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61. 发明授权

US06864682B2 Method for vibration compensation in a magnetic resonance tomography apparatus 有权
标题翻译：磁共振断层摄影装置中的振动补偿方法
公开(公告)号：US06864682B2
公开(公告)日：2005-03-08
申请号：US10438588
申请日：2003-05-15
申请人： Joerg Fontius , Volker Weissenberger
发明人： Joerg Fontius , Volker Weissenberger
IPC分类号： G01R33/3815 , G01R33/389 , G01V3/00
CPC分类号： G01R33/389 , G01R33/3815
摘要： In a method for the compensation of disturbances due to vibrations in a magnetic resonance tomography apparatus s having a cryo-head seated on a cryostat for cooling a superconducting magnet and having a compensation device for correcting the magnetic field fluctuations generated due to the vibrations of the cryo-head, the compensation device sets the synthesizer frequency and/or the gradient currents according to the time curve of the field terms of the 0th and/or 1st orders acquired in a tune-up.
摘要翻译：在用于补偿由于在具有用于冷却超导磁体的低温恒温器上的低温头的磁共振断层摄影装置中的振动的干扰的补偿方法中，并且具有用于校正由于该超导磁体的振动而产生的磁场波动的补偿装置低温头，补偿装置根据在调谐中获取的0和/或1阶的场项的时间曲线来设置合成器频率和/或梯度电流。

62. 发明授权

US06850066B2 Systems and methods for gradient compensation in magnetic resonance imaging 有权
标题翻译：磁共振成像中梯度补偿的系统和方法
公开(公告)号：US06850066B2
公开(公告)日：2005-02-01
申请号：US10438523
申请日：2003-05-15
申请人： Timothy J. Havens , Xianrui Huang , David T Ryan
发明人： Timothy J. Havens , Xianrui Huang , David T Ryan
IPC分类号： G01R33/385 , A61B5/055 , G01R33/3875 , G01R33/389 , G01R33/421 , G01V3/00
CPC分类号： G01R33/4215 , G01R33/3875 , G01R33/389
摘要： A gradient compensation system comprising a magnet assembly, at least one field-generating gradient coil operable for generating magnetic field gradients in three orthogonal coordinates, and at least one gradient compensation coil positioned adjacent to the magnet assembly and operable for generating a magnetic field to compensate for leakage fields. A system for eliminating image distortion in magnetic resonance imaging comprising a magnet assembly comprising an imaging gradient coil and an imaging volume, and at least one gradient compensation coil positioned adjacent to the magnet assembly operable for generating gradient compensation fields in response to the magnetic field change. A method for counter-acting unwanted fields generated by eddy currents in conducting structures of a magnetic resonance system comprising generating a magnetic field change signal indicative of a change in a magnetic field of an imaging volume, determining a compensation signal in response to the magnetic field change signal, adding at least one gradient compensation coil to the magnetic resonance imaging system, and controlling current through the at least one gradient compensation coil.
摘要翻译：一种梯度补偿系统，包括磁体组件，至少一个场产生梯度线圈，其可操作用于产生三个正交坐标中的磁场梯度，以及至少一个梯度补偿线圈，所述至少一个梯度补偿线圈位于与所述磁体组件相邻并且可操作以产生磁场以补偿用于泄漏场。一种用于消除磁共振成像中的图像失真的系统，包括包括成像梯度线圈和成像体积的磁体组件，以及至少一个位于磁体组件附近的梯度补偿线圈，其可操作用于响应于磁场变化产生梯度补偿场。一种用于在磁共振系统的导电结构中由涡流产生的反作用不需要的场的方法，包括产生指示成像体积的磁场变化的磁场变化信号，响应于磁场确定补偿信号改变信号，将至少一个梯度补偿线圈添加到磁共振成像系统，以及控制通过至少一个梯度补偿线圈的电流。

