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公开(公告)号：US20130241553A1
公开(公告)日：2013-09-19
申请号：US13882293
申请日：2011-10-26
CPC分类号： G01R33/36 , G01R33/246 , G01R33/44 , G01R33/5612 , G01R33/583
摘要： The invention relates to a method of characterizing the RF transmit chain of a magnetic resonance imaging scanner (1) using a local transmit/receive coil system (204; 210), comprising a first local NMR probe and a first local magnetic resonance coil, the first NMR probe being spatially located in immediate neighborhood to the first coil, a local receive coil system (206; 208), comprising a second local NMR probe and a second local magnetic resonance coil, the second NMR probe being spatially located in immediate neighborhood to the second coil, wherein the transmit chain comprises an external MR coil (9; 11; 12; 13), the method comprising: determining with the first magnetic resonance coil, a first MR signal phase evolution of the local RF transmit field generated by MR excitation of the first probe using the first magnetic resonance coil by measuring the RF response of the first probe upon said excitation, determining with the second magnetic resonance coil a second MR signal phase evolution of the local RF transmit field generated by MR excitation of the second probe using the external MR coil (9; 11; 12; 13) by measuring the RF response of the second probe upon said excitation, calculating a phase offset between the first and second MR signal phase evolution.
摘要翻译： 本发明涉及一种使用本地发射/接收线圈系统（204; 210）来表征磁共振成像扫描仪（1）的RF发射链的方法，该系统包括第一局部NMR探针和第一局部磁共振线圈， 空间上位于第一线圈周围的第一NMR探针，包括第二局部NMR探针和第二局部磁共振线圈的局部接收线圈系统（206; 208），所述第二NMR探针在空间上位于紧邻附近 所述第二线圈，其中所述发射链包括外部MR线圈（9; 11; 12; 13），所述方法包括：利用所述第一磁共振线圈确定由MR产生的所述本地RF发射场的第一MR信号相位演变 通过在所述激发时测量第一探针的RF响应，使用第一磁共振线圈激发第一探针，用第二磁共振线圈确定第二MR信号相位ev 使用外部MR线圈（9; 9）对第二探针的MR激发产生的局部RF发射场的清零。 11; 12; 13）通过在所述激励时测量第二探针的RF响应，计算第一和第二MR信号相位演变之间的相位偏移。
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公开(公告)号：US07642782B2
公开(公告)日：2010-01-05
申请号：US12091308
申请日：2006-10-03
申请人： Peter Vernickel , Ingmar Graesslin
发明人： Peter Vernickel , Ingmar Graesslin
IPC分类号： G01V3/00
CPC分类号： G01R33/365
摘要： A magnetic resonance imaging system includes a coupling compensation processor (70) for compensating induced magnetic coupling between n individual coil segments (38) of a coil arrangement (36). An adjusted signal determining device (74) determines an adjusted input signal for each of the n individual coil segments of the coil arrangement (36). A transmitting system (54) creates RF pulses in accordance with the determined adjusted input signals and transmits the RF pulses to corresponding coil segments such that the transmitted RF pulses compensate for coupling between the coil segments (38) in the digital domain.
摘要翻译： 磁共振成像系统包括用于补偿线圈装置（36）的n个单独线圈段（38）之间的感应磁耦合的耦合补偿处理器（70）。 调整信号确定装置（74）确定线圈装置（36）的n个单独线圈段中的每一个的经调整的输入信号。 发射系统（54）根据确定的调整的输入信号产生RF脉冲，并将RF脉冲发送到相应的线圈段，使得发送的RF脉冲补偿数字域中的线圈段（38）之间的耦合。
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23.发明申请Efficient mapping of reconstruction algorithms for magnetic resonance imaging onto a reconfigurable reconstruction system 审中-公开将磁共振成像的重建算法有效映射到可重构的重建系统上公开(公告)号：US20060238195A1
公开(公告)日：2006-10-26
申请号：US10565289
申请日：2004-07-16
申请人： Ingmar Graesslin , Holger Eggers
发明人： Ingmar Graesslin , Holger Eggers
CPC分类号： G01R33/3621 , G01R33/3415 , G01R33/54 , G01R33/5608
摘要： A magnetic resonance (MR) system (10) includes radiofrequency (R) transmitters (34) which send RF pulses into an examination region (14) to excite a spin system to be imaged. Coil elements (20, 24, 28) pick up an MR signal, which is demodulated and converted into digital data by RF receivers (36). A plurality of independent parallel processing channels (421, 422, . . . , 42a) is operatively connected to the RF receivers to reconstruct images from the digital data. The parallel processing channels (421, 422, . . . , 42n) include one or more pipeline stages (541, 542, . . . , 54m). Processing channels and pipeline stages include a plurality of processing or reconstruction units (52). Processing tasks are dynamically allocated to these processing or reconstruction units on a per scan basis using a single general strategy for mapping processing tasks to hardware resources. The connections (56) between the processing or reconstruction units (52) are reconfigured using a switching means (60). In this manner, different numbers of coil elements (20, 24, 28) can be connected with matching numbers of processing channels (421, 422, . . . , 42n) to exploit available processing resources optimally.
