公开(公告)号：US20080094064A1

公开(公告)日：2008-04-24

申请号：US11877850

申请日：2007-10-24

申请人： Ludwig Eberler ,  Wolfgang Renz ,  Markus Vester

发明人： Ludwig Eberler ,  Wolfgang Renz ,  Markus Vester

IPC分类号： G01R33/32 ,  A61B5/055

CPC分类号： G01R33/385 ,  A61B5/055 ,  G01R33/34046

摘要： A magnetic resonance system has a basic field magnet system that annularly surrounds an examination volume, a gradient system arranged radially within the basic magnetic system, a radio-frequency shield arranged radially within the gradient system and a whole-body coil arranged radially within the radio-frequency shield. The gradient system is essentially circular, such that the gradient system defines a gradient system axis. With regard to a complete circumference around the gradient system axis, the whole-body coil has a first segment and a second segment complementary to the first segment. The first segment covers an angular range of more than 180° relative to the gradient system axis. The whole-body coil exhibits a constant curvature radius in the first segment and is more gently curved in the second segment than in the first segment. The whole-body coil is arranged in the gradient system such that a radio-frequency field return that is possible in the center of the first segment and a radio-frequency field return that is possible in the center of the second segment are at least approximately equal.

摘要翻译： 磁共振系统具有围绕检查体积的基本场磁体系统，在基本磁系统内径向布置的梯度系统，径向设置在梯度系统内的射频屏蔽体和径向布置在无线电中的全身线圈 频率屏蔽 梯度系统基本上是圆形的，使得梯度系统定义了梯度系统轴。 关于梯度系统轴线周围的完整圆周，全体线圈具有与第一段互补的第一段和第二段。 第一段覆盖相对于梯度系统轴线大于180°的角度范围。 全身线圈在第一段中表现出恒定的曲率半径，并且在第二段中比在第一段中更平缓地弯曲。 整体线圈布置在梯度系统中，使得在第一段的中心可能的射频场返回和在第二段的中心可能的射频场返回至少大约为 等于。

公开(公告)号：US20050189940A1

公开(公告)日：2005-09-01

申请号：US11036727

申请日：2005-01-14

申请人： Thorsten Feiweier ,  Ralf Ladebeck ,  Ralph Oppelt ,  Wolfgang Renz ,  Markus Vester

发明人： Thorsten Feiweier ,  Ralf Ladebeck ,  Ralph Oppelt ,  Wolfgang Renz ,  Markus Vester

IPC分类号： A61B5/055 ,  G01R33/34 ,  G01R33/3415 ,  G01R33/36 ,  G01V3/00

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/543 ,  G01R33/5659

摘要： In a magnetic resonance system and an operating method therefor, a B1 field distribution of a radio-frequency antenna is measured in at least one part of a examination volume of the magnetic resonance system, and then the RF pulses emitted by the radio-frequency antenna are optimized, based on the determined B1 field distribution, for homogenization in a specific volume. An effective volume within the examination volume is determined beforehand for each applied RF pulse and, based on the determined B1 field distribution, the appertaining RF pulse is individually adjusted such that the B1 field is homogenized within the effective volume of the RF pulse.

摘要翻译： 在磁共振系统及其操作方法中，在磁共振系统的检查体积的至少一部分中测量射频天线的B 1场分布，然后RF 基于确定的B SUB场分布来优化由射频天线发射的脉冲用于在特定体积中的均匀化。 对于每个施加的RF脉冲，预先确定检查体积内的有效体积，并且基于所确定的B SUB场分布，分别调整相应的RF脉冲，使得B <1> SUB>场在RF脉冲的有效体积内均匀化。

公开(公告)号：US20050174115A1

公开(公告)日：2005-08-11

申请号：US10514388

申请日：2003-05-06

申请人： Razvan Lazar ,  Jurgen Nistler ,  Wolfgang Renz ,  Markus Vester

发明人： Razvan Lazar ,  Jurgen Nistler ,  Wolfgang Renz ,  Markus Vester

IPC分类号： G01R33/36 ,  A61B5/055 ,  G01R33/34 ,  G01R33/3415 ,  G01V3/00

CPC分类号： G01R33/3415 ,  G01R33/34046 ,  G01R33/3642 ,  G01R33/365 ,  G01R33/5659

摘要： A magnetic resonance system has a primary RF transmitting antenna and at least one secondary RF transmitting antenna. Both antennas generate RF excitation fields in an examination volume. At least one of the primary and secondary transmitting antennas has a control element connected thereto, which allows an amplitude ratio and/or a phase difference of the respective excitation currents in the antennas to be set by a control and evaluation device. The control and evaluation device causes the excitation current in the secondary transmitting antenna to have a smaller amplitude than the excitation current in the primary transmitting antenna, so that the excitation field generated by the secondary transmitting antenna has a smaller spatial extent in the examination volume than the excitation field generated by the primary transmitting antenna.