63. 发明申请

US20040263165A1 Methods and apparatus for imaging systems 失效
标题翻译：成像系统的方法和装置
公开(公告)号：US20040263165A1
公开(公告)日：2004-12-30
申请号：US10607747
申请日：2003-06-27
发明人： Weijun Shen , Jinhua Huang
IPC分类号： G01V003/00
CPC分类号： G01R33/389
摘要： A method of operating an imaging system having a main coil and a shield coil electromagnetically coupled to the main coil, wherein the method includes monitoring for an external environmental fluctuation of electromagnetism, and controlling current flow through the main and shield coils based upon the monitoring using a quench heater.
摘要翻译：一种操作具有与主线圈电磁耦合的主线圈和屏蔽线圈的成像系统的方法，其中所述方法包括监视电磁场的外部环境波动，以及基于使用所述主线圈和所述屏蔽线圈的监视来控制通过所述主屏蔽线圈的电流淬火加热器。

64. 发明授权

US06703836B2 Magnetic resonance apparatus isolation system 失效
标题翻译：磁共振器隔离系统
公开(公告)号：US06703836B2
公开(公告)日：2004-03-09
申请号：US09964567
申请日：2001-09-28
申请人： Ralf Ladebeck , Guenter Schnur
发明人： Ralf Ladebeck , Guenter Schnur
IPC分类号： G01V300
CPC分类号： G01R33/389 , G01R33/56563
摘要： A nuclear magnetic resonance tomograph or an imaging magnetic resonance apparatus (1) has a magnet (3) which is isolated in terms of vibration from a surrounding structure, in particular a building floor (15), by an isolation system (17). The isolation system (17) has an actively controlled isolation module (23) which is preferably designed to damp non-acoustic vibrations, in particular vibrations with a frequency of less than 50 Hz. According to a preferred embodiment, moreover, a passive isolation module (21) with a vibration-damping material (D) is present. A particularly high degree of isolation of the magnet (3) from the surrounding structure can be achieved with the aid of the isolation system (17).
摘要翻译：核磁共振断层摄影机或成像磁共振装置（1）具有通过隔离系统（17）从周围结构，特别是建筑物地板（15）的振动隔离的磁体（3）。隔离系统（17）具有主动控制的隔离模块（23），其优选地被设计成阻尼非声学振动，特别是频率小于50Hz的振动。此外，根据优选实施例，存在具有减振材料（D）的无源隔离模块（21）。借助隔离系统（17）可以实现磁体（3）与周围结构的特别高的隔离度。

65. 发明申请

US20040014236A1 Frequency feedback for NMR magnet temperature control 审中-公开
标题翻译： NMR磁体温度控制的频率反馈
公开(公告)号：US20040014236A1
公开(公告)日：2004-01-22
申请号：US10200644
申请日：2002-07-22
发明人： Dror Albo , Tal Cohen , Uri Rapoport
IPC分类号： G01N024/00
CPC分类号： G01R33/389 , Y10T436/24
摘要： Methods and systems to control the temperature of a source of a fixed or permanent magnetic field used in Nuclear Magnetic Resonance (NMR) by sensing, measuring, or otherwise detecting the differences in the resonant or Larmor frequency, and based on the difference in the resonant or Larmor frequency, changing the temperature of the source of the fixed magnetic field. The temperature change can thus be based on the frequency change and the characteristics of the source (e.g., permanent and/or fixed magnet(s)), including the temperature coefficient of the source.
摘要翻译：通过感测，测量或以其他方式检测谐振或拉莫尔频率的差异以及基于共振的差异来控制核磁共振（NMR）中使用的固定或永久磁场的源的温度的方法和系统或Larmor频率，改变固定磁场源的温度。因此，温度变化可以基于频率变化和源的特性（例如，永久和/或固定磁体），包括源的温度系数。

