[특허]Magnetic field generating device for MRI

[미국특허] Magnetic field generating device for MRI 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-033/20
출원번호	US-0550081 (1990-07-09)
우선권정보	JP-0176054 (1989-07-07)
발명자 / 주소	Sakurai Hideya (Mishima JPX) Aoki Masaaki (Mishima JPX) Ohnishi Youichi (Mishima JPX)
출원인 / 주소	Sumitomo Special Meter Co., Ltd. (Osaka JPX 03)
인용정보	피인용 횟수 : 51 인용 특허 : 0

초록 ▼

Disclosed is an MRI-dedicated magnetic field generating device for generating magnetic fields within an air gap, including: a pair of permanent magnet assemblies opposite to each other to form an air gap therebetween; yokes for magnetically linking the permanent magnet assemblies; and magnetic pole pieces fixed to air-gap-confronting surfaces thereof. Based on this construction, intensities of the magnetic fields are increased by disposing a plurality of magnetic material segments on the same circle or a concentric circle on the confronting surface thereof or decreased by disposing a plurality of permanent magnet segments having a magnetizing direction opposite to that of the permanent magnet assemblies on the same circle or the concentric circle on the confronting surface thereof; or alternatively both the magnetic material segments and the permanent magnet segments are disposed on the same circle or the concentric circle.

대표청구항 ▼

A magnetic field-generating device for MRI having a pair of permanent magnet assemblies disposed oppositely with respect to each other to form an air gap therebetween, an object to be examined being inserted into said air gap, yokes for magnetically linking said paired permanent magnet assemblies and a pair of magnetic pole pieces mounted fixedly on the oppositely faced surfaces of the permanent magnet assemblies so that paired magnetic pole pieces are confronting oppositely to each other through said air gap, thereby creating an air space of spherical volume having a uniform magnetic field intensity at the center of said air gap, the improvement in the magnetic field generating device comprising: a plurality of magnetic elements selected from the group consisting of magnetic material segments and permanent magnet segments for adjusting the magnetic field intensity being located concentrically on each of said magnetic pole pieces to equalize average values of the magnetic field intensity on a plurality of circles defined by horizontally cutting the air spaces of spherical volume, each of the average values of which is obtained by measuring the magnetic field intensity at a plurality of points on a circumference of the same circle each of said magnetic pole pieces to eliminate fluctuations of the magnetic field intensity which are measured at points on each of imaginary circumferences of the outermost circles and a radius of said air space of spherical volume is set to be smaller than a radius of a circle formed by the magnetic elements located on the periphery of the magnetic pole piece.

이 특허를 인용한 특허 (51) 인용/피인용 타임라인 분석

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[미국특허] Magnetic field generating device for MRI 원문보기