公开(公告)号：US20100271028A1

公开(公告)日：2010-10-28

申请号：US12766006

申请日：2010-04-23

申请人： Hiromi KAWAMOTO

发明人： Hiromi KAWAMOTO

IPC分类号： G01R33/44

CPC分类号： G01R33/3873 ,  G01R33/3856

摘要： A magnetic resonance imaging apparatus includes; a gradient coil that applies a gradient magnetic field to a static magnetic field in which an examined subject is placed; a metal shim with which the gradient coil is provided and that corrects spatial nonuniformity of the static magnetic field; an executing unit that executes an imaging sequence; and a controlling unit that, before execution of the imaging sequence is started, raises the temperature of the metal shim up to a saturation temperature that is to be reached during the execution of the imaging sequence.

摘要翻译： 磁共振成像装置包括： 将梯度磁场施加到被检查对象被放置的静态磁场的梯度线圈; 提供梯度线圈的金属垫片，并校正静磁场的空间不均匀性; 执行成像序列的执行单元; 以及控制单元，其在开始成像序列的执行之前，将金属垫片的温度升高到在执行成像序列期间将达到的饱和温度。

公开(公告)号：US5867027A

公开(公告)日：1999-02-02

申请号：US687205

申请日：1996-07-25

申请人： Hiromi Kawamoto

发明人： Hiromi Kawamoto

IPC分类号： G01R33/385 ,  A61B5/055 ,  G01R33/421 ,  H01F7/20 ,  G01V3/00

CPC分类号： G01R33/4215

摘要： In a magnetic resonance imaging apparatus, gradient magnetic fields and a radiofrequency magnetic field are applied to a subject placed in a static magnetic field to excite nucleuses and generate magnetic resonance signals. A magnetic resonance image is reconstructed on the basis of the magnetic resonance signals. The gradient magnetic fields are produced by gradient coils. A very high-speed imaging method such as an echo planar method requires shield coils to magnetically shield, to the outside, the magnetic fields generated by the primary coils. It is very difficult to drive the primary coils and the shield coils by one amplifier to raise gradient magnetic fields having a relatively high strength within a short period of time. The primary coils and the shield coils are divided into a plurality of groups, and currents are individually supplied to the plurality of groups to allow to raise the gradient magnetic fields having a relatively high strength within the short period of time.

摘要翻译： 在磁共振成像装置中，将梯度磁场和射频磁场施加到放置在静磁场中的对象以激发核并产生磁共振信号。 基于磁共振信号重建磁共振图像。 梯度磁场由梯度线圈产生。 诸如回波平面法之类的非常高速的成像方法需要屏蔽线圈将由初级线圈产生的磁场磁屏蔽到外部。 通过一个放大器来驱动初级线圈和屏蔽线圈是非常困难的，以在短时间内提升具有相对较高强度的梯度磁场。 初级线圈和屏蔽线圈被分成多组，并且电流被分别提供给多个组，以允许在短时间段内提高具有相对较高强度的梯度磁场。

公开(公告)号：US5684815A

公开(公告)日：1997-11-04

申请号：US467679

申请日：1995-06-06

申请人： Kiyotaka Miura ,  Hiromi Kawamoto ,  Yoshinori Kubota ,  Natsuya Nishimura ,  Yasushi Kita

发明人： Kiyotaka Miura ,  Hiromi Kawamoto ,  Yoshinori Kubota ,  Natsuya Nishimura ,  Yasushi Kita

IPC分类号： H01S3/06 ,  H01S3/094 ,  H01S3/16 ,  H01S3/17

CPC分类号： H01S3/0602 ,  H01S3/094092 ,  H01S3/1603 ,  H01S3/163 ,  H01S3/17

摘要： An upconversion laser material includes a micro-sphere which is doped with an ion of a rare earth element and made of one selected from the group consisting of crystals and glasses. Thus, the micro-sphere achieves the light confinement therein and serves as a resonator. Therefore, the Q-value of the resonator becomes large. With this, it is possible to obtain the upconversion laser oscillation at room temperature.

