-
公开(公告)号：US09625541B2
公开(公告)日：2017-04-18
申请号：US13933083
申请日：2013-07-01
申请人： Jörg Ulrich Fontius , Holger Adolf , Thomas Benner , Hans-Peter Fautz , Matthias Gebhardt , Rene Gumbrecht
发明人： Jörg Ulrich Fontius , Holger Adolf , Thomas Benner , Hans-Peter Fautz , Matthias Gebhardt , Rene Gumbrecht
CPC分类号： G01R33/288 , G01R33/36
摘要： In order to provide online monitoring of local specific absorption rate (SAR) within a body subject to a magnetic resonance imaging (MRI) scan, directional couplers measure a phase and an amplitude of a transmission radio frequency (RF) pulse generated and transmitted by an MRI system. A measured local SAR value is calculated based on the measured phase and the measured amplitude of the transmission RF pulse using a voxel model of the body and an electromagnetic (EM) simulation. In order to verify proper operation of the local SAR monitoring, the measured local SAR value is compared to a predetermined local SAR value.
-
2.发明申请公开(公告)号：US20150260807A1
公开(公告)日：2015-09-17
申请号：US14645215
申请日：2015-03-11
IPC分类号： G01R33/36
CPC分类号： G01R33/3607 , G01R33/3415 , G01R33/5612
摘要： A circuit arrangement for driving a transmission coil arrangement with at least two individual transmission coils of a magnetic resonance system for supplying a radiofrequency signal for producing alternating electromagnetic fields over at least two channels, with in each case a digital section and an analog section, is provided. In the digital section, in an envelope generator, base frequency signals that respectively generate an envelope are provided. The circuit arrangement also includes an intermediate frequency oscillator that generates a common intermediate frequency, a frequency mixer per channel for mixing the common intermediate frequency into the base frequency signals, and in the analog sections of the channels, respectively, second frequency mixers that mix a common radiofrequency signal into each base frequency signal. The envelope is transmitted, with the mixed-in intermediate frequency signal, and the total signal thus obtained is respectively conducted to an individual transmission coil via a respective amplifier.
摘要翻译： 用于驱动具有磁共振系统的至少两个单独传输线圈的传输线圈装置的电路装置，用于提供用于在至少两个通道上产生交变电磁场的射频信号，在每种情况下都是数字部分和模拟部分， 提供。 在数字部分中，在信封发生器中，提供分别产生信封的基频信号。 该电路装置还包括分别产生公共中频的中频振荡器，每个通道的混频器，用于将公共中频混合到基频信号中的频率混合器，以及通道的模拟部分，混频器 将普通的射频信号转换成每个基频信号。 通过混合的中频信号发送包络，并且由此获得的总信号经由相应的放大器分别传送到单独的传输线圈。
-
公开(公告)号：US20150077108A1
公开(公告)日：2015-03-19
申请号：US14481596
申请日：2014-09-09
申请人： Holger Adolf , Thomas Benner , Hans-Peter Fautz , Jörg Ulrich Fontius , Rene Gumbrecht , Franz Schmitt
发明人： Holger Adolf , Thomas Benner , Hans-Peter Fautz , Jörg Ulrich Fontius , Rene Gumbrecht , Franz Schmitt
CPC分类号： G01R33/543 , G01R33/36 , G01R33/5659
摘要： The embodiments relate to methods for measurement of RF excitation pulses by a magnetic resonance device including the following acts: (1) sending of an RF excitation pulse by a radio-frequency system of the magnetic resonance device, (2) triggering of a receive event for capturing the RF excitation pulse by the control device of the magnetic resonance device, and (3) capturing of the sent RF excitation pulse in the form of excitation data by the radio frequency system. In certain embodiments, the excitation data is used for checking process execution sequences.
摘要翻译： 实施例涉及通过磁共振装置测量RF激励脉冲的方法，包括以下动作：（1）通过磁共振装置的射频系统发送RF激励脉冲，（2）触发接收事件 用于通过磁共振装置的控制装置捕获RF激励脉冲，以及（3）通过射频系统以激励数据的形式捕获发送的RF激励脉冲。 在某些实施例中，激励数据用于检查过程执行序列。
-
公开(公告)号：US20150002147A1
公开(公告)日：2015-01-01
申请号：US13933083
申请日：2013-07-01
申请人： Jörg Ulrich Fontius , Holger Adolf , Thomas Benner , Hans-Peter Fautz , Matthias Gebhardt , Rene Gumbrecht
发明人： Jörg Ulrich Fontius , Holger Adolf , Thomas Benner , Hans-Peter Fautz , Matthias Gebhardt , Rene Gumbrecht
CPC分类号： G01R33/288 , G01R33/36
摘要： In order to provide online monitoring of local specific absorption rate (SAR) within a body subject to a magnetic resonance imaging (MRI) scan, directional couplers measure a phase and an amplitude of a transmission radio frequency (RF) pulse generated and transmitted by an MRI system. A measured local SAR value is calculated based on the measured phase and the measured amplitude of the transmission RF pulse using a voxel model of the body and an electromagnetic (EM) simulation. In order to verify proper operation of the local SAR monitoring, the measured local SAR value is compared to a predetermined local SAR value.
