-
1.发明申请REAL-TIME LOCAL AND GLOBAL SAR ESTIMATION FOR PATIENT SAFETY AND IMPROVED SCANNING PERFORMANCE 有权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。
-
2.发明授权Real-time local and global SAR estimation for patient safety and improved scanning performance 有权实时的本地和全球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。
-
3.发明授权公开(公告)号：US09316710B2
公开(公告)日：2016-04-19
申请号：US13258622
申请日：2010-03-31
IPC分类号： G01R33/44 , G01R33/3415 , G01R33/561 , G01R33/28 , G01R33/54 , G01R33/565
CPC分类号： G01R33/3415 , G01R33/288 , G01R33/543 , G01R33/5612 , G01R33/5659
摘要： A magnetic resonance sequence includes a repetitively applied radiofrequency pulse capable of causing a specific absorption rate (SAR) hot spot. The composition of the repetitive pulse is varied to generate versions of the repetitive pulse such that the SAR hot spot changes locations with subsequent applications of the repetitive pulse. To generate versions of the pulse, a pilot scan is performed to generate a patient model. A simulation of the SAR response to each of the versions of the repetitive pulse is performed to determine the location of SAR hot spot(s). A plurality of versions of the repetitive pulse is selected to be used in the magnetic resonance sequence.
摘要翻译： 磁共振序列包括能够引起比吸收率（SAR）热点的重复施加的射频脉冲。 改变重复脉冲的组成以产生重复脉冲的形式，使得SAR热点随后应用重复脉冲而改变位置。 为了产生脉冲的版本，执行导频扫描以产生患者模型。 执行对每个重复脉冲版本的SAR响应的模拟，以确定SAR热点的位置。 选择在磁共振序列中使用多个版本的重复脉冲。
-
4.发明申请公开(公告)号：US20120013337A1
公开(公告)日：2012-01-19
申请号：US13258622
申请日：2010-03-31
IPC分类号： G01R33/44
CPC分类号： G01R33/3415 , G01R33/288 , G01R33/543 , G01R33/5612 , G01R33/5659
摘要： A magnetic resonance sequence includes a repetitively applied radiofrequency B1 pulse capable of causing a specific absorption rate (SAR) hot spot. The composition of the repetitive B1 pulse is varied to generate versions of the repetitive B1 pulse such that the SAR hot spot changes locations with subsequent applications of the repetitive B1 pulse. To generate versions of the B1 pulse, a pilot scan is performed to generate a patient model. A simulation of the SAR response to each of the versions of the repetitive B1 pulse is performed to determine the location of SAR hot spot(s). A plurality of versions of the repetitive B1 pulse is selected to be used in the magnetic resonance sequence.
摘要翻译： 磁共振序列包括能够引起比吸收率（SAR）热点的重复施加的射频B1脉冲。 改变重复B1脉冲的组成以产生重复B1脉冲的形式，使得SAR热点随后应用重复的B1脉冲而改变位置。 为了生成B1脉冲的版本，执行导频扫描以产生患者模型。 执行对每个重复B1脉冲版本的SAR响应的模拟，以确定SAR热点的位置。 选择在磁共振序列中使用多个版本的重复B1脉冲。
-
公开(公告)号：US20100141259A1
公开(公告)日：2010-06-10
申请号：US12598451
申请日：2008-04-24
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，...）。
-
公开(公告)号：US08390288B2
公开(公告)日：2013-03-05
申请号：US12598451
申请日：2008-04-24
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。
-
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。
-
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。
-
9.发明申请MOTION MONITORING SYSTEM FOR MONITORING MOTION WITHIN A REGION OF INTEREST 审中-公开运动监测系统，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
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。
-
10.发明申请SAR REDUCTION IN PARALLEL TRANSMISSION BY K-SPACE DEPENDENT RF PULSE SELECTION 有权通过K空间依赖射频脉冲选择并行传输的SAR减少公开(公告)号：US20120019247A1
公开(公告)日：2012-01-26
申请号：US13260580
申请日：2010-04-01
申请人： Peter Boernert , Ingmar Graesslin , Kay Nehrke
发明人： Peter Boernert , Ingmar Graesslin , Kay Nehrke
CPC分类号： G01R33/3415 , G01R33/288 , G01R33/543 , G01R33/5612 , G01R33/5659
摘要： When generating an MR image using a multi-channel transmit coil arrangement, SAR is reduced by employing a number of different RF pulses in a single scan. Each RF pulse exhibits a different performance and/or accuracy, resulting in different RF pulse-specific SAR values. As a result, the RF pulses differ slightly in actual excitation pattern, B1 waveform and/or k-space trajectory, etc. The average SAR over a single scan is thus reduced compared to a fixed RF pulse, without compromising image quality.
摘要翻译： 当使用多通道发射线圈装置产生MR图像时，通过在单次扫描中采用多个不同的RF脉冲来减小SAR。 每个RF脉冲表现出不同的性能和/或精度，导致不同的RF脉冲特定SAR值。 结果，RF脉冲在实际激励模式，B1波形和/或k空间轨迹等方面略有差异。与固定的RF脉冲相比，单次扫描的平均SAR相比降低，而不影响图像质量。
-
-
-
-
-
-
-
-
-
搜索结果
64 条记录 (耗时 0.029 秒)
