公开(公告)号：US6154029A

公开(公告)日：2000-11-28

申请号：US286642

申请日：1999-04-02

申请人： Shoei Miyamoto ,  Susumu Kosugi

发明人： Shoei Miyamoto ,  Susumu Kosugi

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/561 ,  G01R33/565 ,  G01V3/00

CPC分类号： G01R33/56554 ,  G01R33/5615 ,  G01R33/5617

摘要： In order to reduce ghosts due to increasing echo intensity fall-off in the course of an echo train in MR imaging employing the FSE method, the present method assigns individual echoes in the echo train to respective segments to acquire data F(S1-S3), then assigns individual echoes arranged in the reverse order to the respective segments so that the order of signal intensity magnitude in the data F is inverted, to acquire data R(S4-S5), adds the data F and R for each view, and produces an image from the sum data. The number of echoes in the echo train is preferably selected to be an even number.

摘要翻译： 为了减少在使用FSE方法的MR成像中的回波串训练过程中增加的回波强度下降的鬼影，本方法将回波序列中的各个回波分配给各个段，以获得数据F（S1-S3） ，然后将以相反顺序排列的各个回波分配给相应的段，使得数据F中的信号强度幅度的顺序被反转，以获取数据R（S4-S5），为每个视图添加数据F和R，以及 从和数据生成图像。 回波串中的回波数优选地选择为偶数。

公开(公告)号：US06359436B1

公开(公告)日：2002-03-19

申请号：US09560528

申请日：2000-04-21

申请人： Shoei Miyamoto ,  Susumu Kosugi

发明人： Shoei Miyamoto ,  Susumu Kosugi

IPC分类号： G01V300

CPC分类号： G01R33/56518

摘要： In order to provide a selective excitation method and apparatus that is not affected by the non-linearity of a gradient magnetic field, and a magnetic resonance imaging method and apparatus employing such a selective excitation apparatus, a frequency f is employed as an RF excitation frequency, corresponding to a slice position Zc redefined differently from a specified slice position Za according to a non-linearity error in a gradient magnetic field Gz. Alternatively, the gradient is adjusted so that the frequency of spins at a specified slice position Za equals to a frequency f of the RF excitation signal.

摘要翻译： 为了提供不受梯度磁场的非线性影响的选择性激励方法和装置，以及采用这种选择性激励装置的磁共振成像方法和装置，采用频率f作为RF激励频率 ，对应于根据梯度磁场Gz中的非线性误差与指定的切片位置Za不同地重新定义的切片位置Zc。 或者，调整梯度，使得在指定切片位置Za处的自旋频率等于RF激励信号的频率f。

公开(公告)号：US6054853A

公开(公告)日：2000-04-25

申请号：US122403

申请日：1998-07-25

申请人： Shoei Miyamoto ,  Koichi Oshio ,  Susumu Kosugi

发明人： Shoei Miyamoto ,  Koichi Oshio ,  Susumu Kosugi

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01N24/08 ,  G01R33/20 ,  G01R33/54 ,  G01R33/561 ,  G01V3/00

CPC分类号： G01R33/4835 ,  G01R33/5618

摘要： In order to enable the application of a forcible recovery pulse to the multi-slice technique, when selective inversion pulses satisfy the CPMG condition or the CP condition and ETL (Echo Train Length) is even, a dummy selective inversion pulse is applied at the end of each pulse sequence of the fast spin echo technique for each slice, then a dummy read axis gradient is applied without acquiring MR data, then a refocusing pulse selective of only the current slice is applied, and subsequently a forcible recovery pulse sequence FR selective of only the current slice is applied.

摘要翻译： 为了能够对多层技术应用强制恢复脉冲，当选择性反转脉冲满足CPMG条件或CP条件并且ETL（回波列长度）为偶数时，在末端应用虚拟选择性反转脉冲 对于每个切片的快速自旋回波技术的每个脉冲序列，然后应用虚拟读轴梯度而不获取MR数据，然后施加仅对当前切片进行选择的重聚焦脉冲，随后施加强制恢复脉冲序列FR选择性 只应用当前切片。

