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1. 发明授权

US07602188B2 System of electric coils for transmitting and receiving radio-frequency magnetic fields in a magnetic-resonance imaging apparatus, and magnetic-resonance imaging apparatus provided with such a system of electric coils 失效
标题翻译：用于在磁共振成像装置中发射和接收射频磁场的电线圈系统和具有这种电线圈系统的磁共振成像装置
公开(公告)号：US07602188B2
公开(公告)日：2009-10-13
申请号：US11572714
申请日：2005-07-12
申请人： Cecilia Possanzini , Marinus Johannes Adrianus Maria Van Helvoort , Jan Bertus Marten Warntjes , Robert Paul Kleihorst
发明人： Cecilia Possanzini , Marinus Johannes Adrianus Maria Van Helvoort , Jan Bertus Marten Warntjes , Robert Paul Kleihorst
IPC分类号： G01V3/00
CPC分类号： G01R33/341
摘要： The invention relates to a magnetic-resonance imaging (MRI) apparatus comprising an electrical coil system (17) for transmitting and receiving a radio-frequency (RF) magnetic field from an examination volume (3) of the MRI apparatus. The electrical coil system (17) comprises at least one surface coil (35) which extends substantially in a plane. The surface coil is used for transmitting and/or receiving a RF magnetic field which is oriented substantially perpendicularly to the plane of the surface coil (35). The surface coil (35) has a main coil axis (37). When the MRI apparatus is in use, the main coil axis (37) extends substantially parallel to a main magnetic field in the examination volume (3) of the MRI apparatus. On both sides of the main coil axis (37), the surface coil (35) comprises an electrically conducting element (39) which extends substantially parallel to the main coil axis (37). To provide a surface coil (35) which transmits more homogeneous RF magnetic fields and/or has a more homogeneous sensitivity for received RF magnetic fields than known surface coils, at least one of the electrically conducting elements (39) of the surface coil (35) comprises at least two electric conductors (41). With respect to their distance to the main coil axis (37), these electric conductors (41) are positioned at a relatively short distance from each other. In the plane of the surface coil (35), the electric conductors (41)extend substantially parallel to the main coil axis (37) of the surface coil (35).
摘要翻译：本发明涉及一种磁共振成像（MRI）装置，其包括用于从MRI装置的检查体积（3）发射和接收射频（RF）磁场的电线圈系统（17）。电线圈系统（17）包括基本上在平面中延伸的至少一个表面线圈（35）。表面线圈用于传输和/或接收基本上垂直于表面线圈（35）的平面定向的RF磁场。表面线圈（35）具有主线圈轴（37）。当使用MRI装置时，主线圈轴线（37）基本上平行于MRI装置的检查体积（3）中的主磁场延伸。在主线圈轴线（37）的两侧，表面线圈（35）包括基本上平行于主线圈轴线（37）延伸的导电元件（39）。为了提供表面线圈（35），所述表面线圈（35）传递更均匀的RF磁场和/或对已接收的RF磁场具有比已知表面线圈更均匀的灵敏度，表面线圈（35）的至少一个导电元件（39））包括至少两个电导体（41）。对于它们到主线圈轴线（37）的距离，这些电导体（41）位于彼此相对短的距离处。在表面线圈（35）的平面中，电导体（41）基本上平行于表面线圈（35）的主线圈轴线（37）延伸。

2. 发明授权

US07279898B2 MRI RF surface coil with reduced sensitivity in proximity of conductors 失效
公开(公告)号：US07279898B2
公开(公告)日：2007-10-09
申请号：US10560873
申请日：2004-06-21
申请人： Robert Paul Kleihorst , Jan Bertus Marten Warntjes
发明人： Robert Paul Kleihorst , Jan Bertus Marten Warntjes
IPC分类号： G01V3/00
CPC分类号： G01R33/3642 , G01R33/341
摘要： The invention relates to a radio-frequent (RF) coil system (17, 17′) for use in a magnetic resonance imaging (MRI) system. The RF coil system comprises at least one main coil (35) for transmitting an RF magnetic field (B1) into and/or receiving an RF magnetic field (B1′) from an examination volume (3) of the MRI system. The main coil has a main coil axis (37), which is or is to be oriented parallel to a main magnetic field (B0) in the examination volume, and at least one electrical conductor (39, 41) which extends mainly parallel to the main coil axis. According to the invention, the RF coil system comprises at least two electrical auxiliary coils (51, 53, 55, 57) which are assigned to said conductor of the main coil. The auxiliary coils are arranged on opposite sides of said conductor of the main coil. Each auxiliary coil has a coil axis (59, 61, 63, 65) which extends substantially parallel to the main coil axis at a distance from the conductor of the main coil to which the respective auxiliary coil is assigned, said distance being small relative to a main dimension (L) of the main coil. The auxiliary coils constitute passive electrical coils in which electrical currents are generated under the influence of an RF magnetic field (B11, B11′) present at the location of the auxiliary coils. The RF magnetic field (B12, B34) generated by the auxiliary coils as a result of said currents in the auxiliary coils suppresses said RF magnetic field present at the location of the auxiliary coils. Thus, the auxiliary coils provide a sensitivity reducing effect of the RF coil system in local regions (47, 49) which are at relatively small distances from the conductor of the main coil. For regions at a distance from the conductor of the main coil comparable to the main dimension of the main coil, said sensitivity reducing effect is negligible.