摘要翻译： 磁共振系统具有主RF发射天线和至少一个次RF发射天线。 两个天线在检查体积中产生RF激励场。 主发射天线和次发射天线中的至少一个具有连接到其上的控制元件，这允许通过控制和评估装置设置天线中的相应激励电流的振幅比和/或相位差。 控制和评估装置使得次级发射天线中的激励电流具有比主发射天线中的激励电流更小的振幅，使得由次发射天线产生的激励场在检查体积中具有较小的空间范围， 由主发射天线产生的激励场。

公开(公告)号：US6157193A

公开(公告)日：2000-12-05

申请号：US195488

申请日：1998-11-18

申请人： Wolfgang Renz ,  Markus Vester

发明人： Wolfgang Renz ,  Markus Vester

IPC分类号： A61B5/055 ,  G01R33/341 ,  G01R33/36 ,  G01V3/00

CPC分类号： G01R33/3642 ,  A61B5/055 ,  G01R33/341

摘要： An MR imaging system with an electrically insulated coil element includes at least one first coil element which is electrically connected to an electronic unit and at least one electrically completely insulated second coil element which is magnetically coupled to the first coil element. Operative interventions in a region to be examined are possible through a free access area. The sterility that is necessary during operations is ensured by a device for shielding from germs.

摘要翻译： 具有电绝缘线圈元件的MR成像系统包括电连接到电子单元的至少一个第一线圈元件和与第一线圈元件磁耦合的至少一个电完全绝缘的第二线圈元件。 通过自由进入区域，可以对待审查地区进行行动干预。 通过用于屏蔽细菌的装置来确保操作期间必需的不育。

公开(公告)号：US5473252A

公开(公告)日：1995-12-05

申请号：US248992

申请日：1994-05-25

申请人： Wolfgang Renz ,  Markus Vester

发明人： Wolfgang Renz ,  Markus Vester

IPC分类号： A61B5/055 ,  G01R33/36 ,  G01R33/28

CPC分类号： G01R33/3692 ,  G01R33/3642

摘要： A high-frequency apparatus for nuclear spin tomography includes a high-frequency transmitter for exciting nuclear spin in a body to be imaged and a high-frequency receiver for detecting B-field components resulting from the nuclear spin. The high-frequency receiver includes a galvanically-separated local coil device having two antenna loops between which an amplifier unit is connected. The local coil device radiates new B-field components in response to the original B-field components caused by the nuclear spin excitation, with the new B-field components oriented substantially orthogonal to the original B-field components. The new B-field components are then received by an external receiving antenna for subsequent signal processing, ultimately resulting in an image of the body.

摘要翻译： 用于核自旋断层摄影的高频装置包括用于激发要成像的体内的核自旋的高频发射器和用于检测由核旋转产生的B场成分的高频接收器。 高频接收机包括电流分离的本地线圈装置，其具有连接放大器单元的两个天线回路。 本地线圈装置响应于由核自旋激励引起的原始B场分量而辐射新的B场分量，新的B场分量基本上与原始B场分量正交。 然后，新的B场分量由外部接收天线接收，用于随后的信号处理，最终导致身体的图像。

公开(公告)号：US09989603B2

公开(公告)日：2018-06-05

申请号：US14468937

申请日：2014-08-26

申请人： Wolfgang Renz ,  Markus Vester

发明人： Wolfgang Renz ,  Markus Vester

IPC分类号： G01R33/36 ,  G01R33/28

CPC分类号： G01R33/36 ,  G01R33/288 ,  G01R33/3607 ,  G01R33/3635 ,  G01R33/3678

摘要： The embodiments relate to a method, an MRI device, and a circuit for a magnetic resonance imaging device that includes at least one transmission coil for transmitting a magnetic field. The circuit includes a hybrid coupler and at least one phase shifter arranged in the transmission path between an amplifier and at least one transmission coil of the magnetic resonance imaging device.

