公开(公告)号：US20080054903A1

公开(公告)日：2008-03-06

申请号：US11572714

申请日：2005-07-12

申请人： Cecilia Possanzini ,  Marinus Johannes Adrianus Van Helvoort ,  Jan Warntjes ,  Robert Kleihorst

发明人： Cecilia Possanzini ,  Marinus Johannes Adrianus Van Helvoort ,  Jan Warntjes ,  Robert Kleihorst

IPC分类号： G01R33/341

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-frequent (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 substantially extends in a plane. The surface coil serves for transmitting and/or receiving an RF magnetic field which is substantially oriented perpendicular 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 electrical conductors (41). With respect to their distance to the main coil axis (37) these electrical conductors (41) are positioned at a relatively short distance from each other. In the plane of the surface coil (35) the electrical conductors (41) substantially extend 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MRI装置使用时，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（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。

公开(公告)号：US20070096736A1

公开(公告)日：2007-05-03

申请号：US10560873

申请日：2004-06-21

申请人： Robert Kleihorst ,  Jan Warntjes

发明人： Robert Kleihorst ,  Jan 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.

公开(公告)号：US20050116711A1

公开(公告)日：2005-06-02

申请号：US10508220

申请日：2003-02-25

申请人： Robert Kleihorst ,  Eerke Holle ,  Andreas Snelders

发明人： Robert Kleihorst ,  Eerke Holle ,  Andreas Snelders

IPC分类号： A61B5/055 ,  G01R33/36 ,  H03H7/48 ,  G01V3/00

CPC分类号： G01R33/3628 ,  H03H7/48

摘要： A combiner/splitter device (100) comprises two transmission lines (23, 24), wound to form a helical coil (55), this helical coil being bent to a toroidal shape. Furthermore, a capacitor (51) is provided, connected in parallel with the two outer conductors (25, 26) of the two transmission lines (23, 24). The combination of the wound transmission lines and said capacitor forms a parallel resonator (56). The combiner/splitter device is suitable for use in a magnetic resonance imaging (MRI) system to combine the output signals of a receiver coil system and/or to split the input signal of a transmission coil system used in the MRI system.

摘要翻译： 组合器/分离器装置（100）包括缠绕形成螺旋线圈（55）的两条传输线（23,24），该螺旋线圈被弯曲成环形形状。 此外，设置与两条传输线（23,24）的两个外部导体（25,26）并联连接的电容器（51）。 卷绕传输线和所述电容器的组合形成并联谐振器（56）。 组合器/分路器装置适用于磁共振成像（MRI）系统以组合接收器线圈系统的输出信号和/或分离MRI系统中使用的传输线圈系统的输入信号。

公开(公告)号：US20070069728A1

公开(公告)日：2007-03-29

申请号：US10595739

申请日：2004-11-04

申请人： Marinus Johannes Van Helvoort ,  Robert Kleihorst ,  Diana Geraats

发明人： Marinus Johannes Van Helvoort ,  Robert Kleihorst ,  Diana Geraats

IPC分类号： G01V3/00

CPC分类号： G01R33/3415 ,  G01R33/34007

摘要： An MRI system (1) comprises a housing (10) defining an examination space (2) for receiving a body for examination, a patient table (3) being displaceable into and out of the examination space (2), a magnetic field generating system (4) for generating a magnetic field in the examination space (2), and an electromagnetic resonance receive system (5) which comprises a set of dedicated receive coils (20). According to the invention at least one dedicated receive coil (20) is fixedly attached to the housing (10).

摘要翻译： MRI系统（1）包括限定用于接收用于检查的身体的检查空间（2）的壳体（10），可移动进出检查空间（2）的患者台（3），磁场产生系统 （4），用于在所述检查空间（2）中产生磁场;以及电磁共振接收系统（5），其包括一组专用接收线圈（20）。 根据本发明，至少一个专用接收线圈（20）固定地附接到壳体（10）。

公开(公告)号：US20070170918A1

公开(公告)日：2007-07-26

申请号：US10595474

申请日：2004-10-22

申请人： Marinus Vrinten ,  Cornelis Ham ,  Robert Kleihorst ,  Gerardus Mulder ,  Paulus Cornelius Haans

发明人： Marinus Vrinten ,  Cornelis Ham ,  Robert Kleihorst ,  Gerardus Mulder ,  Paulus Cornelius Haans

IPC分类号： G01V3/00

CPC分类号： G01R33/28 ,  G01R33/3806 ,  G01R33/422

摘要： The invention relates to a treatment room (7) suitable for recording images of a human or animal body on the basis of a magnetic resonance (MR) imaging technique, the walls (7a), the ceiling (7b) and the floor (7c) of the treatment room forming an electromagnetic shield for a magnetic resonance (MR) imaging system (1) arranged in the treatment room, which MR imaging system comprises at least a target area (5) in which a human or animal body can be placed, a housing (2, 3, 4) comprising at least one main magnetic unit and at least one gradient magnetic unit for generating one or more magnetic fields in the target area (5), and at least one radio-frequency (RF) pulse unit (6) for generating an electromagnetic RF pulse in the target area (5). The invention further relates to a magnetic resonance imaging system comprising a target area in which a human or animal body can be placed, a housing comprising at least one main magnetic unit and at least one gradient magnetic unit for generating one or more magnetic fields in the target area, and at least one radio-frequency (RF) pulse unit for generating an electromagnetic RF pulse in the target area. In accordance with the invention, means (10, 11, 12, 13, 14, 15, 16, 17) are present which, in operation, counteract the electromagnetic effects (8) of the RF pulse in the treatment room (7) outside the target area (5).