3. 发明授权

US07242192B2 RF surface coil for use in MRI with reduce sensitivity close to the conductors 失效
标题翻译： RF表面线圈用于MRI，降低灵敏度，靠近导体
公开(公告)号：US07242192B2
公开(公告)日：2007-07-10
申请号：US10555937
申请日：2004-05-05
申请人： Jan Bertus Marten Warntjes
发明人： Jan Bertus Marten Warntjes
IPC分类号： G01V3/00
CPC分类号： G01R33/341
摘要： The invention relates to a radio-frequent (RF) coil system (17, 17′) for use in a magnetic resonance imaging (MRI) system. The RF coil system comprises at least one main coil (35) for transmitting an RF magnetic field (B1) into and/or receiving an RF magnetic field (B1′) from an examination volume (3) of the MRI system. The main coil has a coil axis (36), which is or is to be oriented parallel to a main magnetic field (Bo) in the examination volume (3), and at least one electrical conductor (37, 39) which extends mainly parallel to the coil axis. According to the invention, the RF coil system comprises an auxiliary coil (45, 47) which is assigned to said conductor of the main coil. The auxiliary coil has two electrical conductors (49, 51) which extend mainly parallel to the coil axis and on opposite sides of said conductor of the main coil. A distance between the two conductors of the auxiliary coil and the conductor of the main coil is small relative to a main dimension (L) of the main coil. In transmission mode, RF signals are supplied to the main coil and to the auxiliary coil with such a mutual phase difference, that a combined RF magnetic field (Bc) of 15 the main coil and the auxiliary coil has a direction of rotation (RB) opposite to a direction of precession (Rp) of the spin axes of the spinning nuclei in a body to be examined. In receiving mode, a first RF signal received by the main coil and a second RF signal received by the auxiliary coil are combined and added at such a mutual phase difference, that the second RF signal suppresses the first RF signal. In this manner, the disadvantageous high local 20 sensitivity of the RF coil system for the local region (38, 40) adjoining said conductor of the main coil is strongly reduced.
摘要翻译：本发明涉及用于磁共振成像（MRI）系统的无线电频率（RF）线圈系统（17,17'）。 RF线圈系统包括用于从MRI系统的检查体积（3）传送RF磁场（B 1）和/或接收RF磁场（B 1'）的至少一个主线圈（35）。主线圈具有与检查体积（3）中的主磁场（Bo）平行的或将要取向的线圈轴（36），以及至少一个主要平行延伸的电导体（37,39）到线圈轴。根据本发明，RF线圈系统包括分配给主线圈的所述导体的辅助线圈（45,47）。辅助线圈具有主要平行于线圈轴线和主线圈的所述导体的相对侧延伸的两个电导体（49,51）。辅助线圈的两个导体与主线圈的导体之间的距离相对于主线圈的主尺寸（L）较小。在传输模式中，RF信号以这样的相位差提供给主线圈和辅助线圈，使得主线圈和辅助线圈的组合RF磁场（Bc）具有旋转方向（RB）与被检体内的纺丝核的旋转轴线的进动方向（Rp）相反。在接收模式中，由主线圈接收到的第一RF信号和由辅助线圈接收的第二RF信号以这样的相位差组合并相加，使得第二RF信号抑制第一RF信号。以这种方式，与主线圈的所述导体相邻的局部区域（38,40）的RF线圈系统的不利的高的局部20灵敏度被大大降低。

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