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1. 发明授权

US5087880A Method for sensing nuclear magnetic resonance signals given arbitrary gradient shapes 失效
标题翻译：用于检测给定任意梯度形状的核磁共振信号的方法
公开(公告)号：US5087880A
公开(公告)日：1992-02-11
申请号：US482963
申请日：1990-02-22
申请人： Herbert Bruder , Hubertus Fischer , Hans-Erich Reinfelder , Franz Schmitt
发明人： Herbert Bruder , Hubertus Fischer , Hans-Erich Reinfelder , Franz Schmitt
IPC分类号： A61B5/055 , G01R33/48 , G01R33/565
CPC分类号： G01R33/56572 , G01R33/56545
摘要： A method for operating a nuclear resonance imaging device given gradients of arbitrary shapes includes the steps of equidistantly sampling the nuclear magnetic resonance signals in the time domain with a sampling rate that satisfies the sampling theorem, the sampling taking place even given gradients having a non-rectangular pulse shape. Since non-equidistant sampling in the K-space would normally lead to image artifacts, the method includes the further step, to avoid such artifacts, of calculating measured values from the acquired samples by interpolation, these measured values being equidistant in the K-space, and being entered into a measurement matrix. The equidistant sampling in the K-space, which is complicated, is thus superfluous given gradients having an arbitrary pulse shape.
摘要翻译：给定给定任意形状梯度的核共振成像装置的方法包括以满足采样定理的采样速率等时采样时域中的核磁共振信号的步骤，即使给定梯度具有非线性的采样，矩形脉冲形状。由于K空间中的非等距采样通常会导致图像伪影，所以该方法还包括进一步的步骤，为了避免这种伪像，通过插值从所采集的样本中计算测量值，这些测量值在K空间中是等距的，并输入测量矩阵。因此，复杂的K空间中的等距采样因此是具有任意脉冲形状的给定梯度的多余采样。

2. 发明授权

US5068609A Method for generating an image using nuclear magnetic resonance signals 失效
标题翻译：使用核磁共振信号产生图像的方法
公开(公告)号：US5068609A
公开(公告)日：1991-11-26
申请号：US524344
申请日：1990-05-16
申请人： Herbert Bruder , Hubertus Fischer , Franz Schmitt , Hans-Erich Reinfelder
发明人： Herbert Bruder , Hubertus Fischer , Franz Schmitt , Hans-Erich Reinfelder
IPC分类号： G01R33/565
CPC分类号： G01R33/56554 , G01R33/56545
摘要： A method for generating an image using nuclear magnetic resonance signals, which substantially eliminates the presence of so-called "N/2 ghosts," includes the steps of dividing a measurement matrix into a first sub-matrix containing the even-numbered rows of the measurement matrix and into a second sub-matrix having the odd-numbered rows of the measurement matrix, setting the entries in the remaining rows of the sub-matrices to zero, subjecting both sub-matrices to a Fourier transformation at least in the column direction, thereby generating respective intermediate image matrices, multiplying one of the intermediate image matrices by a factor which is calculated from the edge rows of the intermediate image matrices, and adding the intermediate image matrices after the multiplication.
摘要翻译：使用核磁共振信号产生图像的方法基本上消除了所谓的“N / 2重影”的存在，包括以下步骤：将测量矩阵划分成包含偶数行的第一子矩阵测量矩阵和具有测量矩阵的奇数行的第二子矩阵，将子矩阵的剩余行中的条目设置为零，使两个子矩阵至少在列方向上进行傅里叶变换从而生成各自的中间图像矩阵，将中间图像矩阵中的一个乘以从中间图像矩阵的边缘行计算的因子，并且在相乘之后相加中间图像矩阵。

