专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

US20120326721A1 SIMULTANEOUS AND DYNAMIC DETERMINATION OF LONGITUDINAL AND TRANSVERSAL RELAXATION TIMES OF A NUCLEAR SPIN SYSTEM 有权
标题翻译：核弹簧系统的纵向和横向松弛时间的同时和动态确定
公开(公告)号：US20120326721A1
公开(公告)日：2012-12-27
申请号：US13582800
申请日：2011-03-10
申请人： Stefanie Remmele , Wei Liu , Tobias Ratko Voigt , Christian Stehning
发明人： Stefanie Remmele , Wei Liu , Tobias Ratko Voigt , Christian Stehning
IPC分类号： G01R33/56 , G01R33/34
CPC分类号： G01R33/50 , G01R33/5601 , G01R33/5613 , G01R33/5616
摘要： The invention relates to a magnetic resonance imaging method for simultaneous and dynamic determination of a longitudinal relaxation time T1 and a transversal relaxation time T2 of the nuclear spin system of an object, in the context of DCE or DSE MRI. In this respect, the invention makes use of a steady-state gradient echo pulse sequence comprising an EPI readout module.
摘要翻译：本发明涉及一种用于在DCE或DSE MRI的背景下同时和动态地确定物体的核自旋系统的纵向弛豫时间T1和横向弛豫时间T2的磁共振成像方法。在这方面，本发明利用包括EPI读出模块的稳态梯度回波脉冲序列。

2. 发明授权

US09588205B2 Simultaneous and dynamic determination of longitudinal and transversal relaxation times of a nuclear spin system 有权
标题翻译：同时和动态地确定核自旋系统的纵向和横向弛豫时间
公开(公告)号：US09588205B2
公开(公告)日：2017-03-07
申请号：US13582800
申请日：2011-03-10
申请人： Stefanie Remmele , Wei Liu , Tobias Ratko Voigt , Christian Stehning
发明人： Stefanie Remmele , Wei Liu , Tobias Ratko Voigt , Christian Stehning
IPC分类号： G01R33/50 , G01R33/56 , G01R33/561
CPC分类号： G01R33/50 , G01R33/5601 , G01R33/5613 , G01R33/5616
摘要： The invention relates to a magnetic resonance imaging method for simultaneous and dynamic determination of a longitudinal relaxation time T1 and a transversal relaxation time T2 of the nuclear spin system of an object, in the context of DCE or DSE MRI. In this respect, the invention makes use of a steady-state gradient echo pulse sequence comprising an EPI readout module.
摘要翻译：本发明涉及一种用于在DCE或DSE MRI的背景下同时和动态地确定物体的核自旋系统的纵向弛豫时间T1和横向弛豫时间T2的磁共振成像方法。在这方面，本发明利用包括EPI读出模块的稳态梯度回波脉冲序列。

3. 发明申请

US20120306493A1 ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM 有权
标题翻译：电性质地图成像方法与系统
公开(公告)号：US20120306493A1
公开(公告)日：2012-12-06
申请号：US13522367
申请日：2011-01-13
申请人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
发明人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
IPC分类号： G01R33/54 , G01R33/341
CPC分类号： G01R33/48 , A61B5/0536 , A61B5/055 , G01R33/246 , G01R33/443
摘要： The invention relates to a magnetic resonance method of electric properties tomography imaging of an object, the method comprising: applying an excitation RF field to the object via a coil at a first spatial coil position (402), acquiring resulting magnetic resonance signals via a receiving channel from the object, determining from the acquired magnetic resonance signals a first phase distribution and a first amplitude of a given magnetic field component of the excitation RF field of the coil at the first coil position (402), repeating these steps with a coil at a second different spatial coil position (404), to obtain a second phase distribution, determining a phase difference between the first and second phase distribution, determining a first and a second complex permittivity of the object, the first complex permittivity comprising the first amplitude of the given magnetic field component and the second complex permittivity comprising the second amplitude of the given magnetic field component and the phase difference, equating the first complex permittivity and the second complex permittivity for receiving a final equation and determining from the final equation a phase of the given magnetic field component for the first coil position (402).
摘要翻译：本发明涉及一种物体的电性能断层摄影成像的磁共振方法，该方法包括：经由第一空间线圈位置（402）的线圈将激发RF场施加到物体，经由接收器获得产生的磁共振信号从所述对象中确定所述线圈在所述第一线圈位置（402）处的所述磁共振信号的第一相位分布和所述线圈的激励RF场的给定磁场分量的第一幅度，并将线圈重复这些步骤第二不同的空间线圈位置（404），以获得第二相位分布，确定所述第一和第二相位分布之间的相位差，确定所述对象的第一和第二复介电常数，所述第一复介电常数包括所述第一和第二相位分布的第一幅度给定的磁场分量和包括给定磁场的第二振幅的第二复数介电常数分量和相位差，将第一复数介电常数和第二复数介电常数相等以接收最终方程，并从最终方程确定用于第一线圈位置（402）的给定磁场分量的相位。

