field generating device; and
a second conductor ring mechanically connected to the static magnetic field generating device, arranged so as to face the gradient magnetic field generating device and not to face the first conductor ring, and insulated from the first conductor ring.

10. The magnetic resonance imaging device as claimed in claim 2 , wherein the conductor ring has an electric resistivity per a unit plate thickness that is lower than an electric resistivity of an outer wall of the gradient magnetic field generating device per unit plate thickness.

11. A magnetic resonance imaging device comprising a static magnetic field generating device, the static magnetic field generating device comprising:
a static magnetic field generating source generating a homogeneous magnetic field in a space; and
conductor rings arranged on a side outside the static magnetic field generating source, the side being opposite to the space where a gradient magnetic field is generated, in a pair of arranging regions on both sides in a direction of the homogeneous magnetic field of a region of the homogeneous magnetic field, respectively, the conductor rings being separated from each other and making a pair.

Assignees

• Kawamura Takeshi
• Imamura Yukinobu
• Abe Mitsushi
• Honda Takuro
• Takeuchi Hiroyuki
• Hitachi Ltd

Inventors

• Kawamura Takeshi
• Imamura Yukinobu
• Abe Mitsushi
• Honda Takuro
• Takeuchi Hiroyuki

Classifications

• G01R33/3854

  means for active and/or passive vibration damping or acoustical noise suppression in gradient magnet coil systems · CPC title

• G01R33/56518

  due to eddy currents, e.g. caused by switching of the gradient magnetic field · CPC title

• G01R33/389 Primary

  Field stabilisation {, e.g. by field measurements and control means or indirectly by current stabilisation} · CPC title

• G01R33/4215

  of the gradient magnetic field, e.g. using passive or active shielding of the gradient magnetic field · CPC title