摘要翻译： 为了提供在经受磁共振成像（MRI）扫描的身体内的局部比吸收率（SAR）的在线监测，定向耦合器测量由一个或多个磁共振成像（MRI）生成和传输的传输射频（RF）脉冲的相位和幅度 MRI系统。 基于使用身体的体素模型和电磁（EM）模拟的测量相位和传输RF脉冲的测量幅度来计算测量的局部SAR值。 为了验证局部SAR监测的正确操作，将测量的局部SAR值与预定的局部SAR值进行比较。
-
公开(公告)号：US20140307764A1
公开(公告)日：2014-10-16
申请号：US14251595
申请日：2014-04-12
IPC分类号： H04B17/00
CPC分类号： H04B17/12 , G01R33/3607 , G01R33/5612 , G01R33/586
摘要： A method for operating a transmission device of a magnetic resonance device is provided. In order to actuate coil elements of a radiofrequency coil with different phases, phase differences in a reference plane are taken into consideration. In a first calibration measurement to be performed once for each transmission path, a first phase of a transmitted radiofrequency signal is measured by an internal measuring device installed permanently in the transmission device spaced apart from the reference plane. A second phase of the transmitted radiofrequency signal is measured by a second, external measuring device to be connected to the reference plane for the first calibration measurement. At least one phase of the first phase and the second phase is taken into consideration in the phase-accurate actuating of the coil elements and/or for correcting further measurements with the internal measuring device.
摘要翻译： 提供了一种用于操作磁共振装置的传输装置的方法。 为了激励具有不同相位的射频线圈的线圈元件，考虑到参考平面中的相位差。 在对于每个传输路径执行一次的第一校准测量中，通过永久安装在与参考平面间隔开的传输设备中的内部测量设备测量发射的射频信号的第一相位。 发射的射频信号的第二阶段由第二外部测量装置测量，以连接到用于第一校准测量的参考平面。 在线圈元件的相位精确致动中和/或用于利用内部测量装置校正进一步的测量时，考虑到第一相和第二相的至少一相。
-
公开(公告)号：US07812319B2
公开(公告)日：2010-10-12
申请号：US12112846
申请日：2008-04-30
申请人： Dirk Diehl , Rene Gumbrecht , Eva Schneider
发明人： Dirk Diehl , Rene Gumbrecht , Eva Schneider
IPC分类号： H01J1/50
CPC分类号： G21K1/093
摘要： A beam guiding magnet includes a first and second coil system, which are designed such that the dipole moments of the first and second coil systems point in opposite directions. Since the dipole moments of the first and second coil systems point in opposite directions, the two dipole moments at least partially compensate for one another. The resultant dipole moment of the beam guiding magnet may be reduced. The beam guiding magnet may take into account that the remote field of a beam guiding magnet can be lowered by a reduction in the dipole moment of the beam guiding magnet. The dipole moment decreases with the cube of the distance from the beam guiding magnet. A quadruple moment, which on attenuation of the dipole moment represents the next strongest field component, decreases with the fifth power of that distance.
