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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。
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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。
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公开(公告)号：US20130300415A1
公开(公告)日：2013-11-14
申请号：US13977930
申请日：2011-12-27
IPC分类号： G01R33/34
CPC分类号： G01R33/34 , G01R33/3678 , G01R33/5612 , G01R33/5659
摘要： The invention relates to a multi-channel (e.g. quadrature) MRI transmit system in which RF power amplifiers having different power capabilities are used in different transmit channels. This results in reduced system costs, due to the avoidance of an unused excess of RF power capability when the power demand for obtaining a homogeneous B1-field (RF shimming) is asymmetric and the asymmetry is qualitatively the same for different imaging applications. The multi-channel transmit unit may also comprise a commutator which enables to selectively connect each RF power amplifier to each drive port of transmit coil arrangement (e.g. a birdcage coil).
摘要翻译： 本发明涉及一种多通道（例如正交）MRI发射系统，其中具有不同功率能力的RF功率放大器用于不同的发射信道。 这导致了当获得均匀B1场（RF匀场）的功率需求是不对称的且不对称性对于不同的成像应用在质量上是相同的时，由于避免了RF功率能力的未使用过量而导致系统成本降低。 多通道发射单元还可以包括换向器，其能够将每个RF功率放大器选择性地连接到发射线圈装置（例如鸟笼线圈）的每个驱动端口。
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公开(公告)号：US09588196B2
公开(公告)日：2017-03-07
申请号：US13977930
申请日：2011-12-27
IPC分类号： G01V3/00 , G01R33/34 , G01R33/36 , G01R33/561 , G01R33/565
CPC分类号： G01R33/34 , G01R33/3678 , G01R33/5612 , G01R33/5659
摘要： The invention relates to a multi-channel (e.g. quadrature) MRI transmit system in which RF power amplifiers having different power capabilities are used in different transmit channels. This results in reduced system costs, due to the avoidance of an unused excess of RF power capability when the power demand for obtaining a homogeneous B1-field (RF shimming) is asymmetric and the asymmetry is qualitatively the same for different imaging applications. The multi-channel transmit unit may also comprise a commutator which enables to selectively connect each RF power amplifier to each drive port of transmit coil arrangement (e.g. a birdcage coil).
摘要翻译： 本发明涉及一种多通道（例如正交）MRI发射系统，其中具有不同功率能力的RF功率放大器用于不同的发射信道。 这导致了当获得均匀B1场（RF匀场）的功率需求是不对称的且不对称性对于不同的成像应用在质量上是相同的时，由于避免了RF功率能力的未使用过量而导致系统成本降低。 多通道发射单元还可以包括换向器，其能够将每个RF功率放大器选择性地连接到发射线圈装置（例如鸟笼线圈）的每个驱动端口。
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公开(公告)号：US07301340B2
公开(公告)日：2007-11-27
申请号：US10553327
申请日：2004-04-05
IPC分类号： G01V3/00
CPC分类号： G01R33/565
摘要： A magnetic resonance imaging system comprises reconstruction unit that is arranged to reconstruct a complex image of complex valued pixels from magnetic resonance signals. A compute a distribution of phase values of the complex image and to apply a phase correction to the complex image to form a corrected magnetic resonance image. The phase correction is controlled on the basis of the distribution of phase values of the complex image. Notably, the histogram power function is an effective indicator of the accuracy of the phase correction.
摘要翻译： 磁共振成像系统包括重建单元，其被配置为从磁共振信号重构复数像素的复数图像。 A计算复数图像的相位值分布，并对复像进行相位校正以形成校正的磁共振图像。 基于复数图像的相位值的分布来控制相位校正。 值得注意的是，直方图功率函数是相位校正精度的有效指标。
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公开(公告)号：US09535142B2
公开(公告)日：2017-01-03
申请号：US14112152
申请日：2012-04-13
IPC分类号： G01V3/00 , G01R33/34 , G01R33/3415 , G01R33/36 , G01R33/561
CPC分类号： G01R33/34092 , G01R33/3415 , G01R33/3664 , G01R33/5612
摘要： An RF volume resonator system is disclosed comprising a multi-port RF volume resonator (40, 50; 60), like e.g. a TEM volume coil or TEM resonator, or a birdcage coil, all of those especially in the form of a local coil like a head coil, or a whole body coil, and a plurality of transmit and/or receive channels (T/RCh1, . . . T/RCh8) for operating the multi-port RF volume resonator for transmitting RF excitation signals and/or for receiving MR relaxation signals into/from an examination object or a part thereof. By the individual selection of each port (P1, . . . P8) and the appropriate amplitude and/or frequency and/or phase and/or pulse shapes of the RF transmit signals according to the physical properties of an examination object, a resonant RF mode within the examination object with an improved homogeneity can be excited by the RF resonator.