4. 发明授权

US09638777B2 Electric properties tomography imaging method and system 有权
公开(公告)号：US09638777B2
公开(公告)日：2017-05-02
申请号：US13522367
申请日：2011-01-13
申请人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
发明人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
IPC分类号： G01R33/54 , G01R33/341 , G01R33/48 , A61B5/053 , A61B5/055 , G01R33/24 , G01R33/44
CPC分类号： G01R33/48 , A61B5/0536 , A61B5/055 , G01R33/246 , G01R33/443
摘要： A magnetic resonance method of electric properties tomography imaging of an object includes applying an excitation RF field to the object via a coil at a first spatial coil position (402), acquiring resulting magnetic resonance signals via a receiving channel from the object, determining from the acquired magnetic resonance signals a first phase distribution and a first amplitude of a given magnetic field component of the excitation RF field of the coil at the first coil position (402), repeating these steps with a coil at a second different spatial coil position (404), to obtain a second phase distribution, determining a phase difference between the first and second phase distribution, determining a first and a second complex permittivity of the object, the first complex permittivity comprising the first amplitude of the given magnetic field component and the second complex permittivity comprising the second amplitude of the given magnetic field component and the phase difference, equating the first complex permittivity and the second complex permittivity for receiving a final equation and determining from the final equation a phase of the given magnetic field component for the first coil position (402).

5. 发明授权

US08698495B2 Flip angle imaging with improved B1 mapping for multi-RF transmit systems 有权
标题翻译：用于多射频发射系统的改进B1映射的倒角成像
公开(公告)号：US08698495B2
公开(公告)日：2014-04-15
申请号：US12933897
申请日：2009-03-26
申请人： Kay Nehrke , Peter Boernert , Tobias Ratko Voigt , Ulrich Katscher
发明人： Kay Nehrke , Peter Boernert , Tobias Ratko Voigt , Ulrich Katscher
IPC分类号： G01V3/00
CPC分类号： G01R33/586 , G01R33/246 , G01R33/3415 , G01R33/5612 , G01R33/56518 , G01R33/5659
摘要： A magnetic resonance method includes performing a plurality of magnetic resonance excitation operations each using a different sub-set of a set of radio frequency transmit coils (30), each sub-set including more than one radio frequency transmit coil, acquiring magnetic resonance data responsive to each said magnetic resonance excitation operation, and computing a B1 or flip angle map for each radio frequency transmit coil of the set of radio frequency transmit coils based on the acquired magnetic resonance data. A magnetic resonance method includes performing an actual flip angle mapping (AFI) sequence using a radio frequency transmit coil (32) with a ratio TR1:TR2 of the TR times of the AFI sequence selected to be rational, acquiring magnetic resonance data responsive to said AFI sequence, and computing a B1 or flip angle map for the radio frequency transmit coil based on the acquired magnetic resonance data.
摘要翻译：磁共振方法包括使用一组射频发射线圈（30）的不同子集执行多个磁共振激励操作，每个子集包括多于一个射频发射线圈，响应于磁共振数据到每个所述磁共振激励操作，以及基于所获取的磁共振数据计算所述射频发射线圈组中的每个射频发射线圈的B1或翻角图。磁共振方法包括使用射频发射线圈（32）执行实际的翻转角映射（AFI）序列，其中AFI序列的TR次的比值TR1：TR2被选择为合理，获取响应于所述的 AFI序列，并且基于获取的磁共振数据计算用于射频发射线圈的B1或翻转角图。