66. 发明授权

US06433550B1 MRI magnet with vibration compensation 失效
标题翻译： MRI磁体具有振动补偿
公开(公告)号：US06433550B1
公开(公告)日：2002-08-13
申请号：US09782250
申请日：2001-02-13
申请人： Ilmari Kinanen
发明人： Ilmari Kinanen
IPC分类号： G01V300
CPC分类号： G01R33/389 , G01R33/56563
摘要： In an open magnetic resonance system, pole pieces (16, 18) on opposite sides of an imaging region (10) are supported by a ferrous flux return path (20). During normal operation, environmental disturbances that cause low frequency vertical vibrations in the floor cause corresponding fluctuations in the main field of the magnet. A spacing between the pole pieces (16, 18) expands and contracts with the vibration causing a strength of the main field to fluctuate. A force transducer (60) under the magnet assembly measures the magnitude of the vibrations. A vibration analyzer (62) analyzes the vibrations waveform and calculates compensation for the changes in the interpole spacing. The vibration analyzer (62) controls one or more of a shim coil (70) which produces a field equal and opposite to the main field fluctuations, a reconstruction processor (52) to compensate for magnetic field resonance frequency fluctuations attributable to the main field fluctuations, and gradient magnetic fields applied by gradient field coils (22, 24).
摘要翻译：在开放式磁共振系统中，成像区域（10）的相对侧上的极片（16,18）由铁质磁通返回路径（20）支撑。在正常运行中，导致地面低频垂直振动的环境扰动引起磁铁主场相应的波动。极靴（16,18）之间的间距随着振动而膨胀和收缩，导致主场强度波动。磁体组件下方的力传感器（60）测量振动的大小。振动分析仪（62）分析振动波形，并计算补偿间距的变化。振动分析器（62）控制产生与主场波动相等且相反的场的垫片线圈（70）中的一个或多个，用于补偿归因于主场波动的磁场共振频率波动的重建处理器（52），以及由梯度场线圈（22,24）施加的梯度磁场。

67. 发明授权

US6037775A Method and apparatus for magnetic field stabilization in a MRI system 失效
标题翻译： MRI系统中磁场稳定的方法和装置
公开(公告)号：US6037775A
公开(公告)日：2000-03-14
申请号：US908691
申请日：1997-08-07
申请人： Rajendra Shenoy , David Hertz , Terry Morrone , Sudhir Moolky
发明人： Rajendra Shenoy , David Hertz , Terry Morrone , Sudhir Moolky
IPC分类号： G01R33/389 , G01V3/00
CPC分类号： G01R33/389
摘要： A method of stabilizing the static magnetic field in a magnetic resonance imaging (MRI) system applies a radio frequency pulse to a test sample within the static magnetic field and an NMR signal is acquired from the test sample. A characteristic of a signal indicative of the NMR signal, such as the area, phase or the sum of the differences of sampled values is ascertained. In addition, the number of recurring features, such as zero-crossings, of the signal indicative of the NMR signal can be determined and a correction signal is generated to adjust the static magnetic field via a set of correction coils driven by a signal derived from the number of recurring features and the value of the characteristic. Apparatus for stabilizing the static magnetic field is also disclosed.
摘要翻译：在磁共振成像（MRI）系统中稳定静磁场的方法将静脉中的测试样本施加射频脉冲，并从测试样品获取NMR信号。确定指示NMR信号的信号的特性，例如面积，相位或采样值的差的总和。此外，可以确定表示NMR信号的信号的重复特征（例如过零点）的数量，并且产生校正信号，以经由由一个由重复特征数量和特征值。还公开了用于稳定静磁场的装置。