摘要翻译： 上转换激光材料包括掺杂有稀土元素的离子并由选自晶体和玻璃的一种制成的微球。 因此，微球实现其中的光限制并且用作谐振器。 因此，谐振器的Q值变大。 由此，可以在室温下获得上变频激光振荡。

公开(公告)号：US5488299A

公开(公告)日：1996-01-30

申请号：US31185

申请日：1993-03-12

申请人： Masafumi Kondo ,  Hiromi Kawamoto

发明人： Masafumi Kondo ,  Hiromi Kawamoto

IPC分类号： G01R33/421 ,  G01V3/00

CPC分类号： G01R33/4215

摘要： A nuclear magnetic resonance imaging with improved image quality and operation efficiency. It uses an active shield coil with an outer shielding coil having at least two coil turns which are provided on a plurality of separate layers and mutually connected electrically, in order to reduce the heat generation. The eddy current in the shielding coil is reduced by providing a slit portion thereon. The eddy current compensation is achieved by using an appropriate eddy current compensation pulse to minimize a residual eddy current magnetic field within a desired field of view according to a model of a general expression of the residual eddy current magnetic field after the eddy current compensation. The optimum setting of the system parameters for various imaging pulse sequences is achieved for the undetermined gradient coil configuration as well as for the predetermined gradient coil configuration, according to a mathematical model analysis of various imaging pulse sequences.

摘要翻译： 具有提高图像质量和运行效率的核磁共振成像。 它使用具有至少两个线圈匝的外屏蔽线圈的有源屏蔽线圈，其设置在多个分开的层上并相互电连接，以便减少发热。 通过在其上设置狭缝部分来减小屏蔽线圈中的涡流。 涡流补偿通过使用合适的涡流补偿脉冲来实现，以根据涡流补偿后的残余涡流磁场的一般表达式的模型来最小化期望视野内的残余涡流磁场。 根据各种成像脉冲序列的数学模型分析，对于未确定的梯度线圈配置以及预定的梯度线圈配置，可实现各种成像脉冲序列的系统参数的最佳设置。

公开(公告)号：US20080246480A1

公开(公告)日：2008-10-09

申请号：US12078710

申请日：2008-04-03

申请人： Hiromi KAWAMOTO

发明人： Hiromi KAWAMOTO

IPC分类号： G01R33/3815

CPC分类号： G01R33/4215 ,  G01R33/385 ,  Y10T29/49071

摘要： A passive type shield coil, disposed to a magnetic resonance imaging apparatus, for shielding of a magnetic flux of a gradient magnetic field at an inner circumference side generated by a gradient coil for generating the gradient magnetic field, and set at an outer circumference side of the gradient coil, has a coil body formed of a portion including a superconducting material and a portion including a non-superconducting material.

摘要翻译： 一种无源型屏蔽线圈，设置在磁共振成像装置上，用于屏蔽由用于产生梯度磁场的梯度线圈产生的内周侧的梯度磁场的磁通量，并设置在 梯度线圈具有由包括超导材料的部分和包括非超导材料的部分形成的线圈体。

公开(公告)号：US6054854A

公开(公告)日：2000-04-25

申请号：US903689

申请日：1997-07-31

申请人： Hiromi Kawamoto

发明人： Hiromi Kawamoto

IPC分类号： G01R33/34 ,  A61B5/055 ,  G01R33/38 ,  G01R33/381 ,  G01R33/385 ,  H01F5/00 ,  G01V3/00

CPC分类号： G01R33/381 ,  G01R33/385

摘要： Although magnet coil windings are distributed discontinuously, the distribution of magnetic fields generated actually approaches a desired continuous distribution. The desired continuous distribution is defined analytically, as closely as possible. A system for acquiring magnetic resonance data has a coil segment formed by winding a conductor on a bobbin representing an axial direction. A magnetic field is generated by supplying current into the conductor. Winding positions at which the conductor is wound turn-by-turn on the bobbin are determined in agreement with a specified current step value and sequentially from a winding positioned at an outermost end of the coil segment in the axial direction. Additionally, a shunt element for shunting the current carried turn-by-turn is arranged in the coil segment in relation to a pattern of turns of the coil segment by winding the conductor into a plurality of current flows through a plurality of shunt paths.

摘要翻译： 尽管电磁线圈绕组分布不连续，但是所产生的磁场分布实际上接近期望的连续分布。 尽可能地分析地定义所需的连续分布。 用于获取磁共振数据的系统具有通过将导体缠绕在表示轴向的线轴上而形成的线圈段。 通过向导体提供电流产生磁场。 线圈上的绕组绕组的绕组位置与规定的电流阶跃值一致并且从位于线圈段的最外端的绕组沿轴向顺序地确定。 此外，用于分流绕组电流的分流元件通过将导体卷绕成多个分流路径中的多个电流而相对于线圈段的匝的模式布置在线圈段中。