公开(公告)号：US07459909B2

公开(公告)日：2008-12-02

申请号：US11871882

申请日：2007-10-12

申请人： Jiabin Yao ,  Kai Cao ,  Cunli Zhang ,  Shinong Fu ,  Shoei Miyamoto

发明人： Jiabin Yao ,  Kai Cao ,  Cunli Zhang ,  Shinong Fu ,  Shoei Miyamoto

IPC分类号： G01V3/00

CPC分类号： G01R33/3806 ,  G01R33/383 ,  H01F7/202

摘要： To achieve a good balance among the magnetic field intensity, region of homogeneous magnetic field intensity and cost, a magnetic field generating apparatus for generating a magnetic field in a vertical direction comprises: a pair of magnets having respective magnetic poles with mutually opposite polarities disposed to face each other in a vertical direction, for generating a static magnetic field having different dimensions of its region of homogeneous magnetic field intensity in two mutually orthogonal directions in a horizontal plane; a pair of planar magnetic elements, each element supporting respective one of the pair of the magnets; and a vertical columnar magnetic element lying in a direction different from the two directions, each end of which is joined to respective one of the pair of the planar magnetic elements.

摘要翻译： 为了在磁场强度，均匀磁场强度和成本的区域之间实现良好的平衡，用于在垂直方向上产生磁场的磁场产生装置包括：一对磁体，其具有彼此相反极性的各自的磁极， 在垂直方向上彼此面对，用于在水平面中在两个相互正交的方向上产生其均匀磁场强度区域的尺寸不同的静态磁场; 一对平面磁性元件，每个元件支撑所述一对磁体中的相应一个; 以及位于与所述两个方向不同的方向上的垂直柱状磁性元件，其每个端部与所述一对所述平面磁性元件中的每一个连接。

公开(公告)号：US06483305B1

公开(公告)日：2002-11-19

申请号：US09597527

申请日：2000-06-20

申请人： Shoei Miyamoto

发明人： Shoei Miyamoto

IPC分类号： G01V300

CPC分类号： G01R33/56518

摘要： In order to reduce residual magnetization caused by gradient pulses, for a gradient pulse having either a positive or negative polarity, a residual magnetization reducing pulse is applied after applying the gradient pulse, or for two or more successively applied gradient pulses having different polarities, the amplitude of the gradient pulse(s) is adjusted to reduce residual magnetization thereafter.

摘要翻译： 为了减少由梯度脉冲引起的剩余磁化，对于具有正极性或负极性的梯度脉冲，在施加梯度脉冲之后或者对于具有不同极性的两个或更多个连续施加的梯度脉冲施加剩余磁化减小脉冲， 调整梯度脉冲的振幅以减小其后的剩余磁化强度。

公开(公告)号：US06470203B2

公开(公告)日：2002-10-22

申请号：US09770041

申请日：2001-01-25

申请人： Shoei Miyamoto

发明人： Shoei Miyamoto

IPC分类号： A61B505

CPC分类号： G01R33/56518 ,  G01R33/56563

摘要： The present invention aims to reduce degradation in image quality due to residual magnetization. In a pulse sequence of a high-speed spin echo process, a pre-pulse is applied before an excitation pulse, and a correction pulse for correcting a phase error caused by the pre-pulse is applied before an initial inversion pulse.

摘要翻译： 本发明旨在减少由剩余磁化引起的图像质量降低。 在高速自旋回波处理的脉冲序列中，在激励脉冲之前施加预脉冲，并且在初始反转脉冲之前施加用于校正由预脉冲引起的相位误差的校正脉冲。

公开(公告)号：US20080088310A1

公开(公告)日：2008-04-17

申请号：US11871882

申请日：2007-10-12

申请人： Jiabin Yao ,  Kai Cao ,  Cunli Zhang ,  Shinong Fu ,  Shoei Miyamoto

发明人： Jiabin Yao ,  Kai Cao ,  Cunli Zhang ,  Shinong Fu ,  Shoei Miyamoto

IPC分类号： G01R33/48 ,  H01F7/127

CPC分类号： G01R33/3806 ,  G01R33/383 ,  H01F7/202

摘要： To achieve a good balance among the magnetic field intensity, region of homogeneous magnetic field intensity and cost, a magnetic field generating apparatus for generating a magnetic field in a vertical direction comprises: a pair of magnets having respective magnetic poles with mutually opposite polarities disposed to face each other in a vertical direction, for generating a static magnetic field having different dimensions of its region of homogeneous magnetic field intensity in two mutually orthogonal directions in a horizontal plane; a pair of planar magnetic elements, each element supporting respective one of the pair of the magnets; and a vertical columnar magnetic element lying in a direction different from the two directions, each end of which is joined to respective one of the pair of the planar magnetic elements.

