公开(公告)号：US07634303B2

公开(公告)日：2009-12-15

申请号：US11768531

申请日：2007-06-26

申请人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jürgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schön

发明人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jürgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schön

IPC分类号： A61B5/05 ,  G01V3/00 ,  B23P17/04

CPC分类号： G01R33/28 ,  G01R33/34 ,  G01R33/5659 ,  Y10T29/49

摘要： A dielectric element is formed of a dielectric material exhibiting a magnetic resonance relaxation time, with a relaxation agent incorporated in the dielectric material that reduces the relaxation time of the dielectric material. The dielectric element is adapted for placement on a subject while magnetic resonance data are acquired from the subject, and locally influences the B1 field distribution in the subject during the acquisition of magnetic resonance data.

摘要翻译： 电介质元件由表现出磁共振弛豫时间的电介质材料形成，并且电介质材料中包含减轻电介质材料弛豫时间的松弛剂。 介电元件适于放置在被摄体上，同时从受检者获取磁共振数据，并且在获取磁共振数据期间局部影响对象中的B1场分布。

公开(公告)号：US07492156B2

公开(公告)日：2009-02-17

申请号：US11095159

申请日：2005-03-31

申请人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jürgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schön

发明人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jürgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schön

IPC分类号： G01V3/00 ,  A61B5/00

CPC分类号： G01R33/28 ,  G01R33/34 ,  G01R33/5659 ,  Y10T29/49

摘要： A dielectric element is formed of a dielectric material exhibiting a magnetic resonance relaxation time, with a relaxation agent incorporated in the dielectric material that reduces the relaxation time of the dielectric material. The dielectric element is adapted for placement on a subject while magnetic resonance data are acquired from the subject, and locally influences the B1 field distribution in the subject during the acquisition of magnetic resonance data.

公开(公告)号：US20050245816A1

公开(公告)日：2005-11-03

申请号：US11095159

申请日：2005-03-31

申请人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jurgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schon

发明人： Yvonne Candidus ,  Thorsten Feiweier ,  Wilhelm Horger ,  Jurgen Huber ,  Razvan Lazar ,  Melanie Schmitt ,  Lothar Schon

IPC分类号： A61B5/05 ,  A61B5/055 ,  G01R33/28 ,  G01R33/30 ,  G01R33/34 ,  G01R33/341

CPC分类号： G01R33/28 ,  G01R33/34 ,  G01R33/5659 ,  Y10T29/49

摘要： A dielectric element is formed of a dielectric material exhibiting a magnetic resonance relaxation time, with a relaxation agent incorporated in the dielectric material that reduces the relaxation time of the dielectric material. The dielectric element is adapted for placement on a subject while magnetic resonance data are acquired from the subject, and locally influences the B1 field distribution in the subject during the acquisition of magnetic resonance data.

摘要翻译： 电介质元件由表现出磁共振弛豫时间的电介质材料形成，并且电介质材料中包含减轻电介质材料弛豫时间的松弛剂。 当从对象获取磁共振数据时，介电元件适于放置在被摄体上，并且在获取磁共振数据期间局部地影响对象中的B 1场分布。

公开(公告)号：US07432713B2

公开(公告)日：2008-10-07

申请号：US11756780

申请日：2007-06-01

申请人： Yvonne Candidus ,  Thorsten Feiweier ,  Jürgen Huber ,  Lothar Schön ,  Thorsten Speckner

发明人： Yvonne Candidus ,  Thorsten Feiweier ,  Jürgen Huber ,  Lothar Schön ,  Thorsten Speckner

IPC分类号： G01V3/00

CPC分类号： G01R33/28 ,  G01R33/5659

摘要： A dielectric element for positioning on an examination subject for locally influencing the B1 field distribution during magnetic resonance data acquisition contains a relaxation agent bound to mutually separated particles. The relaxation agent incorporates a paramagnetic substance. In a corresponding method for acquiring magnetic resonance data from an examination subject, such a dielectric element is positioned on the examination subject for locally influencing the B1 field distribution, by homogenizing the B1 field of a magnetic resonance apparatus.