公开(公告)号：US5773976A

公开(公告)日：1998-06-30

申请号：US588058

申请日：1996-01-19

申请人： Yoshitomo Sakakura ,  Hiromi Kawamoto ,  Masafumi Kondo

发明人： Yoshitomo Sakakura ,  Hiromi Kawamoto ,  Masafumi Kondo

IPC分类号： G01R33/387 ,  A61B5/055 ,  G01R33/3875 ,  G01R33/20 ,  A61B5/00

CPC分类号： G01R33/3875 ,  Y10S318/02

摘要： An MRI system is provided for improving the magnetic coupling and positional relationship between gradient coils and shim coils, thus simplifying positioning of the coils (retention of orthogonality), designing an MRI system compactly, and reducing cost. An MRI system comprises a magnet generating a static magnetic field and a gradient coil unit generating a gradient magnetic field superposed on the static magnetic field. The gradient coil unit is formed into a substantially cylindrical shape having an outer circumferential surface, and shields the gradient magnetic field from being leaked out into a radially outer space. The MRI system further comprises a shim coil unit generating a correcting magnetic field homogenizing the static magnetic field. The shim coil unit is mounted on the outer circumferential surface of the gradient coil unit in common serving as a bobbin for the shim coil unit.

摘要翻译： 提供MRI系统，用于改善梯形线圈和垫片线圈之间的磁耦合和位置关系，从而简化线圈的定位（保持正交性），紧凑地设计MRI系统，并降低成本。 MRI系统包括产生静磁场的磁体和产生叠加在静磁场上的梯度磁场的梯度线圈单元。 梯度线圈单元形成为具有外圆周表面的大致圆柱形形状，并且屏蔽梯度磁场不会泄漏到径向外部空间中。 MRI系统还包括产生校正磁场的匀场线圈单元，该矫正磁场使静磁场均匀化。 垫片线圈单元共同地安装在梯形线圈单元的外圆周表面上，用作垫片线圈单元的线轴。

公开(公告)号：US4551260A

公开(公告)日：1985-11-05

申请号：US634023

申请日：1984-07-24

申请人： Masanori Hayakawa ,  Noriaki Yamada ,  Hiromi Kawamoto ,  Satoshi Nishimura

发明人： Masanori Hayakawa ,  Noriaki Yamada ,  Hiromi Kawamoto ,  Satoshi Nishimura

IPC分类号： C01G49/00 ,  C01G51/00 ,  C01G53/00 ,  G11B5/706 ,  H01F1/11 ,  C04B35/26

CPC分类号： C01G49/009 ,  C01G49/0036 ,  C01G51/00 ,  C01G53/00 ,  G11B5/70678 ,  H01F1/11 ,  C01P2002/30 ,  C01P2002/52 ,  C01P2004/20 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2006/42

摘要： In preparing fine and plate-shaped particles of a ferrite having the magnetoplumbite structure by hydrothermal treatment of a powder of .gamma.-Fe.sub.2 O.sub.3 or (FeO).sub.x.Fe.sub.2 O.sub.3, where O

摘要翻译： 在通过水热处理γ-Fe 2 O 3或（FeO）x.Fe 2 O 3，其中O

公开(公告)号：US08536869B2

公开(公告)日：2013-09-17

申请号：US12766006

申请日：2010-04-23

申请人： Hiromi Kawamoto

发明人： Hiromi Kawamoto

IPC分类号： G01V3/00

CPC分类号： G01R33/3873 ,  G01R33/3856

摘要： A magnetic resonance imaging apparatus includes; a gradient coil that applies a gradient magnetic field to a static magnetic field in which an examined subject is placed; a metal shim with which the gradient coil is provided and that corrects spatial nonuniformity of the static magnetic field; an executing unit that executes an imaging sequence; and a controlling unit that, before execution of the imaging sequence is started, raises the temperature of the metal shim up to a saturation temperature that is to be reached during the execution of the imaging sequence.

摘要翻译： 磁共振成像装置包括： 将梯度磁场施加到被检查对象被放置的静态磁场的梯度线圈; 提供梯度线圈的金属垫片，并校正静磁场的空间不均匀性; 执行成像序列的执行单元; 以及控制单元，其在开始成像序列的执行之前，将金属垫片的温度升高到在执行成像序列期间将达到的饱和温度。

公开(公告)号：US07777489B2

公开(公告)日：2010-08-17

申请号：US12078710

申请日：2008-04-03

申请人： Hiromi Kawamoto

发明人： Hiromi Kawamoto

IPC分类号： G01V3/00

CPC分类号： G01R33/4215 ,  G01R33/385 ,  Y10T29/49071

摘要： A passive shim coil is disposed in a magnetic resonance imaging (MRI) apparatus for shielding magnetic flux of a gradient magnetic field at an inner circumference side generated by a gradient coil, and is set at an outer circumference side of the gradient coil. The coil body is formed of a portion including a superconducting material and a portion including a non-superconducting material.

摘要翻译： 被动垫片线圈设置在用于屏蔽由梯度线圈产生的内周侧的梯度磁场的磁通量的磁共振成像（MRI）装置中，并设置在梯度线圈的外周侧。 线圈体由包括超导材料的部分和包括非超导材料的部分形成。