6. 发明授权

US09702950B2 Reducing the radio-frequency transmit field in a predetermined volume during magnetic resonance imaging 有权
公开(公告)号：US09702950B2
公开(公告)日：2017-07-11
申请号：US14238999
申请日：2012-08-15
申请人： Hanno Heyke Homann , Ingmar Graesslin , Ulrich Katscher , Tobias Ratko Voigt , Olaf Helmut Dössel , Sebastian Alfred Seitz
发明人： Hanno Heyke Homann , Ingmar Graesslin , Ulrich Katscher , Tobias Ratko Voigt , Olaf Helmut Dössel , Sebastian Alfred Seitz
IPC分类号： G01R33/28 , G01R33/36 , G01R33/561
CPC分类号： G01R33/36 , G01R33/285 , G01R33/288 , G01R33/5612
摘要： A magnetic resonance imaging system (300) acquires magnetic resonance data (358) from a subject (318) that may include an electrically conductive object (e.g. an implant or a medical device). The magnetic resonance imaging system includes a radio-frequency transmitter (314) for generating a radio-frequency transmit field for acquiring the magnetic resonance data using a radio-frequency antenna (310). The radio-frequency transmitter has multiple transmit channels. The radio-frequency antenna comprises multiple antenna elements (312) each adapted to connect to an antenna element. The amplitude and phase values of the RF transmit field of each of the transmit channels can be selected such that the magnetic field generated by the RF antenna is minimized at the location of the electrically conductive object, thereby reducing RF heating of the object.

7. 发明授权

US09229074B2 Method for calculating local specific energy absorption rate (SAR) in nuclear magnetic resonance 有权
标题翻译：计算核磁共振中局部比吸收率（SAR）的方法
公开(公告)号：US09229074B2
公开(公告)日：2016-01-05
申请号：US13514611
申请日：2010-12-28
申请人： Tobias Ratko Voigt , Ulrich Katscher , Hanno Heyke Homann
发明人： Tobias Ratko Voigt , Ulrich Katscher , Hanno Heyke Homann
IPC分类号： G01R33/28 , G01R33/24 , G01R33/44 , G01R33/54 , G01R33/56
CPC分类号： G01R33/288 , G01R33/246 , G01R33/443 , G01R33/543 , G01R33/546 , G01R33/5608
摘要： A method and system for calculating a local specific energy absorption rate (SAR) is based on an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan, such as a B1 mapping method.
摘要翻译：用于计算局部比能吸收率（SAR）的方法和系统基于电参数和物体的分段几何形状的质量密度和射频（RF）天线的磁场矢量分布）。电参数和质量密度的值是预定值，而通过基于诸如B1映射方法的磁共振（MR）扫描的磁场映射方法来估计磁场矢量分布。

8. 发明申请

US20120139541A1 DETERMINATION OF LOCAL SAR IN VIVO AND ELECTRICAL CONDUCTIVITY MAPPING 审中-公开
标题翻译：局部SAR在血液和电导率测绘中的测定
公开(公告)号：US20120139541A1
公开(公告)日：2012-06-07
申请号：US12933894
申请日：2009-03-25
申请人： Steffen Weiss , Ulrich Katscher , Peter Vernickel , Tobias Ratko Voigt , Christian Findeklee
发明人： Steffen Weiss , Ulrich Katscher , Peter Vernickel , Tobias Ratko Voigt , Christian Findeklee
IPC分类号： G01R33/44
CPC分类号： G01R33/583 , A61B5/055 , G01R33/288
摘要： A magnetic resonance imaging apparatus produces calculations of local specific energy absorption rates (SAR) by calculating an electrical permittivity map of a subject. The electric permittivity is calculated by measuring the components of the B1 field induced by a radio frequency (RF) coil (16). The Hx and Hy components of the B1 field can be directly measured. The Hz component is measured by encoding it into the phase of the resonance signals. Alternately, Hz can be calculated by solving Gauss's law for magnetism. Hz can also be estimated by finding the z component of the electric field. In the specific case of a birdcage RF coil, Hz can be estimated by using a model of the RF coil and a subject, a model of the RF coil alone, or setting Hz to a constant.
摘要翻译：磁共振成像装置通过计算受试者的电容率图来产生局部比能吸收率（SAR）的计算。通过测量由射频（RF）线圈（16）感应的B1场的分量来计算电容率。可以直接测量B1场的Hx和Hy分量。通过对谐振信号的相位进行编码来测量Hz分量。或者，可以通过求解磁性的高斯定律来计算Hz。 Hz也可以通过找到电场的z分量来估计。在鸟笼RF线圈的具体情况下，可以通过使用RF线圈和对象的模型，单独的RF线圈的模型或将Hz设置为常数来估计Hz。