摘要翻译： 公开了一种RF体积谐振器系统，其包括多端口RF体积谐振器（40,50,60） TEM体积线圈或TEM谐振器或鸟笼线圈，所有这些特别是诸如头部线圈的局部线圈或全体线圈以及多个发射和/或接收通道（T / RCh1， ... T / RCh8），用于操作用于发送RF激励信号的多端口RF体积谐振器和/或用于从检查对象或其部分接收MR松弛信号。 通过根据检查对象的物理特性单独选择每个端口（P1，...，P8）和适当的幅度和/或频率和/或RF发射信号的相位和/或脉冲形状，共振RF 可以通过RF谐振器激发具有改进的均匀性的检查对象内的模式。
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公开(公告)号：US20140055136A1
公开(公告)日：2014-02-27
申请号：US14112152
申请日：2012-04-13
IPC分类号： G01R33/34
CPC分类号： G01R33/34092 , G01R33/3415 , G01R33/3664 , G01R33/5612
摘要： Abstract: An RF volume resonator system is disclosed comprising a multi-port RF volume resonator (40, 50; 60), like e.g. a TEM volume coil or TEM resonator, or a birdcage coil, all of those especially in the form of a local coil like a head coil, or a whole body coil, and a plurality of transmit and/or receive channels (T/RCh1, . . . T/RCh8) for operating the multi-port RF volume resonator for transmitting RF excitation signals and/or for receiving MR relaxation signals into/from an examination object or a part thereof. By the individual selection of each port (P1, . . . P8) and the appropriate amplitude and/or frequency and/or phase and/or pulse shapes of the RF transmit signals according to the physical properties of an examination object, a resonant RF mode within the examination object with an improved homogeneity can be excited by the RF resonator.
摘要翻译： 摘要：公开了一种RF体积谐振器系统，其包括多端口RF体积谐振器（40,50,60） TEM体积线圈或TEM谐振器或鸟笼线圈，所有这些特别是诸如头部线圈的局部线圈或全体线圈以及多个发射和/或接收通道（T / RCh1， ... T / RCh8），用于操作用于发送RF激励信号的多端口RF体积谐振器和/或用于从检查对象或其部分接收MR松弛信号。 通过根据检查对象的物理特性单独选择每个端口（P1，...，P8）和适当的幅度和/或频率和/或RF发射信号的相位和/或脉冲形状，共振RF 可以通过RF谐振器激发具有改进的均匀性的检查对象内的模式。
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8.发明授权公开(公告)号：US07372265B2
公开(公告)日：2008-05-13
申请号：US10544513
申请日：2004-01-29
IPC分类号： G01V3/00
CPC分类号： G01R33/3854
摘要： A magnetic resonance imaging (MRI) system includes an examination volume (9), a main magnet system (17) for generating a main magnetic field (B0) in the examination volume, a gradient magnet system (25) for generating gradients of the main magnetic field, and a control system (37) for compensating disturbances of the magnetic field caused by mechanical vibrations of the MRI system. The control system is a feed-forward control system which determines a necessary compensation for said disturbances in dependence on an electric current in the gradient magnet system according to a predetermined response relation. Since in most MRI systems the mechanical vibrations are predominantly caused by the altering electric currents in the gradient magnet system and by eddy currents induced thereby, an accurate and reliable compensation for said disturbances is provided, so that artifacts and other distortions of the reconstructed image caused by said disturbances are considerably reduced.
摘要翻译： 磁共振成像（MRI）系统包括检查体积（9），用于在检查体积中产生主磁场（B
0>）的主磁体系统（17），梯度磁体系统 25），用于产生主磁场的梯度的控制系统（37），以及用于补偿由MRI系统的机械振动引起的磁场的扰动的控制系统（37）。 控制系统是前馈控制系统，其根据预定的响应关系，根据梯度磁铁系统中的电流确定对所述干扰的必要补偿。 由于在大多数MRI系统中，机械振动主要是由梯度磁体系统中的变化电流和由此引起的涡流引起的，因此提供了对所述扰动的准确可靠的补偿，从而引起重建图像的伪像和其他失真 通过所述干扰大大减少。
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