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1. 发明申请

US20110156704A1 B1-MAPPING AND B1L-SHIMMING FOR MRI 有权
标题翻译：用于MRI的B1映射和B1L-SHIMMING
公开(公告)号：US20110156704A1
公开(公告)日：2011-06-30
申请号：US13063472
申请日：2009-09-10
申请人： Peter Boernert , Peter Koken , Kay Nehrke , Ulrich Katscher , Ingmar Graesslin
发明人： Peter Boernert , Peter Koken , Kay Nehrke , Ulrich Katscher , Ingmar Graesslin
IPC分类号： G01R33/34
CPC分类号： G01R33/583 , G01R33/246 , G01R33/3415 , G01R33/4838 , G01R33/5612 , G01R33/5659 , G01R33/586
摘要： The invention relates to a method of acquiring MRI image data comprising the following steps: performing a 3-dimensional B1 mapping of a first volume using a first voxel size, selecting an MRI protocol, performing the B1-shim in accordance with the MRI protocol, performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first voxel size is larger than the second voxel size, wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume.
摘要翻译：本发明涉及一种获取MRI图像数据的方法，包括以下步骤：使用第一体素大小执行第一体积的3维B1映射，选择MRI协议，根据MRI协议执行B1-垫片，执行MRI协议以使用第二体素尺寸获取第二体积的MRI成像数据，其中所述第一体素大小大于所述第二体素大小，其中所述第一体积大于所述第二体积，并且其中所述第二体积被包含在第一卷内。

2. 发明授权

US08736265B2 B1-mapping and B1L-shimming for MRI 有权
标题翻译： B1映射和B1L-shimming用于MRI
公开(公告)号：US08736265B2
公开(公告)日：2014-05-27
申请号：US13063472
申请日：2009-09-10
申请人： Peter Boernert , Peter Koken , Kay Nehrke , Ulrich Katscher , Ingmar Graesslin
发明人： Peter Boernert , Peter Koken , Kay Nehrke , Ulrich Katscher , Ingmar Graesslin
IPC分类号： G01R33/34
CPC分类号： G01R33/583 , G01R33/246 , G01R33/3415 , G01R33/4838 , G01R33/5612 , G01R33/5659 , G01R33/586
摘要： The invention relates to a method of acquiring MRI image data comprising the following steps: performing a 3-dimensional B1 mapping of a first volume using a first voxel size, selecting an MRI protocol, performing the B1-shim in accordance with the MRI protocol, performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first voxel size is larger than the second voxel size, wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume.
摘要翻译：本发明涉及一种获取MRI图像数据的方法，包括以下步骤：使用第一体素大小执行第一体积的3维B1映射，选择MRI协议，根据MRI协议执行B1-垫片，执行MRI协议以使用第二体素尺寸获取第二体积的MRI成像数据，其中所述第一体素大小大于所述第二体素大小，其中所述第一体积大于所述第二体积，并且其中所述第二体积被包含在第一卷内。

3. 发明申请

US20110043205A1 REAL-TIME LOCAL AND GLOBAL SAR ESTIMATION FOR PATIENT SAFETY AND IMPROVED SCANNING PERFORMANCE 有权
标题翻译：实时安全性和改进扫描性能的实时局部和全球SAR估计
公开(公告)号：US20110043205A1
公开(公告)日：2011-02-24
申请号：US12936540
申请日：2009-04-13
申请人： Ingmar Graesslin , Sven Biederer , Ulrich Katscher , Ferdinand Schweser , Peter Boernert , Paul Royston Harvey , Wilhelmus Reinerius Maria Mens
发明人： Ingmar Graesslin , Sven Biederer , Ulrich Katscher , Ferdinand Schweser , Peter Boernert , Paul Royston Harvey , Wilhelmus Reinerius Maria Mens
IPC分类号： G01R33/44
CPC分类号： G01R33/583 , G01R33/288 , G01R33/5612 , G01R33/5659
摘要： In a method and apparatus to enable increased RF duty cycle in high field MR scans, a specific energy absorption rate (SAR) calculation processor (36) calculates the local and global SAR or even a spatial SAR map. The efficient implementation by using pre-averaged data (based on E-fields) makes a fast and accurate SAR estimation possible. By incorporating additional information as e.g. patient position the SAR calculation accuracy can be increased as well as by using more patient specific precalculated information (e.g. based on different bio meshes), the so called Q-matrices. Optionally, a sequence controller (24) creates a global SAR optimal RF pulse. After the optimal RF pulse is applied, the SAR and its spatial distribution are determined. SAR hotspots are also determined. Q-matrices within an appropriate radius around the hotspots are averaged and added to a global Q-matrix in a weighted fashion. After the global Q-matrix is updated, a new optimal RF pulse is created. One or more of the steps can be repeated to converge the SAR to a minimum.
摘要翻译：在能够在高场MR扫描中增加RF占空比的方法和装置中，比能量吸收率（SAR）计算处理器（36）计算局部和全局SAR或甚至空间SAR图。通过使用预平均数据（基于电场）的有效实现使得可以进行快速和准确的SAR估计。通过结合附加信息，例如。患者位置可以增加SAR计算精度，以及通过使用更多的患者特定的预先计算的信息（例如，基于不同的生物网格），即所谓的Q矩阵。可选地，序列控制器（24）创建全局SAR最优RF脉冲。在施加最佳RF脉冲之后，确定SAR及其空间分布。 SAR热点也是决定的。在热点周围的适当半径内的Q矩阵被平均，并以加权的方式加到全局Q矩阵上。在更新全局Q矩阵之后，创建一个新的最优RF脉冲。可以重复一个或多个步骤以将SAR收敛到最小。