9. 发明申请

US20110026799A1 FLIP ANGLE IMAGING WITH IMPROVED B1 MAPPING FOR MULTI-RF TRANSMIT SYSTEMS 有权
标题翻译：具有改进的用于多射频发射系统的B1映射的翻转角成像
公开(公告)号：US20110026799A1
公开(公告)日：2011-02-03
申请号：US12933897
申请日：2009-03-26
申请人： Kay Nehrke , Peter Boernert , Tobias Ratko Voigt , Ulrich Katscher
发明人： Kay Nehrke , Peter Boernert , Tobias Ratko Voigt , Ulrich Katscher
IPC分类号： G06K9/00
CPC分类号： G01R33/586 , G01R33/246 , G01R33/3415 , G01R33/5612 , G01R33/56518 , G01R33/5659
摘要： A magnetic resonance method includes performing a plurality of magnetic resonance excitation operations each using a different sub-set of a set of radio frequency transmit coils (30), each sub-set including more than one radio frequency transmit coil, acquiring magnetic resonance data responsive to each said magnetic resonance excitation operation, and computing a B1 or flip angle map for each radio frequency transmit coil of the set of radio frequency transmit coils based on the acquired magnetic resonance data. A magnetic resonance method includes performing an actual flip angle mapping (AFI) sequence using a radio frequency transmit coil (32) with a ratio TR1:TR2 of the TR times of the AFI sequence selected to be rational, acquiring magnetic resonance data responsive to said AFI sequence, and computing a B1 or flip angle map for the radio frequency transmit coil based on the acquired magnetic resonance data.
摘要翻译：磁共振方法包括使用一组射频发射线圈（30）的不同子集执行多个磁共振激励操作，每个子集包括多于一个射频发射线圈，响应于磁共振数据到每个所述磁共振激励操作，以及基于所获取的磁共振数据计算所述射频发射线圈组中的每个射频发射线圈的B1或翻角图。磁共振方法包括使用射频发射线圈（32）执行实际的翻转角映射（AFI）序列，其中AFI序列的TR次的比值TR1：TR2被选择为合理，获取响应于所述的 AFI序列，并且基于获取的磁共振数据计算用于射频发射线圈的B1或翻转角图。

10. 发明申请

US20140210472A1 REDUCING THE RADIO-FREQUENCY TRANSMIT FIELD IN A PREDETERMINED VOLUME DURING MAGNETIC RESONANCE IMAGING 有权
标题翻译：在磁共振成像期间减少预测体积中的无线电频率发射
公开(公告)号：US20140210472A1
公开(公告)日：2014-07-31
申请号：US14238999
申请日：2012-08-15
申请人： Hanno Heyke Homann , Ingmar Graesslin , Ulrich Katscher , Tobias Ratko Voigt , Olaf Helmut Dössel , Sebastian Alfred Seitz
发明人： Hanno Heyke Homann , Ingmar Graesslin , Ulrich Katscher , Tobias Ratko Voigt , Olaf Helmut Dössel , Sebastian Alfred Seitz
IPC分类号： G01R33/36
CPC分类号： G01R33/36 , G01R33/285 , G01R33/288 , G01R33/5612
摘要： Embodiments of the invention relate to a magnetic resonance imaging system (300) for acquiring magnetic resonance data (358) from a subject (318) that may comprise an electrically conductive object (e.g. an implant or a medical device). The magnetic resonance imaging system comprises a radio-frequency transmitter (314) for generating a radio-frequency transmit field for acquiring the magnetic resonance data using a radio-frequency antenna (310). The radio-frequency transmitter has multiple transmit channels. The radio-frequency antenna comprises multiple antenna elements (312) each adapted to connect to an antenna element. According to an embodiment of the invention, the amplitude and phase values of the RF transmit field of each of the transmit channels are selected such that the magnetic field generated by the RF antenna is minimized at the location of the electrically conductive object, thereby reducing RF heating of the object.
摘要翻译：本发明的实施例涉及一种用于从可能包括导电物体（例如植入物或医疗装置）的被摄体（318）获取磁共振数据（358）的磁共振成像系统（300）。磁共振成像系统包括用于使用射频天线（310）产生用于获取磁共振数据的射频发射场的射频发射机（314）。射频发射机具有多个发射信道。射频天线包括各自适于连接到天线元件的多个天线元件（312）。根据本发明的实施例，选择每个发射信道的RF发射场的幅度和相位值，使得由RF天线产生的磁场在导电物体的位置处最小化，从而减少RF 加热物体。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式