3. 发明授权

US5298863A Magnetic resonance imaging apparatus having a resonant circuit for generating gradient fields, and method for operating same 失效
标题翻译：具有用于产生梯度场的谐振电路的磁共振成像装置及其操作方法
公开(公告)号：US5298863A
公开(公告)日：1994-03-29
申请号：US621040
申请日：1990-12-03
申请人： Stefan Nowak , Franz Schmitt , Hubertus Fischer
发明人： Stefan Nowak , Franz Schmitt , Hubertus Fischer
IPC分类号： G01R33/385 , G01R33/20
CPC分类号： G01R33/3852
摘要： A gradient coil for generating a periodically changing read-out gradient in a magnetic resonance imaging apparatus is operated in a series resonant circuit having a capacitor. One of the elements of the series resonant circuit is charged before the beginning of each read-out gradient. The gradient coil can be charged with current, or the capacitor can be charged with voltage. Such operation either avoids or significantly shortens the transient effect which occurs after excitation of the nuclear spins. The use of a series resonant circuit instead of a parallel resonant circuit significantly reduces the voltage load on the gradient amplifier, so that the gradient amplifier can be constructed simpler and more inexpensively.
摘要翻译：在具有电容器的串联谐振电路中操作用于在磁共振成像装置中产生周期性变化的读出梯度的梯度线圈。在每个读出梯度的开始之前，串联谐振电路的元件之一被充电。梯度线圈可以充电电流，或者电容器可以充电电压。这种操作可以避免或显着缩短在核自旋激发后发生的瞬态效应。使用串联谐振电路代替并联谐振电路可以显着降低梯度放大器的电压负载，从而使梯度放大器的构造更简单，成本更低。

4. 发明授权

US5617030A Method and apparatus for gradient power supply for a nuclear magnetic resonance tomography apparatus 失效
标题翻译：用于核磁共振断层摄影装置的梯度电源的方法和装置
公开(公告)号：US5617030A
公开(公告)日：1997-04-01
申请号：US621622
申请日：1996-03-26
申请人： Hubertus Fischer , Stefan Nowak , Franz Schmitt
发明人： Hubertus Fischer , Stefan Nowak , Franz Schmitt
IPC分类号： A61B5/055 , G01R33/385 , G01V3/00
CPC分类号： G01R33/3852
摘要： A gradient coil is connected to a controllable gradient amplifier via a first diagonal of a bridge circuit having four switches and unbiased diodes respectively connected parallel thereto. A capacitor that forms a resonant circuit together with the gradient coil is connected into the second bridge diagonal of the bridge circuit. A sinusoidal current is supplied through the gradient coil. Due to intentionally incomplete discharging of the capacitor at every other half-wave, an offset current can be superimposed on the sinusoidal current through the gradient coil.
摘要翻译：梯形线圈经由具有四个分别与其并联连接的开关和无偏置二极管的桥接电路的第一对角线连接到可控梯度放大器。与梯度线圈一起形成谐振电路的电容器被连接到桥式电路的第二桥对角线中。通过梯形线圈提供正弦电流。由于电容器在每隔一个半波有意不完全放电，偏移电流可以叠加在通过梯度线圈的正弦电流上。

5. 发明授权

US4901020A Pulse sequence for operating a nuclear magnetic resonance tomography apparatus for producing images with different T.sub.2 contrast 失效
标题翻译：用于操作用于产生具有不同T2对比度的图像的核磁共振断层摄影装置的脉冲序列
公开(公告)号：US4901020A
公开(公告)日：1990-02-13
申请号：US327891
申请日：1989-03-23
申请人： Ralf Ladebeck , Hubertus Fischer , Franz Schmitt
发明人： Ralf Ladebeck , Hubertus Fischer , Franz Schmitt
IPC分类号： G01R33/50 , G01R33/56
CPC分类号： G01R33/56 , G01R33/50
摘要： A pulse sequence is disclosed for operating a nuclear magnetic resonance tomography apparatus for producing images having different T.sub.2 contrast. A signal for the gradient-echo imaging is first acquired after excitation of the nuclei subsequently, the magnetization, which is already prepared for imaging, is refocused by a 180.degree. radio-frequency pulse, and a second echo is measured in the presence of a readout gradient. Independent images having different T.sub.2 contrast can be reconstructed with the gradient echo and with the spin echo. It is thus possible to simultaneously measure a gradient echo image having a significantly lower T.sub.2 contrast during the measuring time for a spin echo image.
摘要翻译：公开了用于操作用于产生具有不同T2对比度的图像的核磁共振断层摄影装置的脉冲序列。梯度回波成像的信号首先在核心激发之后被采集，已经准备好用于成像的磁化被180度射频脉冲重新聚焦，并且在存在下测量第二回波读出梯度。可以用梯度回波和自旋回波重建具有不同T2对比度的独立图像。因此，可以在自旋回波图像的测量时间期间同时测量具有显着较低T2对比度的梯度回波图像。

