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公开(公告)号：US06518760B2
公开(公告)日：2003-02-11
申请号：US09918160
申请日：2001-07-30
申请人： Miha Fuderer , Johan Samuel Van Den Brink , Michel Paul Jurriaan Jurrissen , Arianne Margarethe Corinne Van Muiswinkel , Ulrich Katscher
发明人： Miha Fuderer , Johan Samuel Van Den Brink , Michel Paul Jurriaan Jurrissen , Arianne Margarethe Corinne Van Muiswinkel , Ulrich Katscher
IPC分类号： G01V300
CPC分类号： G01R33/5611 , G01R33/4835
摘要： A magnetic resonance imaging method employs sub-sampled signal acquisition from a number of receiver coils such as surface coils. A full field-of-view magnetic resonance image is reconstructed on the basis of the sensitivity profiles of the receiver coils, for example on the basis of the SENSE technique. The reconstruction is carried out mathematically as an optimization, for example, requiring a minimum noise level in the magnetic resonance image. According to the invention, a priori information is also involved in the reconstruction and the a priori information is taken into account especially as a constraint in optimization.
摘要翻译： 磁共振成像方法采用来自多个接收线圈（例如表面线圈）的子采样信号采集。 基于接收器线圈的灵敏度分布，例如基于SENSE技术，重建完整的视场磁共振图像。 重建在数学上进行为优化，例如要求磁共振图像中的最小噪声电平。 根据本发明，先验信息也涉及重建，并且先验信息被特别地考虑在优化中作为约束。
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公开(公告)号：US06828790B2
公开(公告)日：2004-12-07
申请号：US10224049
申请日：2002-08-20
IPC分类号： G01V300
CPC分类号： G01R33/446 , G01R33/3415 , G01R33/4616 , G01R33/5611
摘要： A magnetic resonance imaging system comprises an excitation antennae system (13,16) including several antennae for emitting an RF-excitation field [B1(t)]. An activation control unit (ACU) is coupled to the excitation antennae system to activate the excitation antennae system. Individual antennae are activated to simultaneously emit separate RF-excitation constituents [Bn(t)]. The RF-excitation constituents have different activation distributions over k-space. and the time required for the RF-excitation is short even for complex spatial excitation patterns.
摘要翻译： 磁共振成像系统包括激励天线系统（13,16），其包括用于发射RF激励场[B1（t）]的几个天线。 激活控制单元（ACU）耦合到激励天线系统以激活激励天线系统。 单独的天线被激活以同时发射单独的RF激发成分[Bn（t）]。 RF激发成分在k空间上具有不同的激活分布。 即使对于复杂的空间激励模式，RF激发所需的时间也很短。
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公开(公告)号：US08938281B2
公开(公告)日：2015-01-20
申请号：US13496085
申请日：2010-09-27
IPC分类号： A61B5/05 , G01R33/561 , G01R33/565
CPC分类号： G01R33/5612 , G01R33/246 , G01R33/5659
摘要： The invention relates to a magnetic resonance imaging apparatus including an array of two or more RF antennas for transmitting RF pulses to and receiving MR signals from a subject positioned in an examination volume, and where the RF antennas have spatial transmit and receive sensitivity profiles. The apparatus is configured to control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna. The apparatus is also configured to determine the phases and amplitudes from the spatial transmit sensitivity profiles of the RF antennas, and reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas and from the spatial receive sensitivity profiles of the RF antennas. Further, the apparatus is configured to determine the spatial transmit sensitivity profiles of the RF antennas from the spatial receive sensitivity profiles of the RF antennas, or vice versa.
摘要翻译： 本发明涉及一种磁共振成像设备，包括两个或更多个RF天线的阵列，用于将RF脉冲发送到定位在检查体积中的被摄体并接收MR信号，并且其中RF天线具有空间发射和接收灵敏度分布。 该装置被配置为控制每个单独RF天线的RF馈送的时间连续性，相位和幅度。 该装置还被配置为根据RF天线的空间发射灵敏度分布来确定相位和振幅，并且从经由各个RF天线接收的接收的MR信号和从RF天线的空间接收灵敏度分布的组合重建MR图像 射频天线。 此外，该装置被配置为根据RF天线的空间接收灵敏度分布来确定RF天线的空间发射灵敏度分布，反之亦然。
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公开(公告)号：US20120179023A1
公开(公告)日：2012-07-12
申请号：US13496085
申请日：2010-09-27
IPC分类号： A61B5/055
CPC分类号： G01R33/5612 , G01R33/246 , G01R33/5659
摘要： The invention relates to a magnetic resonance imaging apparatus comprising an array of two or more RF antennas (9) for transmitting RF pulses to and receiving MR signals from a body (7) of a patient positioned in an examination volume (2), the RF antennas (9) having spatial transmit and receive sensitivity profiles. The apparatus is arranged to: control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna (9), the phases and amplitudes being determined from the spatial transmit sensitivity profiles of the RF antennas (9), and reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas (9) and from the spatial receive sensitivity profiles of the RF antennas (9). The invention proposes that the apparatus is further arranged to: determine the spatial transmit sensitivity profiles of the RF antennas (9) from the spatial receive sensitivity profiles of the RF antennas (9), or determine the spatial receive sensitivity profiles of the RF antennas (9) from the spatial transmit sensitivity profiles of the RF antennas (9).