公开(公告)号：US20090179645A1

公开(公告)日：2009-07-16

申请号：US12353292

申请日：2009-01-14

申请人： Dirk Diehl ,  Juergen Nistler ,  Wolfgang Renz ,  Markus Vester ,  Sebastian Wolf

发明人： Dirk Diehl ,  Juergen Nistler ,  Wolfgang Renz ,  Markus Vester ,  Sebastian Wolf

IPC分类号： G01R33/28

CPC分类号： G01R33/3415 ,  G01R33/288 ,  G01R33/5612 ,  G01R33/5659

摘要： A control device for a magnetic resonance system activates the coils of a transmission array and a gradient magnet system of the magnetic resonance system by causing an excitation pulse to be supplied to each coil. A magnetization that exhibits a first actual inhomogeneity thereby is generated in an excitation volume of the magnetic resonance system. The control device determines the excitation pulse for each coil using a start pulse and a maximum allowable inhomogeneity. The respective start pulse has a total time duration. When the control device activates the coils of the transmission array and of the gradient magnet system corresponding to the start pulse, a magnetization that exhibits a second actual inhomogeneity that is smaller than the maximum permissible inhomogeneity is generated in the excitation volume. The control device determines an intermediate point of the start pulse so that the respective start pulse is divided into a first pulse part and a second pulse part that is complementary to the first pulse part. The first pulse part corresponds to a respective low-energy portion of the start pulse, the second pulse part with a high-energy portion of the respective start pulse. The control device temporally extends the second pulse part and correspondingly compresses the second pulse part in terms of amplitude. The temporally extended and amplitude-compressed pulse part is used as the excitation pulse. The control device determines the intermediate point such that the first inhomogeneity is still smaller than the maximum allowable inhomogeneity.

摘要翻译： 用于磁共振系统的控制装置通过使激励脉冲提供给每个线圈来激活磁共振系统的传输阵列的线圈和梯度磁体系统。 在磁共振系统的激励体积中产生呈现出第一实际不均匀性的磁化。 控制装置使用起始脉冲和最大允许不均匀性来确定每个线圈的激励脉冲。 相应的起始脉冲具有总持续时间。 当控制装置激活与起始脉冲相对应的传输阵列和梯度磁体系统的线圈时，在激励体积中产生表现出小于最大允许不均匀性的第二实际不均匀性的磁化。 控制装置确定起始脉冲的中间点，使得各个起始脉冲被分成与第一脉冲部分互补的第一脉冲部分和第二脉冲部分。 第一脉冲部分对应于起始脉冲的相应低能部分，第二脉冲部分具有相应起始脉冲的高能部分。 控制装置暂时地延伸第二脉冲部分并相应地按照幅度压缩第二脉冲部分。 时间延长和幅度压缩的脉冲部分被用作激励脉冲。 控制装置确定中间点，使得第一不均匀性仍然小于最大允许不均匀性。

公开(公告)号：US07501823B2

公开(公告)日：2009-03-10

申请号：US11737214

申请日：2007-04-19

申请人： Juergen Nistler ,  Wolfgang Renz ,  Markus Vester

发明人： Juergen Nistler ,  Wolfgang Renz ,  Markus Vester

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/34076 ,  G01R33/3415 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/3685 ,  G01R33/422 ,  G01R33/5659

摘要： A cylindrical magnetic resonance antenna suitable for use as a local antenna for the reception or transmission of magnetic resonance signals, has an antenna arrangement, such as a birdcage antenna arrangement with longitudinal conductors connected at their opposite ends by end rings. In each case, two adjacent longitudinal conductors and the end ring segments therebetween form a network. In each case, the end ring segments connecting two of the adjacent longitudinal conductors are formed as end ring sections, with an end ring capacitance connected therebetween, which is the same for all of the end ring segments. A grounded screen externally encompasses the antenna arrangement. The grounded screen is composed of electrically conductive material and is coupled through a screen capacitance to the longitudinal conductors and the end rings. The longitudinal conductors are each formed by conductor sections connected with a longitudinal capacitance therebetween, which is the same for all of the longitudinal conductors. The longitudinal capacitance, the end ring capacitance, and the screen capacitance are dimensioned so that the magnetic resonance antenna always has the same resonance frequency regardless of the type of activation thereof.

摘要翻译： 适合用作接收或传输磁共振信号的本地天线的圆柱形磁共振天线具有天线布置，例如鸟笼天线装置，其纵向导体在其相对端通过端环连接。 在每种情况下，两个相邻的纵向导体和其间的端环段形成网络。 在每种情况下，连接两个相邻的纵向导体的端环段形成为端环部分，端环电容连接在它们之间，对于所有端环段是相同的。 外部接地屏幕包括天线装置。 接地屏幕由导电材料组成，并通过屏蔽电容耦合到纵向导体和端环。 纵向导体各自由与其间的纵向电容连接的导体部分形成，这对于所有纵向导体是相同的。 纵向电容，端环电容和屏幕电容的尺寸使得磁共振天线始终具有相同的谐振频率，而与其激活类型无关。

