Superconducting magnet apparatus for MRI
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0305010
(2005-12-19)
|
등록번호 |
US-7382134
(2008-06-03)
|
우선권정보 |
JP-2005-181996(2005-06-22) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Mitsubishi Denki Kabushiki Kaisha
|
대리인 / 주소 |
Buchanan Ingersoll & Rooney PC
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
3 |
초록
▼
In a superconducting magnets for MRI configured to generate a homogeneous magnetic field and a gradient magnetic field in a space between a top superconducting magnet and a bottom superconducting magnet, the bottom superconducting magnet is provided with a supporting member that supports a helium ve
In a superconducting magnets for MRI configured to generate a homogeneous magnetic field and a gradient magnetic field in a space between a top superconducting magnet and a bottom superconducting magnet, the bottom superconducting magnet is provided with a supporting member that supports a helium vessel, and the supporting member is fixed to a vacuum vessel of the bottom superconducting magnet at one end, and is fixed to the floor surface in the vicinity of the end fixed to the vacuum vessel. A high-quality MR image can be thus obtained by preventing direct transmission of oscillation of the gradient coils to the superconducting magnet and reducing oscillation of the gradient coils while achieving a reduction of the overall superconducting magnet in size.
대표청구항
▼
What is claimed is: 1. A superconducting magnet apparatus for MRI, comprising: a top superconducting magnet and a bottom superconducting magnet spaced apart from each other with the top superconducting magnet being on top of the bottom superconducting magnet, each of the top and bottom superconduct
What is claimed is: 1. A superconducting magnet apparatus for MRI, comprising: a top superconducting magnet and a bottom superconducting magnet spaced apart from each other with the top superconducting magnet being on top of the bottom superconducting magnet, each of the top and bottom superconducting magnets including a superconducting coil group formed of plural superconducting coils, a helium vessel for accommodating the superconducting coil group, a vacuum vessel for accommodating the helium vessel and providing vacuum insulation by maintaining an interior under vacuum, and a heat shield that is provided in a space between the helium vessel and the vacuum vessel to block off radiation heat from the vacuum vessel; a connection portion for connecting integrally the top superconducting magnet and the bottom superconducting magnet; and a pair of gradient coils provided, respectively, to opposing inner surfaces of the top superconducting magnet and the bottom superconducting magnet to generate a gradient magnetic field, wherein: a homogeneous magnetic field and a gradient magnetic field are generated in a space between the top superconducting magnet and the bottom superconducting magnet; the bottom superconducting magnet is provided with a supporting member for supporting the helium vessel of the bottom superconducting magnet connected integrally to the helium vessel of the top superconducting magnet via the connection portion; and the supporting member is fixed to the helium vessel of the bottom superconducting magnet at one end and to the vacuum vessel of the bottom superconducting magnet at another end, and is fixed to a floor surface in a vicinity of the end fixed to the vacuum vessel. 2. The superconducting magnet apparatus for MRI according to claim 1, wherein: the supporting member comprises a vertical direction supporting member for supporting the helium vessel against a force in a vertical direction, and a radius direction supporting member for supporting the helium vessel against forces in a radius direction and in a circumferential direction. 3. The superconducting magnet apparatus for MRI according to claim 1, wherein: concave portions are provided in the opposing inner surfaces of the top superconducting magnet and the bottom superconducting magnet, and the gradient coils are disposed in the concave portions. 4. The superconducting magnet apparatus for MRI according to claim 1, further comprising: a reattachable top supporting member provided for the helium vessel of the top superconducting magnet. 5. The superconducting magnet apparatus for MRI according to claim 4, wherein: the top supporting member comprises a vertical direction top supporting member for supporting the helium vessel of the top superconducting magnet against a force in a vertical direction, and a radius direction top supporting member for supporting the helium vessel of the top superconducting magnet against forces in a radius direction and in a circumferential direction. 6. The superconducting magnet apparatus for MRI according to claim 4, further comprising: a fixing plate for fixing a vacuum vessel side of the top supporting member; and a bellows attached in a space between the fixing plate and the vacuum vessel of the top superconducting magnet to achieve a structure that makes one end of the top supporting member free without breaking a vacuum in the vacuum vessel of the top superconducting magnet. 7. The superconducting magnet apparatus for MRI according to claim 4, further comprising: a fixing mechanism for fixing a vacuum vessel side of the top supporting member; and an O-ring attached to a space between the fixing mechanism and a portion fixed to the vacuum vessel to achieve a structure that makes one end of the top supporting member free without breaking a vacuum in the vacuum vessel. 8. The superconducting magnet apparatus for MRI according to claim 7, wherein the fixing mechanism is a bolt and a nut. 9. The superconducting magnet apparatus for MRI according to claim 1, wherein: the connection portion that connects the top superconducting magnet and the bottom superconducting magnet is provided singularly. 10. The superconducting magnet apparatus for MRI according to claim 1, further comprising mass bodies provided in central holes in the top superconducting magnet and the bottom superconducting magnet, and fixed to central portions of the gradient coils, respectively. 11. The superconducting magnet apparatus for MRI according to claim 10, wherein: end portions of the mass bodies are respectively fixed to the vacuum vessel of the top superconducting magnet and the vacuum vessel of the bottom superconducting magnet via elastic bodies. 12. The superconducting magnet apparatus for MRI according to claim 1, wherein: the connection portion comprises a connection pillar for connecting the helium vessel of the top superconducting magnet and the helium vessel of the bottom superconducting magnet, and serving as a support against a mass of the top superconducting magnet and electromagnetic forces acting between the helium vessel of the top superconducting magnet and the helium vessel of the bottom superconducting magnet. 13. The superconducting magnet apparatus for MRI according to claim 1, further comprising: a gas tube for emitting a gas into and discharging a gas from the respective helium vessels of the top and bottom superconducting magnets; and a stress absorbing member provided at a mid point of the gas tube. 14. The superconducting magnet apparatus for MRI according to claim 1, further comprising: a connection member for connecting the pair of the gradient coils; a beam structure member for connecting the connection member to the connection portion of the top and bottom superconducting magnets; and a buffer interposed between the beam structure member and the connection portion of the top and bottom superconducting magnets. 15. The superconducting magnet apparatus for MRI according to claim 1, further comprising: a connection member for connecting the pair of the gradient coils; a pillar attached to a base of the bottom superconducting magnet; and a beam-shaped member for connection member and the pillar. 16. The superconducting magnet apparatus for MRI according to claim 1, further comprising: a mass body having a large mass and provided under the bottom superconducting magnet; and a fixing plate of the bottom superconducting magnet connected to the mass body.
이 특허에 인용된 특허 (3)
-
Motoshiromizu,Hirofumi; Suzuki,Kunihito; Watanabe,Hiroyuki, Magnetic resonance imaging apparatus.
-
Laskaris Evangelos Trifon ; Wang Yu ; Alexander James Pellegrino, Open magnet with floor mount.
-
Laskaris Evangelos Trifon ; Thompson Paul Shadforth ; Wang Yu, Superconductive magnet including a cryocooler coldhead.
이 특허를 인용한 특허 (5)
-
Tsuda, Munetaka, Adjustment method of a magnetic resonance imaging apparatus.
-
Tsuda, Munetaka, Adjustment method of a magnetic resonance imaging apparatus.
-
Tamura, Hajime, Superconducting magnet and method for adjusting the same.
-
Kruip, Marcel; Mann, Nicholas, Supported superconducting magnet.
-
Kruip, Marcel; Mann, Nicholas, Supported superconducting magnet.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.