JP2004016657A5 - - Google Patents

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JP2004016657A5
JP2004016657A5 JP2002178898A JP2002178898A JP2004016657A5 JP 2004016657 A5 JP2004016657 A5 JP 2004016657A5 JP 2002178898 A JP2002178898 A JP 2002178898A JP 2002178898 A JP2002178898 A JP 2002178898A JP 2004016657 A5 JP2004016657 A5 JP 2004016657A5
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magnetic
magnetic field
static
field generator
static magnetic
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互いに対向する一対の磁極と、この一対の磁極の互いに対向する面側に形成された環状の強磁性体からなる突起と、上記一対の磁極を支持する柱状の継鉄とを備え、上記一対の磁極の互いに対向する面側の空間に静磁場を発生する磁気共鳴イメージング装置の静磁場発生装置において、A pair of magnetic poles opposed to each other, a protrusion made of an annular ferromagnetic body formed on the surfaces of the pair of magnetic poles opposed to each other, and a columnar yoke supporting the pair of magnetic poles. In a static magnetic field generator of a magnetic resonance imaging apparatus that generates a static magnetic field in a space on the opposite sides of magnetic poles,
上記磁極を構成する部材の磁気特性は、この磁極の少なくとも一部が他の部分と異なることを特徴とする磁気共鳴イメージング装置用の静磁場発生装置。A static magnetic field generator for a magnetic resonance imaging apparatus, characterized in that at least a part of the magnetic pole is different from other parts in the magnetic characteristics of the members constituting the magnetic pole. 請求項１記載の静磁場発生装置において、上記環状の突起を構成する部材の磁気特性は、この環状突起の少なくとも一部が他の部分と異なることを特徴とする静磁場発生装置。 2. The static magnetic field generator according to claim 1 , wherein at least a part of the annular protrusion is different from the other parts in the magnetic characteristics of the members constituting the annular protrusion. 請求項１又は２記載の静磁場発生装置において、上記磁極及び環状突起の柱状継鉄に面する側の部分と、上記磁極及び環状突起の柱状継鉄に面する側とは反対側に位置する部分とは、互いに磁気特性が異なることを特徴とする静磁場発生装置。 The static magnetic field generator according to claim 1 or 2, wherein a portion of the magnetic pole and the annular protrusion facing the columnar yoke is located on a side opposite to the side of the magnetic pole and the annular protrusion facing the columnar yoke. The static magnetic field generator characterized in that the magnetic characteristics are different from each other. 請求項１又は２記載の静磁場発生装置において、上記磁極及び環状突起の材料に、飽和磁化の異なる複数の材料を使用して、上記磁極及び環状突起の柱状継鉄に面する側の部分と、上記磁極及び環状突起の柱状継鉄に面する側とは反対側に位置する部分とは、互いに磁気特性が異なるようにしたことを特徴とする静磁場発生装置。 The static magnetic field generator according to claim 1 or 2 , wherein a plurality of materials having different saturation magnetizations are used as materials for the magnetic pole and the annular projection, and a portion of the magnetic pole and the annular projection facing the columnar yoke is used. A static magnetic field generating apparatus characterized in that the magnetic properties of the magnetic pole and the portion of the annular projection on the side opposite to the side facing the columnar yoke are different from each other. 請求項１又は２記載の静磁場発生装置において、上記磁極及び環状突起の柱状継鉄に面する側の部分と、上記磁極及び環状突起の柱状継鉄に面する側とは反対側に位置する部分とで、磁化方向が互いに異方性を有する材料を使用することを特徴とする静磁場発生装置。 The static magnetic field generator according to claim 1 or 2, wherein a portion of the magnetic pole and the annular protrusion facing the columnar yoke is located on a side opposite to the side of the magnetic pole and the annular protrusion facing the columnar yoke. A static magnetic field generating apparatus using a material having magnetization directions anisotropic to each other. 互いに対向する一対の磁極と、この一対の磁極の互いに対向する面側に形成された環状の強磁性体からなる突起と、上記一対の磁極を支持する柱状の継鉄とを備え、上記一対の磁極の互いに対向する面側の空間に静磁場を発生する磁気共鳴イメージング装置の静磁場発生装置において、