摘要翻译： 磁共振（MR）系统（10）包括射频（R）发射器（34），其将RF脉冲发送到检查区域（14）中以激发要成像的旋转系统。 线圈元件（20,24,28）拾取MR信号，其由RF接收器（36）解调并转换成数字数据。 多个独立的并行处理通道（42 1，...，42 2，...，42）一起可操作地连接到RF接收器 从数字数据重建图像。 并行处理通道（42 1，42 2，...，42 N）包括一个或多个流水线级（54 < 54 2，...，54 m）。 处理通道和流水线级包括多个处理或重建单元（52）。 使用用于将处理任务映射到硬件资源的单一一般策略，每个扫描基础上将处理任务动态地分配给这些处理或重建单元。 使用切换装置（60）来重新配置处理或重构单元（52）之间的连接（56）。 以这种方式，可以将不同数量的线圈元件（20,24,28）与匹配数量的处理通道（42 1，42 2，...， 以最佳地利用可用的处理资源。
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24.发明授权Method and circuit arrangement for operating multi-channel transmit/receive antenna devices 有权用于操作多通道发射/接收天线装置的方法和电路装置公开(公告)号：US07615999B2
公开(公告)日：2009-11-10
申请号：US11912685
申请日：2006-04-24
IPC分类号： G01V3/00
CPC分类号： G01R33/3607 , G01R33/288 , G01R33/5612 , G01R33/5659
摘要： Methods and circuit arrangements for operating a multi-channel transmit/receive antenna device or arrangement, especially for use in a magnetic resonance imaging (MRI) system, are disclosed by which RF amplifiers can be used to their full peak power capability without running the risk that the RF amplifier is damaged due to excessive reflected power at its output. Furthermore by evaluating certain forward and reflected power signals patient safety is achieved with respect to monitoring the limits of the specific absorption rate.
摘要翻译： 公开了用于操作多通道发射/接收天线装置或装置的方法和电路装置，特别是用于磁共振成像（MRI）系统中的哪些RF放大器可以被用于其全峰功率能力而不运行风险 RF放大器由于其输出处的反射功率过大而损坏。 此外，通过评估某些正向和反射功率信号，在监测比吸收率的限制方面实现了患者的安全性。
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25.发明授权公开(公告)号：US07615997B2
公开(公告)日：2009-11-10
申请号：US12091303
申请日：2006-10-03
IPC分类号： G01V3/00
CPC分类号： G01R33/3635
摘要： A medical imaging system (2) excites multiple nuclei through a single RF amplifier (24). The medical imaging system (2) includes a magnet (10) that generates a main magnetic field (Bo) in an examination region. A gradient coil (14) superimposes magnetic field gradients (G) on the main magnetic field Bo. At least one transmitter (28) generates multi-nuclei excitation pulses associated with at least two different isotopes and two different frequency spectra. The single amplifier (24) sends the multi-nuclei excitation pulses to a RF coil (18, 20) for application to the examination region.
摘要翻译： 医学成像系统（2）通过单个RF放大器（24）激发多个核。 医疗成像系统（2）包括在检查区域中产生主磁场（Bo）的磁体（10）。 梯度线圈（14）将磁场梯度（G）叠加在主磁场Bo上。 至少一个发射器（28）产生与至少两个不同同位素和两个不同频谱相关联的多核激励脉冲。 单个放大器（24）将多核激励脉冲发送到RF线圈（18,20）以供应用于检查区域。
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26.发明申请Method And Circuit Arragement For Operating Multi-Channel Transmit/Recieve Antenna Devices 有权操作多通道发射/接收天线设备的方法和电路管理公开(公告)号：US20080182524A1
公开(公告)日：2008-07-31
申请号：US11912684
申请日：2006-04-27
IPC分类号： H04B1/38
CPC分类号： G01R33/5612 , G01R33/288 , G01R33/3415 , G01R33/3607 , H04B17/23 , H04W52/34 , H04W52/367
摘要： Methods and circuit arrangements for operating a multi-channel transmit/receive antenna device or arrangement, comprising a power monitoring unit, especially for use in a magnetic resonance imaging (MRI) system are disclosed. These methods and circuit arrangements are especially provided for ensuring that a specific absorption rate of a patient is not exceeded in the case in which antenna devices or arrangements are used which comprise a plurality of coils and/or coil segments which are independently supplied with RF transmit signals with different amplitudes and/or phases and/or waveforms and/or power levels. A maximum power level is set for at least one of the transmit channels. An alarm state is activated if the supplied power level or the reflected power for that channel exceeds the maximum power level. A maximum sum power level is set for a plurality of transmit channels. An alarm state is activated if the supplied sum power level or the reflected sum power level for the plurality of transmit channels exceeds the maximum sum power level.