摘要翻译： 本发明涉及一种适用于基于磁共振（MR）成像技术，壁（7a），天花板（7b）和地板（MR）成像技术记录人体或动物体的图像的治疗室（7） 形成用于设置在治疗室中的磁共振（MR）成像系统（1）的电磁屏蔽的处理室，其中该MR成像系统至少包括目标区域（5），人体或动物体可以在其中 放置，包括至少一个主磁单元和用于在目标区域（5）中产生一个或多个磁场）和至少一个射频（RF）的至少一个梯度磁单元的壳体（2,3,4） ）脉冲单元（6），用于在目标区域（5）中产生电磁RF脉冲。 本发明还涉及一种磁共振成像系统，其包括其中可以放置人或动物体的目标区域，包括至少一个主磁单元和至少一个梯度磁单元的壳体，用于在该区域中产生一个或多个磁场 目标区域和用于在目标区域中产生电磁RF脉冲的至少一个射频（RF）脉冲单元。 根据本发明，存在装置（10,11,12,13,14,15,16,17），其在操作中抵消外部处理室（7）中的RF脉冲的电磁效应（8） 目标区域（5）。

公开(公告)号：US20060273793A1

公开(公告)日：2006-12-07

申请号：US10557757

申请日：2004-05-17

申请人： Nicolaas Roozen ,  Robert Kleihorst ,  Cornelis Leonardus Ham ,  Martijn La Grange

发明人： Nicolaas Roozen ,  Robert Kleihorst ,  Cornelis Leonardus Ham ,  Martijn La Grange

IPC分类号： G01V3/00

CPC分类号： G01R33/3854

摘要： The invention provides a magnetic resonance imaging (MRI) device (21), comprising a diagnostic space (25), a main magnetic system (22) for generating a main magnetic field in said diagnostic space, a gradient magnetic coil system (23) comprising a gradient coil for generating at least one gradient of the main magnetic field, and noise reducing means (29, 32) for reducing noise that is generated as a result of vibrations of the gradient coil. The noise reducing means comprise a sound-absorbing panel (29) disposed between the gradient coil and the diagnostic space. The sound-absorbing panel (29) comprises channels having an open end and a closed end.

摘要翻译： 本发明提供一种磁共振成像（MRI）装置（21），包括诊断空间（25），用于在所述诊断空间中产生主磁场的主磁系统（22），梯度磁线圈系统（23），包括 用于产生主磁场的至少一个梯度的梯度线圈，以及用于降低由于梯度线圈的振动而产生的噪声的降噪装置（29,32）。 降噪装置包括设置在梯度线圈和诊断空间之间的吸音板（29）。 吸声板（29）包括具有开口端和封闭端的通道。

公开(公告)号：US20060261809A1

公开(公告)日：2006-11-23

申请号：US10569193

申请日：2004-08-09

申请人： Miha Fuderer ,  Robert Kleihorst

发明人： Miha Fuderer ,  Robert Kleihorst

IPC分类号： G01V3/00

CPC分类号： G01R33/246 ,  G01R33/3415 ,  G01R33/5611 ,  G01R33/5659

摘要： The invention relates to a method for determination of spatial sensitivity profiles of RF transmit and/or receive coils (7, 8, 9) in an examination volume (17) of a magnetic resonance (MR) imaging device (1). In accordance with the method of the invention, nuclear magnetization is excited within the examination volume (17) by a sequence of RF pulses and switched magnetic field gradients, wherein the sequence comprises RF pulses with at least two different excitation flip angles. MR signals are acquired and processed so as to form at least two MR images, each corresponding to one of these flip angles. The spatial sensitivity profiles are then computed in the positions of the pixels or voxels of the MR images based upon the dependence of the pixel or voxel values on the respective flip angles. Alternatively, a plurality of instances of a sequence of RF pulses and switched magnetic field gradients is applied and MR signals are acquired, wherein a different combination of transmit and receive coils (7, 8, 9) is used for each instance of the sequence. The spatial sensitivity profiles are then computed in the positions of the pixels or voxels of the MR images formed from the acquired MR signals by taking the logarithm of the pixel or voxel values and by solving a linear system of equations for each pixel or voxel.

摘要翻译： 本发明涉及一种用于确定在磁共振（MR）成像装置（1）的检查体积（17）中的RF发射和/或接收线圈（7,8,9）的空间灵敏度分布的方法。 根据本发明的方法，通过一系列RF脉冲和切换的磁场梯度，在检查体积（17）内激发核磁化，其中该序列包括具有至少两个不同激发翻转角的RF脉冲。 获取并处理MR信号以形成至少两个MR图像，每个MR图像对应于这些翻转角之一。 然后基于像素或体元值对相应翻转角的依赖性，在MR图像的像素或体素的位置中计算空间灵敏度分布。 或者，施加RF脉冲序列和切换磁场梯度的多个实例，并获取MR信号，其中发射和接收线圈（7,8,9）的不同组合用于序列的每个实例。 然后，通过采取像素或体元值的对数，并通过求解每个像素或体素的线性方程组，在由所获取的MR信号形成的MR图像的像素或体素的位置中计算空间灵敏度分布。