4. 发明申请

US20100141259A1 METHOD AND RF TRANSMITTER ARRANGEMENT FOR GENERATING RF FIELDS 有权
标题翻译：用于生成射频信号的方法和射频发射机装置
公开(公告)号：US20100141259A1
公开(公告)日：2010-06-10
申请号：US12598451
申请日：2008-04-24
申请人： Ingmar Graesslin , Peter Boernert , Peter Vernickel , Ulrich Katscher
发明人： Ingmar Graesslin , Peter Boernert , Peter Vernickel , Ulrich Katscher
IPC分类号： G01R33/44
CPC分类号： G01R33/34046 , G01R33/288 , G01R33/3415 , G01R33/543 , G01R33/5604 , G01R33/5611 , G01R33/5659
摘要： A multi-channel RF transmitter arrangement comprising a plurality of RF transmitter elements (e) like RF antennas, antenna elements, coils or coil elements, for generating an RF field, especially for use in a magnetic resonance imaging (MRI) system for exciting nuclear magnetic resonances (NMR), and a method for generating such an RF field is disclosed. The RF transmitter elements (e) are segmented in a plurality of segments (s1, s2, s3, . . . ) at least along the direction of the main magnetic field of the MRI system (or the z-direction or the longitudinal direction.
摘要翻译：一种多通道RF发射器装置，包括多个RF发射器元件（e），例如RF天线，天线元件，线圈或线圈元件，用于产生RF场，特别用于激励核的磁共振成像（MRI）系统公开了磁共振（NMR）和产生这种RF场的方法。 RF发射器元件（e）至少沿着MRI系统的主磁场的方向（或z方向或纵向）被分段成多个段（s1，s2，s3，...）。

5. 发明授权

US08390288B2 Method and RF transmitter arrangement for generating RF fields 有权
标题翻译：用于产生RF场的方法和RF发射器装置
公开(公告)号：US08390288B2
公开(公告)日：2013-03-05
申请号：US12598451
申请日：2008-04-24
申请人： Ingmar Graesslin , Peter Boernert , Peter Vernickel , Ulrich Katscher
发明人： Ingmar Graesslin , Peter Boernert , Peter Vernickel , Ulrich Katscher
IPC分类号： G01V3/00
CPC分类号： G01R33/34046 , G01R33/288 , G01R33/3415 , G01R33/543 , G01R33/5604 , G01R33/5611 , G01R33/5659
摘要： A multi-channel RF transmitter arrangement comprising a plurality of RF transmitter elements like RE antennas, antenna elements, coils or coil elements, for generating an RF field, especially for use in a magnetic resonance imaging system for exciting nuclear magnetic resonances, and a method for generating such an RF field wherein the RF transmitter elements are segmented in a plurality of segments at least along the direction of one or more of the main magnetic field of the MRI system, the z-direction or the longitudinal direction.
摘要翻译：包括多个RF发射器元件的多通道RF发射器装置，如RE天线，天线元件，线圈或线圈元件，用于产生RF场，特别是用于激励核磁共振的磁共振成像系统，以及方法用于产生这样的RF场，其中RF发射器元件至少沿着MRI系统的主磁场，z方向或纵向方向中的一个或多个的方向被分段成多个段。