摘要翻译： 用于定位在检查对象上用于在磁共振数据采集期间局部影响B1场分布的电介质元件包含与相互分离的颗粒结合的松弛剂。 松弛剂包含顺磁性物质。 在用于从检查对象获取磁共振数据的相应方法中，这样的电介质元件位于检查对象上，用于局部影响B 1场分布，通过使B＆lt; 1＆ 磁共振装置。

公开(公告)号：US07002347B2

公开(公告)日：2006-02-21

申请号：US10953303

申请日：2004-09-29

申请人： Thorsten Feiweier ,  Razvan Lazar ,  Wolfgang Renz ,  Lothar Schön

发明人： Thorsten Feiweier ,  Razvan Lazar ,  Wolfgang Renz ,  Lothar Schön

IPC分类号： G01V3/00

CPC分类号： G01R33/341

摘要： A local coil unit for a magnetic resonance apparatus, which radiates a radio-frequency field into an examination subject, has a housing and at least a part of the housing is formed of an insulating dielectric material that passively compensates for an inhomogeneity in the high-frequency field in the subject. The material has a relative dielectric value εr of greater than 50, preferably greater than 100, and a dielectric loss factor tan δ of less than 2.5×10−2, preferably less than 1×10−3. In the dielectric material displacement currents are generated which create an additional magnetic field that compensates for the minima in the B1 field as a result of the eddy currents arising in the patient due to the radio-frequency radiation.

摘要翻译： 用于将射频场辐射到检查对象中的磁共振设备的局部线圈单元具有壳体，并且壳体的至少一部分由绝缘电介质材料形成，被动地补偿高频场中的不均匀性， 频率场。 该材料具有大于50，优选大于100的相对电介质值εL r以及低于2.5×10 -2的介电损耗因子tanδ，优​​选地较小 超过1×10 -3 -3。 在电介质材料中，产生位移电流，其产生额外的磁场，其由于射频辐射而在患者体内产生的涡流的结果来补偿B1场中的最小值。

公开(公告)号：US20070279054A1

公开(公告)日：2007-12-06

申请号：US11756780

申请日：2007-06-01

申请人： Yvonne Candidus ,  Thorsten Feiweier ,  Jurgen Huber ,  Lothar Schon ,  Thorsten Speckner

发明人： Yvonne Candidus ,  Thorsten Feiweier ,  Jurgen Huber ,  Lothar Schon ,  Thorsten Speckner

IPC分类号： G01V3/00

CPC分类号： G01R33/28 ,  G01R33/5659

摘要： A dielectric element for positioning on an examination subject for locally influencing the B1 field distribution during magnetic resonance data acquisition contains a relaxation agent bound to mutually separated particles. The relaxation agent incorporates a paramagnetic substance. In a corresponding method for acquiring magnetic resonance data from an examination subject, such a dielectric element is positioned on the examination subject for locally influencing the B1 field distribution, by homogenizing the B1 field of a magnetic resonance apparatus.

摘要翻译： 用于定位在检查对象上用于在磁共振数据采集期间局部影响B1场分布的电介质元件包含与相互分离的颗粒结合的松弛剂。 松弛剂包含顺磁性物质。 在用于从检查对象获取磁共振数据的相应方法中，这样的电介质元件位于检查对象上，用于局部影响B 1场分布，通过使B＆lt; 1＆ 磁共振装置。

公开(公告)号：US20050231203A1

公开(公告)日：2005-10-20

申请号：US11084421

申请日：2005-03-18

申请人： Thorsten Feiweier ,  Razvan Lazar

发明人： Thorsten Feiweier ,  Razvan Lazar

IPC分类号： G01R33/32 ,  G01R33/34 ,  G01R33/3415 ,  G01V3/00

CPC分类号： G01R33/5659 ,  G01R33/246 ,  G01R33/3415

摘要： In a method and magnetic resonance system for homogenization of the B1 field for a magnetic resonance data acquisition with a number of iteration steps. An iteration step includes the following sub-steps: Measurement data are acquired that represent a B1 field distribution in at least one part of the examination volume of the magnetic resonance system. A B1 homogeneity analysis based on the acquired measurement data is automatically implemented. A specific homogenization action is automatically selected from among a number of possible homogenization actions based on the B1 homogeneity analysis, or the iterative homogenization method is ended if the diagnosed homogeneity is sufficient for an intended magnetic resonance measurement. The selected homogenization action is implemented.

