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    • 4. 发明公开
    • Transmission line apparatus for travelling wave MRI
    • ÜbertragungsleitungsvorrichtungfürWanderwellen-MRI
    • EP2500739A1
    • 2012-09-19
    • EP11158206.0
    • 2011-03-15
    • Deutsches KrebsforschungszentrumKarlsruher Institut für Technologie
    • Müller, MarcoUmathum, ReinerAlt, StefanBock, MichaelWerner, Wiesbeck
    • G01R33/345G01R33/48
    • G01R33/3453G01R33/3456G01R33/4802
    • A transmission line array (106, 106', 106") for magnetic resonance imaging of an object (100) to be imaged comprising a plurality of transmission line elements (118) is proposed, wherein the plurality of transmission line elements (118) are arranged in a generally cylindrical configuration having an arbitrarily chosen longitudinal (Z) length (108, 112, 124). Furthermore, a method for creating a radio-frequency excitation field for magnetic resonance imaging using a transmission line array (106, 106', 106") comprising transmission line elements (118) in a generally cylindrical configuration is proposed, wherein the method includes the steps:
      a) positioning said transmission line array (106, 106', 106") having an arbitrarily chosen longitudinal (Z) length around an object (100) to be imaged or selectively around a section of said object (100) to be imaged,
      b) coupling-in a radio-frequency signal to said transmission line array (106, 106', 106"),
      c) transmitting and/or receiving travelling radio-frequency waves through said transmission line array (106, 106', 106").
    • 提出一种传输线阵列(106,106',106“),用于对包含多个传输线元件(118)的成像对象(100)进行磁共振成像,其中多个传输线元件(118)是 布置成具有任意选择的纵向(Z)长度(108,112,124)的大致圆柱形构造。此外,使用传输线阵列(106,106',...)创建用于磁共振成像的射频激励场的方法, 提出了包括大致圆柱形结构的传输线元件(118)的方法,其中该方法包括以下步骤:a)将具有任意选择的纵向(Z)长度的所述传输线阵列(106,106',106“)定位 围绕要成像的所述物体(100)的一部分成像或选择性地围绕物体(100),b)将射频信号耦合到所述传输线阵列(106,106',106“),c )发送和/或接收travellin g的射频波通过所述传输线阵列(106,106',106“)。
    • 5. 发明申请
    • ANTENNA ASSEMBLY FOR ULTRA-HIGH FIELD MRI
    • 用于超声场MRI的天线装置
    • WO2012152618A1
    • 2012-11-15
    • PCT/EP2012/057990
    • 2012-05-02
    • DEUTSCHES KREBSFORSCHUNGSZENTRUMUMATHUM, Reiner
    • UMATHUM, Reiner
    • G01R33/3415G01R33/561
    • G01R33/3415G01R33/4802G01R33/5612
    • The invention relates to an antenna assembly (1) comprising at least one input port (10) and a plurality of antenna elements (20 - 24'). The plurality of antenna elements (20 - 24') is supplied by the at least one input port (10) via a circuitry (7). The antenna elements (20 - 24') are arranged along a circumference around an inner area (90) of the antenna assembly (1). At least two of the antenna elements (20 - 24') have distinct characteristic impedances. According to the invention, the impedance of an antenna element is varied with respect to that of another antenna element in order to achieve the desired spatial rf field distribution. The invention further relates to a radio transmitter (5) comprising at least one of the inventive antenna assemblies (1) as well as a RF source (11). In addition, the invention relates to a method for operating the inventive antenna assembly (1).
    • 本发明涉及一种包括至少一个输入端口(10)和多个天线元件(20-24')的天线组件(1)。 所述多个天线元件(20-24')由所述至少一个输入端口(10)经由电路(7)提供。 天线元件(20-24')沿着围绕天线组件(1)的内部区域(90)的圆周布置。 至少两个天线元件(20-24')具有明显的特征阻抗。 根据本发明,天线元件的阻抗相对于另一个天线元件的阻抗而变化,以便实现所需的空间射频场分布。 本发明还涉及包括本发明的天线组件(1)中的至少一个以及RF源(11)的无线电发射机(5)。 另外,本发明涉及一种用于操作本发明的天线组件(1)的方法。
    • 6. 发明申请
    • TRAVELING WAVE MRI IN HIGH BO FIELD STRENGTHS
    • 高波场强度旅行波
    • WO2012030548A1
    • 2012-03-08
    • PCT/US2011/048240
    • 2011-08-18
    • PRESIDENT AND FELLOWS OF HARVARD COLLEGEKIRULUTA, Andrew
    • KIRULUTA, Andrew
    • G01R33/48
    • G01R33/32G01R33/445G01R33/4802
    • In an MRI scanner, the transmission and reception of RF excitation and detected signal waves is accomplished using far field excitation instead of conventional near field excitation. By superimposing two counter-propagating waves from the same source in the MRI sample interference fringes are recorded in the sample in such a way that the relative phase between the two propagation wave vectors determines the periodicity of the maxima and minima in the interference fringe pattern. The complete fringe pattern, known as a spatial hologram, contains both the phase and amplitude information of the information-bearing wave. When exposed to a replica of the original reference wave, the fringe pattern acts as a diffraction grating, reproducing the information-bearing field propagating at the same relative phase.
    • 在MRI扫描仪中,RF激发和检测信号波的发射和接收使用远场激励而不是传统的近场激励来实现。 通过在MRI样本中叠加来自相同源的两个反向传播波,将干涉条纹记录在样本中,使得两个传播波矢量之间的相对相位确定干涉条纹图案中的最大值和最小值的周期性。 称为空间全息图的完整条纹图案包含信息承载波的相位和幅度信息。 当暴露于原始参考波的复制品时,条纹图案用作衍射光栅,再现在相同相对相位传播的信息承载场。