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    • 3. 发明专利
    • Method and apparatus for controlling magnetic resonance system
    • 用于控制磁共振系统的方法和装置
    • JP2014057861A
    • 2014-04-03
    • JP2013191042
    • 2013-09-13
    • Siemens Aktiengesellschaftシーメンス アクチエンゲゼルシヤフトSiemens Aktiengesellschaft
    • THERESA BACHSCHMIDTFAUTZ HANS-PETERGUMBRECHT RENEDOMINIK PAUL
    • A61B5/055G01R33/48
    • G01R33/4828G01R33/4833
    • PROBLEM TO BE SOLVED: To provide a method for controlling a magnetic resonance system, in which a fat signal can be appropriately separated from a water signal.SOLUTION: A method for controlling a magnetic resonance system for executing a first pulse sequence, includes an excitation step and an acquisition step. In the excitation step, a first gradient magnetic field is applied in a first gradient magnetic field direction in order to generate a space dependent magnetostatic field. A selective high-frequency excitation pulse is transmitted. While the selective high-frequency excitation pulse excites a first substance but does not excite a second substance in a first partial area 33 of an inspection volume 30, it does not excite the first substance but excites the second substance in a second partial area 36 of the inspection volume 30. In the acquisition step, a non-selective refocusing pulse is transmitted in order to acquire raw data on the first and second partial areas of the inspection volume through spatial encoding along the gradient magnetic field direction.
    • 要解决的问题:提供一种用于控制可以将脂肪信号与水信号适当地分离的磁共振系统的方法。解决方案:一种用于执行第一脉冲序列的磁共振系统的控制方法,包括激励 步骤和收购步骤。 在激励步骤中,以第一梯度磁场方向施加第一梯度磁场,以产生依赖于空间的静磁场。 选择性高频激励脉冲被发送。 虽然选择性高频激励脉冲激发第一物质但不在检查体积30的第一部分区域33中激发第二物质,但是其不激发第一物质,而是在第二部分区域36中激发第二物质 检测体积30.在采集步骤中,发送非选择性重聚焦脉冲,以通过沿着梯度磁场方向的空间编码在检查体积的第一和第二部分区域上获取原始数据。
    • 4. 发明专利
    • Method for determining pulse sequence to control drive of rf transmission coil, and magnetic resonance apparatus therefor
    • 用于确定脉冲序列以控制射频发射线圈的驱动的方法及其磁共振装置
    • JP2010000358A
    • 2010-01-07
    • JP2009146568
    • 2009-06-19
    • Siemens Agシーメンス アクチエンゲゼルシヤフトSiemens Aktiengesellschaft
    • DIEHL DIRKGUMBRECHT RENENISTLER JUERGENRENTZ WOLFGANGMARKUS FESTAWOLF SEBASTIAN
    • A61B5/055G01R33/36
    • G01R33/3415A61B5/055G01R33/288G01R33/4833G01R33/5612G01R33/5659
    • PROBLEM TO BE SOLVED: To provide a method with which ideal excitation pulses for achieving desired magnetizations can be determined even for large deflection angles, taking into account further (linear and non-linear) limitations (in particular SAR limitations). SOLUTION: 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 drive sequence, determined for multiple time steps of a pulse sequence, is specified for operating the gradient coils of the magnetic resonane apparatus to time-dependently select regions of a selected slice or a selected volume of a subject. A non-linear equation system is then solved to obtain drive parameters for individual transmit channels of the transmit coil for each time step, with specification of a desired target magnetization, and dependent on the drive 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 drive control parameters, includes at least one additional equation that describes boundary conditions for the examination of the subject. COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:考虑到进一步的(线性和非线性)限制(特别是SAR限制),提供一种即使对于大偏转角也可以确定用于实现所需磁化的理想激励脉冲的方法。 解决方案: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,规定了用于脉冲序列的多个时间步长确定的驱动序列,用于操作 磁共振装置的梯度线圈以时间依赖性地选择所选切片的区域或被检体的选定体积。 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发射通道的驱动参数,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驱动顺序。 非线性等式系统基于时间和空间变量的离散值,并且除了由Bloch方程产生的等式在其驱动控制参数中是非线性的方程之外,还包括至少一个附加的方程,其描述了用于 考试题目。 版权所有(C)2010,JPO&INPIT