摘要翻译： 在用于使多个迭代步骤进行磁共振数据采集的B SUB场的均匀化的方法和磁共振系统中。 迭代步骤包括以下子步骤：在磁共振系统的检查体积的至少一部分中获取表示B 1 SUB场分布的测量数据。 基于所获取的测量数据的B 1同质性分析被自动实现。 基于B 1均质性分析，可以从许多可能的均匀化动作中自动选择特定的均质化作用，或者如果诊断的均匀性对于预期的磁共振测量是足够的，则迭代均匀化方法结束。 实施所选择的均质化动作。

公开(公告)号：US07649353B2

公开(公告)日：2010-01-19

申请号：US11508813

申请日：2006-08-22

申请人： Thorsten Feiweier ,  Razvan Lazar

发明人： Thorsten Feiweier ,  Razvan Lazar

IPC分类号： G01V3/00 ,  A61B5/055

CPC分类号： G01R33/3678 ,  G01R33/288 ,  G01R33/5612 ,  G01R33/5659

摘要： In an MR imaging method and apparatus which MR images with improved signal intensity, improved signal-noise ratio, improved contrast and improved image homogeneity can be acquired, the polarization state of the magnetic field of the RF pulses radiated into the measurement subject and of the resonance signals emitted by the measurement subject are distorted by the interaction with electrically-active materials of the measurement subject. In the transmission branch of the RF system the RF pulses emitted by a transmission coil are pre-distorted with regard to their polarization state. The sensitivity of the reception branch is optimized such that it is capable of detecting resonance signals independent of their polarization state.

摘要翻译： 在可以获得具有改善的信号强度，改善的信噪比，改善的对比度和改进的图像均匀性的MR图像的MR成像方法和装置中，辐射到测量对象中的RF脉冲的磁场的偏振态 由测量对象发射的共振信号通过与测量对象的电活性材料的相互作用而变形。 在RF系统的传输分支中，由发射线圈发射的RF脉冲关于它们的极化状态是预失真的。 接收分支的灵敏度被优化，使得它能够独立于它们的极化状态来检测谐振信号。

公开(公告)号：US20090309594A1

公开(公告)日：2009-12-17

申请号：US11508813

申请日：2006-08-22

申请人： Thorsten Feiweier ,  Razvan Lazar

发明人： Thorsten Feiweier ,  Razvan Lazar

IPC分类号： G01R33/48

CPC分类号： G01R33/3678 ,  G01R33/288 ,  G01R33/5612 ,  G01R33/5659

摘要： In an MR imaging method and apparatus which MR images with improved signal intensity, improved signal-noise ratio, improved contrast and improved image homogeneity can be acquired, the polarization state of the magnetic field of the RF pulses radiated into the measurement subject and of the resonance signals emitted by the measurement subject are distorted by the interaction with electrically-active materials of the measurement subject. In the transmission branch of the RF system the RF pulses emitted by a transmission coil are pre-distorted with regard to their polarization state. The sensitivity of the reception branch is optimized such that it is capable of detecting resonance signals independent of their polarization state.

摘要翻译： 在可以获得具有改善的信号强度，改善的信噪比，改善的对比度和改进的图像均匀性的MR图像的MR成像方法和装置中，辐射到测量对象中的RF脉冲的磁场的偏振态 由测量对象发射的共振信号通过与测量对象的电活性材料的相互作用而变形。 在RF系统的传输分支中，由发射线圈发射的RF脉冲关于它们的极化状态是预失真的。 接收分支的灵敏度被优化，使得它能够独立于它们的极化状态来检测谐振信号。

公开(公告)号：US07078901B2

公开(公告)日：2006-07-18

申请号：US11084421

申请日：2005-03-18

申请人： Thorsten Feiweier ,  Razvan Lazar

发明人： Thorsten Feiweier ,  Razvan Lazar

IPC分类号： G01V3/00

CPC分类号： G01R33/5659 ,  G01R33/246 ,  G01R33/3415

摘要： In a method and magnetic resonance system for homogenization of the B1 field for a magnetic resonance data acquisition with a number of iteration steps. An iteration step includes the following sub-steps: Measurement data are acquired that represent a B1 field distribution in at least one part of the examination volume of the magnetic resonance system. A B1 homogeneity analysis based on the acquired measurement data is automatically implemented. A specific homogenization action is automatically selected from among a number of possible homogenization actions based on the B1 homogeneity analysis, or the iterative homogenization method is ended if the diagnosed homogeneity is sufficient for an intended magnetic resonance measurement. The selected homogenization action is implemented.

摘要翻译： 在用于使多个迭代步骤进行磁共振数据采集的B SUB场的均匀化的方法和磁共振系统中。 迭代步骤包括以下子步骤：在磁共振系统的检查体积的至少一部分中获取表示B 1 SUB场分布的测量数据。 基于所获取的测量数据的B 1同质性分析被自动实现。 基于B 1均质性分析，可以从许多可能的均匀化动作中自动选择特定的均质化作用，或者如果诊断的均匀性对于预期的磁共振测量是足够的，则迭代均匀化方法结束。 实施所选择的均质化动作。