摘要翻译： 梁引导磁体包括第一和第二线圈系统，其被设计成使得第一和第二线圈系统的偶极矩指向相反的方向。 由于第一和第二线圈系统的偶极矩指向相反方向，所以两个偶极矩至少部分地相互补偿。 所导致的导光磁体的偶极矩可能减小。 光束引导磁体可以考虑到通过减小导光磁体的偶极矩可以降低光束引导磁体的远场。 偶极矩随距离导光磁体距离的立方体减小。 在偶极矩的衰减表示下一个最强场分量的四倍时刻随着该距离的第五功率而减小。
-
7.发明申请MAGNETIC RESONANCE APPARATUS AND METHOD FOR DETERMINING A PULSE SEQUENCE TO FEED AN RF RADIATING COIL 有权磁共振装置和确定脉冲序列以输入RF放射线圈的方法公开(公告)号：US20090322329A1
公开(公告)日：2009-12-31
申请号：US12487748
申请日：2009-06-19
申请人： Dirk Diehl , Rene Gumbrecht , Juergen Nistler , Wolfgang Renz , Markus Vester , Sebastian Wolf
发明人： Dirk Diehl , Rene Gumbrecht , Juergen Nistler , Wolfgang Renz , Markus Vester , Sebastian Wolf
CPC分类号： G01R33/3415 , A61B5/055 , G01R33/288 , G01R33/4833 , G01R33/5612 , G01R33/5659
摘要： In a magnetic resonance apparatus having an RF radiating coil and gradient coils, and in a method for operating such a magnetic resonance apparatus, a pulse sequence, composed of multiple time steps, is specified for operating the gradient coils to time-dependently select regions of a selected slice of a selected volume of a subject. A non-linear equation system is then solved to obtain feed parameters for individual channels of the transmit coil for each time step, with specification of a desired target magnetization, and dependent on the pulse sequence specified for the gradient coils. The non-linear equation system is based on discrete values for time and space variable and, in addition to equations resulting from the Bloch equation, which are non-linear in their feed parameters, includes at least one additional equation that describes boundary conditions for the examination of the subject.
摘要翻译： 在具有RF辐射线圈和梯度线圈的磁共振装置中，并且在用于操作这种磁共振装置的方法中，规定了由多个时间步长组成的脉冲序列，用于操作梯度线圈以时间依次选择 所选择的受试者体积的切片。 然后解决非线性方程式，以获得每个时间步长的发射线圈的各个通道的馈送参数，并且具有期望的目标磁化强度，并且取决于为梯度线圈指定的脉冲序列。 非线性方程系统基于时间和空间变量的离散值，并且除了在其馈送参数中是非线性的由Bloch方程得到的方程之外，还包括至少一个附加方程，其描述了边界条件 考试题目。
-
公开(公告)号：US10761155B2
公开(公告)日：2020-09-01
申请号：US14332070
申请日：2014-07-15
摘要： In order to reduce the memory footprint used for monitoring specific absorption rate (SAR) in a magnetic resonance imaging (MRI) system, a hybrid sliding window method is provided. The method includes receiving a measured value once every first time interval, processing the measured value, and storing a value resulting from the processing in a first memory element. Measured values stored in second memory elements are summed every second time interval, where the first time interval is less than the second time interval. A representation of SAR is calculated every first time interval based on the value resulting from the processing and the sum of the measured values of the second memory elements. When the second time interval is reached, the value stored in the first memory element is moved to one of the second memory elements, and the value stored in the first memory element is reset to zero.
-
公开(公告)号：US10416258B2
公开(公告)日：2019-09-17
申请号：US13856231
申请日：2013-04-03
申请人： Hans Peter Fautz , Rene Gumbrecht
发明人： Hans Peter Fautz , Rene Gumbrecht
IPC分类号： G01R33/54 , G01R33/483 , G01R33/565 , G01R33/3415
摘要： A method for controlling a magnetic resonance system outputs a pulse sequence including a first slice-selective excitation pulse that excites a first slice with a first magnetization. The pulse sequence includes a second slice-selective excitation pulse that excites a second slice with the first magnetization and a third slice-selective excitation pulse that excites the first slice with a second magnetization that cancels the first magnetization. The pulse sequence also includes and a fourth slice-selective excitation pulse that excites the second slice with a magnetization that cancels the first magnetization. The first slice and the second slice intersect.
-
公开(公告)号：US10135549B2
公开(公告)日：2018-11-20
申请号：US14251595
申请日：2014-04-12
IPC分类号： H04B17/00 , G01R33/36 , H04B17/12 , G01R33/561 , G01R33/58
摘要： A method for operating a transmission device of a magnetic resonance device is provided. In order to actuate coil elements of a radiofrequency coil with different phases, phase differences in a reference plane are taken into consideration. In a first calibration measurement to be performed once for each transmission path, a first phase of a transmitted radiofrequency signal is measured by an internal measuring device installed permanently in the transmission device spaced apart from the reference plane. A second phase of the transmitted radiofrequency signal is measured by a second, external measuring device to be connected to the reference plane for the first calibration measurement. At least one phase of the first phase and the second phase is taken into consideration in the phase-accurate actuating of the coil elements and/or for correcting further measurements with the internal measuring device.
-
-
-
-
-
-
-
-
-
搜索结果
34 条记录 (耗时 0.014 秒)
