[특허]Method and apparatus for reducing base field shifts in a magnetic resonance device due to pulsed magnetic field gradient

[미국특허] Method and apparatus for reducing base field shifts in a magnetic resonance device due to pulsed magnetic field gradient 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-033/20
출원번호	US-0331424 (1989-03-30)
발명자 / 주소	Egloff Heinz (Fremont CA)
출원인 / 주소	Siemens Medical Systems, Inc. (Iselin NJ 02)
인용정보	피인용 횟수 : 11 인용 특허 : 7

초록 ▼

A magnetic resonance imager/spectrometer including a main magnet having a bore axially formed therethrough in which a base field is formed. A gradient field forming means is positioned inside the bore of the main magnet for providing at least one axial field gradient inside the bore. An electrically conductive media in the main magnet surrounds the gradient coil and has eddy currents induced thereon via pulsing of the gradient field which generates a disturbing magnetic field along said same axis as said gradient field. A gradient position adjusting means, including an adjustable positioner, is used for adjusting the position of the gradient field forming means with respect to the bore of the main magnet in order to cause the center point of the axial magnetic fields of the electrically conductive media and the gradient field forming means to substantially coincide.

대표청구항 ▼

A magnetic resonance device, comprising: a main magnetic having a bore axially formed therethrough in which a base field is formed; gradient field forming means positioned inside said bore of said main magnetic for providing at least one field gradient along a given axis inside said bore and said gradient field forming means; an electrically conductive media located nearby said gradient field forming means which produces at least one disturbing magnetic field along said given axis; and gradient position adjusting means, including an adjustable positioner, for adjusting the position of said gradient field forming means with respect to said bore of said main magnet so as to cause the center point of the magnetic field along said given axis of said gradient field forming means to substantially coincide with the center point of the disturbing magnetic field along said given axis.

이 특허에 인용된 특허 (7) 인용/피인용 타임라인 분석

Savelainen Matti (Espoo FIX), Coil arrangement for producing a homogeneous magnetic field.
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Prammer Manfred G. (Philadelphia PA) Haselgrove John C. (Swarthmore PA), Device and method for automatic shimming of NMR instrument.
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Punchard William F. B. (Sudbury MA) Pillsbury Robert D. (Newton MA), Magnetic resonance imaging systems.
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Buford J. Philip (513 N. Boston Ave. De Land FL 32724), Magnetic system for nuclear magnetic resonance diagnostic device.
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Vermilyea Mark E. (Schenectady NY), Method of passively shimming magnetic resonance magnets.
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Double ; Glen P. ; Kahwaty ; Vincent N. ; Randall ; James D. ; Reinhart ; Fritz M., NMR magnet assembly with pole face parallelism adjustment.
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Huson Frederick R. (The Woodlands TX), Unitary superconducting electromagnet.
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이 특허를 인용한 특허 (11) 인용/피인용 타임라인 분석

Jiang, Longzhi; Scaturro, Jr., John; Einziger, William; Lvovsky, Yuri; McDonald, Robbi; Diao, Xiaoxue, Apparatus and method to improve magnet stability in an MRI system.
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Danby Gordon T. (Wading River NY) Jackson John W. (Shoreham NY) Brukl Charles E. (Fort Salonga NY) Gudimetta Krishna M. (Hammond LA) Rimkunas Joseph F. (Massapequa NY), Eddy current control in NMR imaging system.
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Schuster, Johann; Stocker, Stefan, Insertion device for gradient coils of a magnetic resonance apparatus.
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Khetan, Raghunath P.; Islam, Mohammad S.; Mielke, Matt; Magnus, Brian J.; Sebastian, Tomy; Wittig, Charmaine; Glumm, William D.; Koscielecki, Joe, Magnetic apparatus and method of manufacturing the magnetic apparatus.
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Han, Hui; Balcom, Bruce, Magnetic field gradient monitor apparatus and method.
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Balcom, Bruce; Green, Derrick; Han, Hui, Magnetic resonance apparatus and method.
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Schaaf, Michael, Magnetic resonance apparatus with a movable gradient coil unit.
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Young Ian R. (Nr. Marlborough GB2), Magnetic resonance methods.
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Egloff Heinz (Fremont CA), Method and apparatus for compensating eddy current effects in a magnetic resonance device having pulsed magnetic field g.
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Lazar, Razvan; Schramm, Martin, Mounting for a body coil of a magnetic resonance device.
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Kralick, James Howard; Battista, Frank; Leach, Jeffrey Edward; Becker, Dennis Ambrose, System and method for locating a gradient coil.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Method and apparatus for reducing base field shifts in a magnetic resonance device due to pulsed magnetic field gradient 원문보기