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    • 42. 发明申请
    • OPTICAL DECOUPLING, TUNING AND SHIMMING OF MAGNETIC RESONANCE COILS
    • 磁共振线圈的光学解耦,调谐和调光
    • WO2006097888A1
    • 2006-09-21
    • PCT/IB2006/050779
    • 2006-03-13
    • KONINKLIJKE PHILIPS ELECTRONICS, N.V.U.S. PHILIPS CORPORATIONWEISS, Steffen
    • WEISS, Steffen
    • G01R33/34
    • G01R33/3692G01R33/34046G01R33/3628G01R33/3642
    • A magnetic resonance imaging system (10) includes a transmit coil (22) and one or more receive coils (32). The transmit coil includes one or more circuit segments (44, 44, 80, 90) including a light-sensitive metal-insulator-semiconductor capacitor (50) which is connected by an optic fiber to one of a plurality of variable light sources (68). In the set-up mode, the transmit coil transmits RF pulses into an examination region (14). A plurality of the receive coils are disposed around the imaging region. The tuning processor (60) analyzes the received RF fields from around the imaging region and determines adjustments to the amount of light transmitted to each light-sensitive capacitor to shim or tune the transmit coil to optimize RF field homogeneity. Further, the receive coils (32') include a light-sensitive capacitor whose illumination is changed during RF transmission to detune the receive coil.
    • 磁共振成像系统(10)包括发射线圈(22)和一个或多个接收线圈(32)。 发射线圈包括一个或多个包括光敏金属 - 绝缘体 - 半导体电容器(50)的电路段(44,44,80,90),该光敏金属 - 绝缘体 - 半导体电容器(50)通过光纤连接到多个可变光源(68 )。 在建立模式中,发送线圈将RF脉冲发送到检查区域(14)。 多个接收线圈设置在成像区域周围。 调谐处理器(60)从成像区域周围分析接收到的RF场,并且确定对传输到每个光敏电容器的光量的调整,以便对发射线圈进行垫片或调谐以优化RF场均匀性。 此外,接收线圈(32')包括感光电容器,其光照在RF传输期间被改变以使接收线圈失谐。
    • 44. 发明申请
    • ELECTRO-OPTICAL MAGNETIC RESONANCE TRANSDUCER
    • 电光磁共振传感器
    • WO2005103747A1
    • 2005-11-03
    • PCT/IB2005/051069
    • 2005-03-30
    • KONINKLIJKE PHILIPS ELECTRONICS, N.V.U.S. PHILIPS CORPORATIONWEISS, SteffenNIELSEN, Tim
    • WEISS, SteffenNIELSEN, Tim
    • G01R33/28
    • G01R33/287G01R33/34084G01R33/36G01R33/3621G01R33/3692
    • A receive coil (46, 46', 46") receiving a magnetic resonance signal includes an optical resonant cavity (82, 82', 82") having an electro-optically active medium (90, 90', 90"). A radio frequency antenna (80, 80', 80") is coupled with the electro-optically active medium such that reception of the magnetic resonance signal by the radio frequency antenna modulates an optical characteristic of the optical resonant cavity. An interventional instrument (48) is adapted for partial insertion into an associated imaging subject (16). The radio frequency antenna and the optical resonant cavity are disposed on a portion of the interventional instrument that is inserted into the associated imaging subject. At least one optical fiber (52, 54) is optically coupled with the optical resonant cavity. An end of the at least one optical fiber extends outside of the associated imaging subject when the interventional instrument is partially inserted.
    • 接收磁共振信号的接收线圈(46,46',46“)包括具有电光活性介质(90,90',90”)的光学谐振腔(82,82',82“)。 高频天线(80,80',80“)与电光活性介质耦合,使得由射频天线接收磁共振信号调制光谐振腔的光学特性。 介入器械(48)适于部分地插入到相关联的成像对象(16)中。 无线电频率天线和光学谐振腔被布置在插入到相关联的成像对象中的介入仪器的一部分上。 至少一个光纤(52,54)与光学谐振腔光学耦合。 当介入器械被部分地插入时,至少一个光纤的一端延伸到相关的成像对象的外部。
    • 48. 发明申请
    • RF-SAFE INVASIVE DEVICE
    • 射频安全入侵设备
    • WO2003010551A1
    • 2003-02-06
    • PCT/IB2002/002812
    • 2002-07-19
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.
    • WEISS, SteffenLUEDEKE, Kai-Michael
    • G01R33/28
    • G01R33/285
    • RF-safe invasive device which is intended to cooperate with a magnetic resonance imaging apparatus and which contains at least one long conductor (20) for a specific purpose, e.g., the localization of the RF-safe device in an object under test. It is known that in such devices with long conductors during RF transmission of the magnetic resonance apparatus a standing RF wave along the conductors may build up which causes dangerous heating of the device and surrounding tissue. Heating of the conductor and surrounding tissue is avoided by means of at least one series element of (18) controllable impedance incorporated into the long conductor where the impedance of the series element (18) is controlled by a control unit (16) such that during the RF transmission the series elements (18) subdivide the long conductor (20) into sections substantially shorter than half the wavelength in tissue of the RF used.
    • 射频安全入侵设备旨在与磁共振成像设备配合,并且其包含用于特定目的的至少一个长导体(20),例如将RF安全设备定位在被测对象中。 众所周知,在磁共振设备的射频传输期间,在具有长导体的这种器件中,沿着导体的直立RF波可能积聚,这导致器件和周围组织的危险加热。 通过(18)可控阻抗的至少一个串联元件避免了导体和周围组织的加热,该串联元件并入到长导体中,其中串联元件(18)的阻抗由控制单元(16)控制,使得在 串联元件(18)的RF传输将长导体(20)细分成基本短于使用的RF的组织中的波长的一半。