6. 发明授权

US5162730A Method for operating a magnetic resonant imaging tomography apparatus 失效
标题翻译：用于操作磁共振成像测量装置的方法
公开(公告)号：US5162730A
公开(公告)日：1992-11-10
申请号：US611677
申请日：1990-11-13
申请人： Franz Schmitt , Hubertus Fischer
发明人： Franz Schmitt , Hubertus Fischer
IPC分类号： G01R33/561
CPC分类号： G01R33/5615 , G01R33/5616
摘要： A method, in the form of a pulse sequence for operating a magnetic resonance imaging tomography apparatus according to a modification of the echo planar method includes the generation of a read-out gradient consisting of sub-pulses having reversing polarity, the read-out gradient being activated in each scan after an RF excitation. A phase coding gradient, also consisting of a number of sub-pulses, is activated at each polarity change of the read-out gradient. The sub-pulses of the phase coding gradient have a polarity which alternates from sub-pulse to sub-pulse, and an amplitude-time area which increases in steps. An improved signal-to-noise ratio is achieved with this pulse sequence and N/2 ghosts are avoided.
摘要翻译：根据回波平面方法的修改的用于操作磁共振成像断层摄影装置的脉冲序列形式的方法包括产生由具有反向极性的子脉冲，读出梯度在RF激发后在每次扫描中被激活。在读出的梯度的每个极性变化下激活也由多个子脉冲组成的相位编码梯度。相位编码梯度的子脉冲具有从子脉冲到次脉冲交替的极性，以及逐步增加的幅度 - 时间区域。通过该脉冲序列实现改善的信噪比，并避免N / 2个重影。

7. 发明申请

US20140306708A1 Magnetic Resonance Apparatus with Group-by-Group Actuation of Transmission Antennas 审中-公开
标题翻译：传输天线群组驱动的磁共振装置
公开(公告)号：US20140306708A1
公开(公告)日：2014-10-16
申请号：US14250140
申请日：2014-04-10
申请人： Hans-Peter Fautz , Matthias Gebhardt , Franz Schmitt
发明人： Hans-Peter Fautz , Matthias Gebhardt , Franz Schmitt
IPC分类号： G01R33/36
CPC分类号： G01R33/36 , G01R33/288 , G01R33/34092
摘要： A magnetic resonance apparatus including transmission antennas that may be actuated in parallel by a control device of the magnetic resonance apparatus may be operated in a group mode. In the group mode, the transmission antennas are grouped into groups of transmission antennas. The actuation signals of transmission antennas within the respective group are in a respectively predefined relationship relative to one another. A respective group actuation signal for each of the groups of transmission antennas is prescribed for the control device by an operator. The control device carries out checks as to whether a group exposure value established based on the group actuation signals lies below a maximum admissible group exposure limit. If this is the case, the control device establishes the actuation signals for the individual transmission antennas based on the group actuation signals. If this is not the case, the control device carries out another measure.
摘要翻译：包括可由磁共振装置的控制装置并行致动的发送天线的磁共振装置可以以组模式操作。在组模式中，发送天线被分组成发送天线组。相应组内的发射天线的致动信号相对于彼此分别是预定义的关系。用于操作者的控制装置规定了用于发送天线组中的每一组的相应组致动信号。控制装置执行基于组致动信号建立的组曝光值是否在最大允许组暴露极限以下的检查。如果是这种情况，则控制装置基于组致动信号建立各个发送天线的致动信号。如果不是这样，则控制装置执行另一个测量。

8. 发明授权

US08000770B2 Magnetic resonance apparatus with table movement controlled dependent on magnetic field distribution 有权
标题翻译：具有表移动控制的磁共振装置取决于磁场分布
公开(公告)号：US08000770B2
公开(公告)日：2011-08-16
申请号：US11777334
申请日：2007-07-13
申请人： Franz Schmitt
发明人： Franz Schmitt
IPC分类号： A61B5/055
CPC分类号： A61B5/0555 , G01R33/288 , G01R33/307
摘要： A magnetic resonance device has a patient bed able to be automatically moved by means of a drive apparatus into a patient chamber, as well as a magnet arrangement for creating a magnetic field in the interior of the patient chamber. The drive apparatus is operated so as to move the patient bed at a speed determined as a function of the distribution of the magnetic field in the direction of movement of the patient bed.
摘要翻译：磁共振装置具有能够通过驱动装置自动移动到病人室中的患者床，以及用于在患者室的内部产生磁场的磁体装置。驱动装置被操作以便以病人床的移动方向上的磁场分布确定的速度移动患者床。

