公开(公告)号：US20080231274A1

公开(公告)日：2008-09-25

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： G01R33/483

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。

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。