公开(公告)号：US20070247158A1

公开(公告)日：2007-10-25

申请号：US11737214

申请日：2007-04-19

申请人： Juergen Nistler ,  Wolfgang Renz ,  Markus Vester

发明人： Juergen Nistler ,  Wolfgang Renz ,  Markus Vester

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/34076 ,  G01R33/3415 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/3685 ,  G01R33/422 ,  G01R33/5659

摘要： A cylindrical magnetic resonance antenna suitable for use as a local antenna for the reception or transmission of magnetic resonance signals, has an antenna arrangement, such as a birdcage antenna arrangement with longitudinal conductors connected at their opposite ends by end rings. In each case, two adjacent longitudinal conductors and the end ring segments therebetween form a network. In each case, the end ring segments connecting two of the adjacent longitudinal conductors are formed as end ring sections, with an end ring capacitance connected therebetween, which is the same for all of the end ring segments. A grounded screen externally encompasses the antenna arrangement. The grounded screen is composed of electrically conductive material and is coupled through a screen capacitance to the longitudinal conductors and the end rings. The longitudinal conductors are each formed by conductor sections connected with a longitudinal capacitance therebetween, which is the same for all of the longitudinal conductors. The longitudinal capacitance, the end ring capacitance, and the screen capacitance are dimensioned so that the magnetic resonance antenna always has the same resonance frequency regardless of the type of activation thereof.

摘要翻译： 适合用作接收或传输磁共振信号的本地天线的圆柱形磁共振天线具有天线布置，例如鸟笼天线装置，其纵向导体在其相对端通过端环连接。 在每种情况下，两个相邻的纵向导体和其间的端环段形成网络。 在每种情况下，连接两个相邻的纵向导体的端环段形成为端环部分，端环电容连接在它们之间，对于所有端环段是相同的。 外部接地屏幕包括天线装置。 接地屏幕由导电材料组成，并通过屏蔽电容耦合到纵向导体和端环。 纵向导体各自由与其间的纵向电容连接的导体部分形成，这对于所有纵向导体是相同的。 纵向电容，端环电容和屏幕电容的尺寸使得磁共振天线始终具有相同的谐振频率，而与其激活类型无关。

公开(公告)号：US07230427B2

公开(公告)日：2007-06-12

申请号：US11208185

申请日：2005-08-18

申请人： Ralph Kimmlingen ,  Razvan Lazar ,  Jürgen Nistler ,  Wolfgang Renz ,  Markus Vester

发明人： Ralph Kimmlingen ,  Razvan Lazar ,  Jürgen Nistler ,  Wolfgang Renz ,  Markus Vester

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/385 ,  G01R33/422

摘要： A magnetic resonance apparatus has an RF antenna unit, a gradient coil unit and an RF shield, the conductor structures of which are independent of one another. The RF shield is arranged between the RF antenna unit and the gradient coil unit, a first RF field return volume is arranged between RF the antenna unit (1, 29, 55A, and the gradient coil unit, the RF field return volume closes RF magnetic field lines of the RF antenna unit and is bordered by the RF shield on the side of the gradient coil unit. The conductor structure of the gradient coil unit occupies a first region. A second conductor-free region is within the first region, on the side facing the RF antenna unit, between a primary gradient coil unit and a secondary shim gradient coil unit of the gradient coil unit. The second conductor-free region is at least partially surrounded by the conductor structure of the gradient coil unit and is fashioned as a second RF field return volume in connection with the first RF field return volume. The RF shield proceeds between the RF field return volumes and the conductor structure of the gradient coil unit. The RF antenna unit is closer to the data acquisition region of the magnetic resonance apparatus than the gradient coil unit.

摘要翻译： 磁共振装置具有RF天线单元，梯度线圈单元和RF屏蔽，其导体结构彼此独立。 RF屏蔽设置在RF天线单元和梯度线圈单元之间，RF天线单元（1,29,55A和梯度线圈单元之间）之间布置第一RF场返回音量，RF场返回音量关闭RF RF天线单元的磁场线，并且由梯形线圈单元侧的RF屏蔽界定，梯度线圈单元的导体结构占据第一区域，第二无导体区域在第一区域内，在 面向RF天线单元的一侧，梯度线圈单元的主梯度线圈单元和次级斜面梯形线圈单元之间，第二无导体区域至少部分地被梯度线圈单元的导体结构包围，并被形成 作为与第一RF场返回体积相关的第二RF场返回体积，RF屏蔽在RF场返回体积和梯度线圈单元的导体结构之间进行，RF天线单元更靠近 e数据采集区域比梯形线圈单元。