9. 发明授权

US07719281B2 Method to control a magnetic resonance system with individually controllable RF transmission channels 有权
标题翻译：用单独控制的RF传输通道控制磁共振系统的方法
公开(公告)号：US07719281B2
公开(公告)日：2010-05-18
申请号：US12051923
申请日：2008-03-20
申请人： Joerg Ulrich Fontius , Marian Lattka , Juergen Nistler , Franz Schmitt
发明人： Joerg Ulrich Fontius , Marian Lattka , Juergen Nistler , Franz Schmitt
IPC分类号： G01V3/00
CPC分类号： G01R33/36 , G01R33/34046 , G01R33/3415 , G01R33/3607 , G01R33/5612 , G01R33/5659
摘要： In a method for controlling a magnetic resonance system having a radio-frequency antenna structure and a number of individually controllable transmission channels, respective parallel radio-frequency signals are emitted via the transmission channels for generation of a desired radio-frequency field distribution in at least one specific volume region within an examination volume of the magnetic resonance system. A digital signal is generated for each of the transmission channels and is modulated on a carrier frequency. The radio-frequency signal so generated is transmitted via a radio-frequency signal path to the radio-frequency antenna structure and is amplified therein in a radio-frequency power amplifier. The digital signal is manipulated in a characteristic curve correction device on the basis of a correction characteristic curve predetermined for the respective radio-frequency signal path such that a distortion of the radio-frequency signal caused in the appertaining radio-frequency signal path is at least partially compensated. Respective individual correction characteristic curves for a specific measurement are predetermined for the various transmission channels dependent on a field distribution parameter that defines the desired radio-frequency field distribution. A magnetic resonance system implements such a method.
摘要翻译：在一种用于控制具有射频天线结构和多个可独立控制的传输信道的磁共振系统的方法中，经由传输信道发射各自的并行射频信号，用于至少产生所需的射频场分布在磁共振系统的检查体积内的一个比体积区域。为每个传输信道生成数字信号，并在载波频率上进行调制。如此生成的射频信号经由射频信号路径发送到射频天线结构，并且在射频功率放大器中被放大。基于针对各个射频信号路径预定的校正特性曲线，在特性曲线校正装置中操作数字信号，使得在相应射频信号路径中引起的射频信号的失真至少为部分补偿。根据限定期望的射频场分布的场分布参数，针对各种传输信道预先确定特定测量的各自的校正特性曲线。磁共振系统实现这种方法。

10. 发明授权

US07622921B2 Method and device for monitoring radio-frequency exposure in a magnetic resonance measurement 有权
标题翻译：用于监测磁共振测量中射频暴露的方法和装置
公开(公告)号：US07622921B2
公开(公告)日：2009-11-24
申请号：US11965809
申请日：2007-12-28
申请人： Joerg Ulrich Fontius , Juergen Nistler , Wolfgang Renz , Franz Schmitt , Karsten Wicklow
发明人： Joerg Ulrich Fontius , Juergen Nistler , Wolfgang Renz , Franz Schmitt , Karsten Wicklow
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/288 , G01R33/5612
摘要： In a method and device for monitoring the physiologically effective radio-frequency exposure in at least one specific volume region of an examination subject in a magnetic resonance data acquisition scan in a magnetic resonance system, amplitude values are acquired that respectively represent, at specific acquisition points in time, a signal amplitude of the radio-frequency signals emitted or to be emitted via the radio-frequency signal channels. Also, phase values are acquired that represent the phases of the appertaining radio-frequency signals at these points in time. Local exposure values are then determined on the basis of the amplitude values and phase values, respectively representing a physiological exposure that the radio-frequency pulses cause at the examination subject at a specific location at a specific time. Based on this, exposure control values are determined that are compared with predetermined exposure limit values. When an exposure limit values is reached or exceeded, a control signal is output.
摘要翻译：在用于在磁共振系统的磁共振数据采集扫描中监测检查对象的至少一个特定体积区域中的生理上有效的射频暴露的方法和装置中，获取分别表示在特定采集点在时间上，经由射频信号信道发射或将要发射的射频信号的信号幅度。此外，获取代表在这些时间点处的无线电频率信号的相位的相位值。然后根据振幅值和相位值来确定本地曝光值，分别表示在特定时间在特定位置处的检查对象发生的射频脉冲引起的生理暴露。基于此，确定与预定曝光极限值进行比较的曝光控制值。当达到或超过曝光限制值时，输出控制信号。

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