6. 发明授权

US08941380B2 Real-time local and global SAR estimation for patient safety and improved scanning performance 有权
标题翻译：实时的本地和全球SAR患者安全评估和改进的扫描性能
公开(公告)号：US08941380B2
公开(公告)日：2015-01-27
申请号：US12936540
申请日：2009-04-13
申请人： Ingmar Graesslin , Sven Biederer , Ulrich Katscher , Ferdinand Schweser , Peter Boernert , Paul Royston Harvey , Wilhelmus Reinerius Maria Mens
发明人： Ingmar Graesslin , Sven Biederer , Ulrich Katscher , Ferdinand Schweser , Peter Boernert , Paul Royston Harvey , Wilhelmus Reinerius Maria Mens
IPC分类号： G01R33/44 , G01R33/58 , G01R33/561 , G01R33/28 , G01R33/565
CPC分类号： G01R33/583 , G01R33/288 , G01R33/5612 , G01R33/5659
摘要： In a method and apparatus to enable increased RF duty cycle in high field MR scans, a specific energy absorption rate (SAR) calculation processor calculates the local and global SAR or even a spatial SAR map. By incorporating additional information as, e.g. patient position, the SAR calculation accuracy can be increased as well as by using more patient specific pre-calculated information (e.g. based on different bio meshes), the so called Q-matrices. A sequence controller maybe provided to create a global SAR optimal RF pulse. After the optimal RF pulse is applied, the SAR and its spatial distribution are determined. SAR hotspots are also determined. Q-matrices within an appropriate radius around the hotspots are averaged and added to a global Q-matrix in a weighted fashion. After the global Q-matrix is updated, a new optimal RF pulse is created.
摘要翻译：在能够在高场MR扫描中增加RF占空比的方法和装置中，比能量吸收率（SAR）计算处理器计算局部和全局SAR或甚至空间SAR图。通过引入附加信息，例如。患者位置，SAR计算精度以及通过使用更多患者特定的预先计算的信息（例如，基于不同的生物网格），即所谓的Q矩阵。可以提供序列控制器以创建全局SAR最优RF脉冲。在施加最佳RF脉冲之后，确定SAR及其空间分布。 SAR热点也是决定的。在热点周围的适当半径内的Q矩阵被平均，并以加权的方式加到全局Q矩阵上。在更新全局Q矩阵之后，创建一个新的最优RF脉冲。

7. 发明申请

US20120169333A1 MOTION MONITORING SYSTEM FOR MONITORING MOTION WITHIN A REGION OF INTEREST 审中-公开
标题翻译：运动监测系统，用于监测运动区域内的运动
公开(公告)号：US20120169333A1
公开(公告)日：2012-07-05
申请号：US13394566
申请日：2010-08-16
申请人： Ulrich Katscher , Peter Boernert , Christian Stehning , Ingmar Graesslin
发明人： Ulrich Katscher , Peter Boernert , Christian Stehning , Ingmar Graesslin
IPC分类号： G01R33/025
CPC分类号： G06T7/246 , G06T2207/10072 , G06T2207/30048
摘要： The invention relates to a motion monitoring system (1) for monitoring motion within a region of interest (2). The motion monitoring system (1) comprises a magnetic induction tomography detection data acquisition unit (3) for acquiring MIT detection data of the region of interest (2), and a motion determining unit (4) for determining motion within the region of interest (2) based on the acquired MIT detection data. The invention relates further to an imaging system for imaging a region of interest comprising the motion monitoring system (1). The determined motion can be used for reducing motion artifacts in reconstructed images.
摘要翻译：本发明涉及一种用于监视感兴趣区域（2）内的运动的运动监视系统（1）。运动监视系统（1）包括用于获取感兴趣区域（2）的MIT检测数据的磁感应断层摄影检测数据获取单元（3）和用于确定感兴趣区域内的运动的运动确定单元（4） 2）基于所获得的MIT检测数据。本发明进一步涉及用于对包括运动监视系统（1）的兴趣区域进行成像的成像系统。所确定的运动可用于减少重建图像中的运动伪影。

8. 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。

9. 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。

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。

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