68. 发明授权

US5227728A Gradient driver control in magnetic resonance imaging 失效
标题翻译：磁共振成像中梯度驱动控制
公开(公告)号：US5227728A
公开(公告)日：1993-07-13
申请号：US786828
申请日：1991-11-01
申请人： Leon Kaufman , Joseph W. Carlson , Richard Gran
发明人： Leon Kaufman , Joseph W. Carlson , Richard Gran
IPC分类号： A61B5/055 , G01R33/12 , G01R33/381 , G01R33/385 , G01R33/389
CPC分类号： G01R33/385 , G01R33/389
摘要： Electromagnet coil driving circuitry in a magnetic resonance imaging system is modified to include a flux-driven closed-loop real-time feedback control. The result is more accurate and efficient control of the net actual gradient flux generated by the coil even in the presence of magnetic circuit materials exhibiting hysteresis effects and/or electrical conductors giving rise to eddy current effects. Such driver control can be used to simultaneously correct the magnetic flux changes induced by environmental, ambient or other outside disturbances affecting the net magnetic field within a patient imaging volume of a magnetic resonance imaging system.
摘要翻译：磁共振成像系统中的电磁线圈驱动电路被修改为包括磁通驱动的闭环实时反馈控制。结果是即使在存在导致涡流效应的磁滞效应的磁路材料和/或电导体的情况下，线圈产生的净实际梯度通量的更精确和有效的控制。可以使用这样的驱动器控制来同时校正由影响磁共振成像系统的患者成像体积内的净磁场的环境，环境或其它外部干扰引起的磁通量变化。

69. 发明授权

US5214383A MRI apparatus with external magnetic field compensation 失效
标题翻译：具有外部磁场补偿的MRI装置
公开(公告)号：US5214383A
公开(公告)日：1993-05-25
申请号：US778305
申请日：1991-10-16
申请人： Robert J. Perlmutter , Brian P. Wilfley , Rick Motamedi , John Moberly
发明人： Robert J. Perlmutter , Brian P. Wilfley , Rick Motamedi , John Moberly
IPC分类号： G01R33/24 , G01R33/389 , G01R33/565 , G01R33/58
CPC分类号： G01R33/389 , G01R33/24 , G01R33/583 , G01R33/56563
摘要： External field compensation is provided for MRI apparatus which is in a magnetically noisy environment such as that caused by nearby subway trains. By means of a magnetometer type sensor, the external field fluctuation is sensed and after being adjusted for the filtering effect of the magnet structure of the MRI device itself, the master oscillator of the MRI device is adjusted to compensate for the external field fluctuation. Alternatively the current of the magnet coil is adjusted.
摘要翻译： MRI磁共振装置提供外部场补偿，该装置处于由地铁列车引起的磁性噪声环境中。通过磁力计型传感器，检测外部磁场波动，并且在对MRI装置本身的磁体结构的滤波效果进行调整之后，调整MRI装置的主振荡器以补偿外部场波动。或者，调节电磁线圈的电流。

70. 发明授权

US4899110A Magnetic resonance imaging apparatus with stabilized magnetic field 失效
标题翻译：具有稳定磁场的磁共振成像装置
公开(公告)号：US4899110A
公开(公告)日：1990-02-06
申请号：US274577
申请日：1988-11-22
申请人： Hiroshi Furukawa
发明人： Hiroshi Furukawa
IPC分类号： A61B10/00 , A61B5/055 , G01R33/20 , G01R33/38 , G01R33/3875 , G01R33/389
CPC分类号： G01R33/3815 , G01R33/3875 , G01R33/389
摘要： In a magnetic resonance imaging apparatus having a superconducting magnet to form a static magnetic field and capable of producing a magnetic resonance image of a test piece placed in the static magnetic field, a static magnetic field correcting coil corrects the intensity of the static magnetic field, and a power source supplies to the coil a current to form a magnetic field having inverse characteristics with respect to the attenuation pattern of the static magnetic field intensity in the superconducting magnet. Since the static magnetic field correcting coil is supplied with such a current, enhances the stability of the static magnetic field at the time of raising such a magnetic field or immediately after changing the intensity thereof.
摘要翻译：在具有超导磁体以形成静磁场并且能够产生放置在静磁场中的测试片的磁共振图像的磁共振成像装置中，静磁场校正线圈校正静磁场的强度，并且电源向线圈提供电流以形成相对于超导磁体中的静态磁场强度的衰减模式具有反特性的磁场。由于静磁场校正线圈被供给这样的电流，因此提高这种磁场时的静磁场的稳定性，或者在改变其强度之后立即提高静磁场的稳定性。

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