上記柱状継鉄の上記空間側の面に配置され、柱状継鉄の面方向に平行な磁化容易軸を有する強磁性体を備えることを特徴とする磁気共鳴イメージング装置用の静磁場発生装置。A pair of magnetic poles opposed to each other, a protrusion made of an annular ferromagnetic body formed on the surfaces of the pair of magnetic poles opposed to each other, and a columnar yoke supporting the pair of magnetic poles. In the static magnetic field generator of the magnetic resonance imaging apparatus that generates a static magnetic field in the space on the side of the magnetic poles facing each other,
A static magnetic field generator for a magnetic resonance imaging apparatus, comprising: a ferromagnetic material disposed on the space-side surface of the columnar yoke and having an easy magnetization axis parallel to the surface direction of the columnar yoke. 互いに対向する一対の磁極と、この一対の磁極の互いに対向する面側に形成された環状の強磁性体からなる突起とを備え、上記一対の磁極の互いに対向する面側の空間に静磁場を発生する、磁気共鳴イメージング装置の静磁場発生装置において、
上記一方の磁極に形成される環状突起と、他方の磁極に形成される環状突起は、互いに磁気特性が異なることを特徴とする磁気共鳴イメージング装置用の静磁場発生装置。A pair of magnetic poles facing each other and a protrusion made of an annular ferromagnetic body formed on the surfaces facing each other of the pair of magnetic poles, and a static magnetic field is applied to the space on the surface facing the pair of magnetic poles In the generated static magnetic field generator of the magnetic resonance imaging apparatus,
A static magnetic field generator for a magnetic resonance imaging apparatus, wherein the annular protrusion formed on the one magnetic pole and the annular protrusion formed on the other magnetic pole have different magnetic characteristics. 請求項７記載の静磁場発生装置において、上記環状突起の材料に、飽和磁化の異なる複数の材料を使用して、上記一方の磁極に形成される環状突起と、他方の磁極に形成される環状突起とが、互いに磁気特性が異なるようしたことを特徴とする静磁場発生装置。 8. The static magnetic field generator according to claim 7 , wherein a plurality of materials having different saturation magnetizations are used as the material of the annular protrusion, and the annular protrusion formed on the one magnetic pole and the annular protrusion formed on the other magnetic pole. A static magnetic field generator, wherein the protrusions have different magnetic characteristics. 静磁場発生装置と、傾斜磁場発生手段と、高周波磁場を発生する照射コイルと、核磁気共鳴信号を受信する受信コイルと、断層画像を作成する画像作成手段とを有する磁気共鳴イメージング装置において、In a magnetic resonance imaging apparatus having a static magnetic field generation device, a gradient magnetic field generation means, an irradiation coil that generates a high-frequency magnetic field, a reception coil that receives a nuclear magnetic resonance signal, and an image creation means that creates a tomographic image.
上記静磁場発生装置は、請求項１から８のうちのいずれか一項記載の静磁場発生装置であることを特徴とする磁気共鳴イメージング装置。9. The magnetic resonance imaging apparatus according to claim 1, wherein the static magnetic field generation apparatus is the static magnetic field generation apparatus according to any one of claims 1 to 8.
JP2002178898A 2002-06-19 2002-06-19 Magnetic resonance imaging system Expired - Fee Related JP3984874B2 (en)

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JP2002178898A JP3984874B2 (en) 2002-06-19 2002-06-19 Magnetic resonance imaging system

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JP2002178898A JP3984874B2 (en) 2002-06-19 2002-06-19 Magnetic resonance imaging system

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JP2004016657A JP2004016657A (en) 2004-01-22
JP2004016657A5 true JP2004016657A5 (en) 2005-10-20
JP3984874B2 JP3984874B2 (en) 2007-10-03

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JP4671287B2 (en) * 2005-12-22 2011-04-13 独立行政法人国立がん研究センター Magnetic generator

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