摘要翻译： 公开了用于操作多通道发射/接收天线装置或装置的方法和电路装置，其包括特别用于磁共振成像（MRI）系统的功率监测单元。 特别提供了这些方法和电路装置，用于确保在使用天线装置或布置的情况下不超过患者的比吸收率，所述天线装置或布置包括多个线圈和/或线圈段，这些线圈和/或线圈段独立地提供有RF发射 具有不同幅度和/或相位和/或波形和/或功率电平的信号。 为至少一个发送信道设置最大功率电平。 如果提供的功率电平或该通道的反射功率超过最大功率电平，则激活报警状态。 为多个发送信道设置最大和功率电平。 如果提供的总功率电平或多个发射信道的反射和功率电平超过最大和功率电平，则激活报警状态。
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公开(公告)号：US09575146B2
公开(公告)日：2017-02-21
申请号：US13882293
申请日：2011-10-26
IPC分类号： G01R33/36 , G01R33/24 , G01R33/44 , G01R33/561 , G01R33/58
CPC分类号： G01R33/36 , G01R33/246 , G01R33/44 , G01R33/5612 , G01R33/583
摘要： The invention relates to a method of characterizing the RF transmit chain of a magnetic resonance imaging scanner (1) using a local transmit/receive coil system (204; 210), comprising a first local NMR probe and a first local magnetic resonance coil, the first NMR probe being spatially located in immediate neighborhood to the first coil, a local receive coil system (206; 208), comprising a second local NMR probe and a second local magnetic resonance coil, the second NMR probe being spatially located in immediate neighborhood to the second coil, wherein the transmit chain comprises an external MR coil (9; 11; 12; 13), the method comprising: determining with the first magnetic resonance coil, a first MR signal phase evolution of the local RF transmit field generated by MR excitation of the first probe using the first magnetic resonance coil by measuring the RF response of the first probe upon said excitation, determining with the second magnetic resonance coil a second MR signal phase evolution of the local RF transmit field generated by MR excitation of the second probe using the external MR coil (9; 11; 12; 13) by measuring the RF response of the second probe upon said excitation, calculating a phase offset between the first and second MR signal phase evolution.
摘要翻译： 本发明涉及一种使用本地发射/接收线圈系统（204; 210）来表征磁共振成像扫描仪（1）的RF发射链的方法，该系统包括第一局部NMR探针和第一局部磁共振线圈， 空间上位于第一线圈周围的第一NMR探针，包括第二局部NMR探针和第二局部磁共振线圈的局部接收线圈系统（206; 208），所述第二NMR探针在空间上位于紧邻附近 所述第二线圈，其中所述发射链包括外部MR线圈（9; 11; 12; 13），所述方法包括：利用所述第一磁共振线圈确定由MR产生的所述本地RF发射场的第一MR信号相位演变 通过在所述激发时测量第一探针的RF响应，使用第一磁共振线圈激发第一探针，用第二磁共振线圈确定第二MR信号相位ev 使用外部MR线圈（9; 9）对第二探针的MR激发产生的局部RF发射场的清零。 11; 12; 13）通过在所述激励时测量第二探针的RF响应，计算第一和第二MR信号相位演变之间的相位偏移。
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公开(公告)号：US08334692B2
公开(公告)日：2012-12-18
申请号：US11993028
申请日：2006-06-21
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/3635
摘要： A magnetic resonance (MR) device for magnetic resonance imaging of a body placed in an examination volume includes a main magnet or generating a stationary and substantially homogeneous main magnetic field in the examination volume, and an RF coil arrangement for generating RF fields in the examination volume and/or for receiving MR signals from the body. In order to provide such an MR device, which is arranged to operate at the resonance (Larmor) frequencies of two or more different nuclear species at the same time, the RF coil arrangement includes independent resonator elements which are adjacently arranged in or near the examination volume. The adjacent resonator elements are alternately tuned to one of two or more different MR resonance frequencies, and each resonator element is associated with a separate signal transmission and/or signal reception channel of the MR device.