摘要翻译： 本发明涉及一种磁共振成像设备，其包括用于向位于检查体积（2）中的患者的身体（7）发送RF脉冲并从其接收MR信号的两个或更多个RF天线（9）的阵列，RF 天线（9）具有空间发射和接收灵敏度分布。 该装置被设置为：控制每个单独RF天线（9）的RF馈送的时间连续性，相位和幅度，根据RF天线（9）的空间发射灵敏度分布确定相位和幅度， 并且从经由各个RF天线（9）接收的接收的MR信号和RF天线（9）的空间接收灵敏度分布的组合重建MR图像。 本发明提出，该装置还被布置为：根据RF天线（9）的空间接收灵敏度分布来确定RF天线（9）的空间发射灵敏度分布，或者确定RF天线的空间接收灵敏度分布（ 9）从RF天线（9）的空间发射灵敏度分布图。
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公开(公告)号：US07403005B2
公开(公告)日：2008-07-22
申请号：US10597060
申请日：2005-01-05
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5608 , G01R33/5611
摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.
摘要翻译： 磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。 每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。 展开处理器（66）展开折叠的图像。 正规化图像正规化展开。
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公开(公告)号：US20070182412A1
公开(公告)日：2007-08-09
申请号：US10597060
申请日：2005-01-05
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5608 , G01R33/5611
摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.
摘要翻译： 磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。 每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。 展开处理器（66）展开折叠的图像。 正规化图像正规化展开。
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7.发明申请REDUCING THE RADIO-FREQUENCY TRANSMIT FIELD IN A PREDETERMINED VOLUME DURING MAGNETIC RESONANCE IMAGING 有权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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8.发明授权RF shimming with RF power regularization using a multi-channel RF transmit system for MRI 失效使用多通道RF传输系统进行RF功率正弦化的RF匀场扫描公开(公告)号：US08686726B2
公开(公告)日：2014-04-01
申请号：US13063477
申请日：2009-09-15
申请人： Ulrich Katscher , Ingmar Graesslin
发明人： Ulrich Katscher , Ingmar Graesslin
IPC分类号： G01R33/44
CPC分类号： G01R33/3415 , G01R33/288 , G01R33/5612 , G01R33/5659
摘要： A magnetic resonance system includes a magnetic resonance scanner having a multi-channel RF transmit system; an RF shimming processor configured to compute complex amplitude values for operative channels of the multi-channel RF transmit system based on a figure-of-merit including a weighted combination of a B1 uniformity measure and a total power measure. An RF transmit sub-system is configured to drive the multi-channel RF transmit system to excite magnetic resonance using the complex amplitude values computed by the RF shimming processor for the operative channels of the multi-channel RF transmit system.
摘要翻译： 磁共振系统包括具有多通道RF传输系统的磁共振扫描器; RF匀场处理器，被配置为基于包括B1均匀度测量和总功率测量的加权组合的品质因数来计算多声道RF发射系统的操作信道的复振幅值。 RF发射子系统被配置为驱动多声道RF发射系统以使用由RF匀场处理器为多声道RF发射系统的操作信道计算的复振幅值来激励磁共振。
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9.发明申请METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE 有权计算核磁共振中局部特定能量吸收率（SAR）的方法公开(公告)号：US20120262174A1
公开(公告)日：2012-10-18
申请号：US13514611
申请日：2010-12-28
IPC分类号： G01R33/483 , G01R33/34
CPC分类号： G01R33/288 , G01R33/246 , G01R33/443 , G01R33/543 , G01R33/546 , G01R33/5608
摘要： A method for calculating a local specific energy absorption rate (SAR) on basis of an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan. The magnetic field mapping method based on a magnetic resonance scan can be a Bi mapping method. The invention also relates to a magnetic resonance system by means of which SAR calculation can be done in a relatively short period of time. The invention also relates to a computer program comprising instructions for calculating a local specific energy absorption rate (SAR) according to the above mentioned method. The SAR calculation used in the above mentioned method, system and program is done in the relatively short period of time and as such is practicable in a clinical setting.
摘要翻译： 一种用于根据电参数和物体的分段几何形状的质量密度和射频（RF）天线的磁场矢量分布来计算局部比能吸收率（SAR）的方法。 电参数和质量密度的值是预定值，而通过基于磁共振（MR）扫描的磁场映射方法来估计磁场矢量分布。 基于磁共振扫描的磁场映射方法可以是Bi映射方法。 本发明还涉及一种磁共振系统，通过该系统可以在相对较短的时间内进行SAR计算。 本发明还涉及一种包括根据上述方法计算局部比能吸收率（SAR）的指令的计算机程序。 上述方法，系统和程序中使用的SAR计算在相对较短的时间内完成，因此在临床环境中可行。
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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，...）。
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