摘要翻译： 为了在磁场强度，均匀磁场强度和成本的区域之间实现良好的平衡，用于在垂直方向上产生磁场的磁场产生装置包括：一对磁体，其具有彼此相反极性的各自的磁极， 在垂直方向上彼此面对，用于在水平面中在两个相互正交的方向上产生其均匀磁场强度区域的尺寸不同的静态磁场; 一对平面磁性元件，每个元件支撑所述一对磁体中的相应一个; 以及位于与所述两个方向不同的方向上的垂直柱状磁性元件，其每个端部与所述一对所述平面磁性元件中的每一个连接。

公开(公告)号：US07205766B2

公开(公告)日：2007-04-17

申请号：US11284119

申请日：2005-11-21

申请人： Shoei Miyamoto

发明人： Shoei Miyamoto

IPC分类号： G01V3/00 ,  H01F3/00 ,  G01R33/46

CPC分类号： G01R33/3815 ,  G01R33/3854

摘要： The present invention is intended to provide a magnet apparatus obviating the necessity of shield coils designed to suppress eddy currents. The magnet apparatus has gradient coils disposed in a bore of a cylindrical superconducting magnet, and includes a cylindrical structure that is realized with a combination of tiles made of a high-permeability material and that is interposed between the internal surface of the superconducting magnet and the external surface of the gradient coils. The tiles made of a high-permeability material are laminates made of a high-permeability material. The high-permeability material is a silicon steel plate or an amorphous magnetic material.

摘要翻译： 本发明旨在提供一种磁体装置，其不需要设计成抑制涡流的屏蔽线圈。 磁铁装置具有设置在圆柱形超导磁体的孔中的梯度线圈，并且包括圆柱形结构，其通过由高磁导率材料制成的瓦片的组合实现，并且介于超导磁体的内表面和 梯度线圈的外表面。 由高磁导率材料制成的瓷砖是由高透气性材料制成的层压板。 高磁导率材料是硅钢板或非晶磁性材料。

公开(公告)号：US20060113997A1

公开(公告)日：2006-06-01

申请号：US11284119

申请日：2005-11-21

申请人： Shoei Miyamoto

发明人： Shoei Miyamoto

IPC分类号： G01V3/00

CPC分类号： G01R33/3815 ,  G01R33/3854

摘要： The present invention is intended to provide a magnet apparatus obviating the necessity of shield coils designed to suppress eddy currents. The magnet apparatus has gradient coils disposed in a bore of a cylindrical superconducting magnet, and includes a cylindrical structure that is realized with a combination of tiles made of a high-permeability material and that is interposed between the internal surface of the superconducting magnet and the external surface of the gradient coils. The tiles made of a high-permeability material are laminates made of a high-permeability material. The high-permeability material is a silicon steel plate or an amorphous magnetic material.

摘要翻译： 本发明旨在提供一种磁体装置，其不需要设计成抑制涡流的屏蔽线圈。 磁铁装置具有设置在圆柱形超导磁体的孔中的梯度线圈，并且包括圆柱形结构，其通过由高磁导率材料制成的瓦片的组合实现，并且介于超导磁体的内表面和 梯度线圈的外表面。 由高磁导率材料制成的瓷砖是由高透气性材料制成的层压板。 高磁导率材料是硅钢板或非晶磁性材料。

公开(公告)号：US06700376B2

公开(公告)日：2004-03-02

申请号：US10034779

申请日：2001-12-28

申请人： Takao Goto ,  Shoei Miyamoto

发明人： Takao Goto ,  Shoei Miyamoto

IPC分类号： G01V300

CPC分类号： G01R33/3875 ,  G01R33/3806

摘要： To correct static magnetic field intensity and homogeneity of an MRI system, B0 correction coil driving power sources respectively supply correction electric currents to B0 correction coils added to a pair of pillar yokes at the position where an imaging region is interposed therebetween, and the pair of B0 correction coils produce correction magnetic fields in which at least one of the direction and intensity is different, which are then applied to static magnetic fields produced by permanent magnets.

摘要翻译： 为了校正MRI系统的静磁场强度和均匀性，B0校正线圈驱动电源分别向插入成像区域的位置处的一对支柱轭B0校正线圈提供校正电流，并且该对 B0校正线圈产生校正磁场，其中至少一个方向和强度不同，然后将其应用于由永磁体产生的静磁场。