摘要翻译： 用于放置在检查体积中的身体的磁共振成像的磁共振（MR）装置包括主磁体或在检查体积中产生静止且基本均匀的主磁场，以及用于在检查中产生RF场的RF线圈装置 体积和/或用于从身体接收MR信号。 为了提供这样的MR器件，其被布置成在两个或更多个不同核物种的共振（Larmor）频率同时操作，RF线圈装置包括相邻布置在检查中或附近的独立谐振元件 卷。 相邻的谐振器元件被交替调谐到两个或多个不同的MR谐振频率中的一个，并且每个谐振器元件与MR器件的单独的信号传输和/或信号接收通道相关联。
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公开(公告)号：US20100256477A1
公开(公告)日：2010-10-07
申请号：US11993028
申请日：2006-06-21
IPC分类号： A61B5/055
CPC分类号： G01R33/3415 , G01R33/3635
摘要： The invention relates to an MR device (1) for magnetic resonance imaging of a body (14) placed in an examination volume (7), the device (1) comprising a main magnet (2) for generating a stationary and substantially homogeneous main magnetic field in the examination volume (7), and an RF coil arrangement for generating RF fields in the examination volume (7) and/or for receiving MR signals from the body (14). In order to provide such an MR device, which is arranged to operate at the resonance (Larmor) frequencies of two or more different nuclear species at the same time, the invention suggests that the RF coil arrangement comprises a plurality of independent resonator elements (8, 9, 10, 11, 12, 13) which are adjacently arranged in or near the examination volume (7), wherein adjacent resonator elements (8, 9, 10, 11, 12, 13) are alternately tuned to one of two or more different MR resonance frequencies, and wherein each resonator element (8, 9, 10, 11, 12, 13) is associated with a separate signal transmission (16) and/or signal reception channel (17) of the MR device (1)
摘要翻译： 本发明涉及用于放置在检查体积（7）中的体（14）的磁共振成像的MR装置（1），所述装置（1）包括主磁体（2），用于产生静止且基本均匀的主磁 在检查体积（7）中的场和用于在检查体积（7）中产生RF场和/或用于从身体（14）接收MR信号的RF线圈装置。 为了提供这样的MR器件，其被布置为在同时在两个或更多个不同核物质的共振（Larmor）频率下操作，本发明提出RF线圈装置包括多个独立的谐振器元件（8 ，9,10,11,12,13），其相邻地布置在检查体积（7）中或附近，其中相邻的谐振器元件（8,9,10,11,12,13）交替地被调谐到两个或 更多不同的MR谐振频率，并且其中每个谐振器元件（8,9,10,11,12,13）与MR装置（1）的单独的信号传输（16）和/或信号接收通道（17）相关联，
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公开(公告)号：US20100141257A1
公开(公告)日：2010-06-10
申请号：US12598454
申请日：2008-04-03
IPC分类号： G01R33/44
CPC分类号： G01R33/3607
摘要： A method and an RF transmit system for generating RF transmit signals for feeding an RF transmitter (14) in the form of, or comprising, one or more antenna device(s), coil(s), coil elements, or coil array(s) is disclosed. Furthermore, a multi-channel RF transmit system for feeding a plurality of such RF transmitters, especially for use as an RF excitation system in a magnetic resonance imaging (MRI) system for exciting nuclear magnetic resonances (NMR) is disclosed. A demand RF transmit signal is compared in the digital domain with an RF transmit signal and digitally corrected with respect to differences or errors between both by means of a complex predistorter (11), an adaption unit (17) and a look-up table unit (18).
摘要翻译： 一种用于产生RF发射信号的方法和RF发射系统，用于馈送以一种或多种天线装置，线圈，线圈元件或线圈阵列形式的RF发射器（14）的形式或包括一个或多个天线装置 ）被公开。 此外，公开了用于馈送多个这样的RF发射器的多通道RF发射系统，特别是用作用于激励核磁共振（NMR）的磁共振成像（MRI）系统中的RF激励系统。 数字域中的需求RF发射信号与RF发射信号进行比较，并且通过复数预失真器（11），适配单元（17）和查找表单元（21）对二者之间的差异或误差进行数字校正 （18）。
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