公开(公告)号：US20070276221A1

公开(公告)日：2007-11-29

申请号：US10598665

申请日：2005-03-01

申请人： Jan Warntjes

发明人： Jan Warntjes

IPC分类号： G01R33/54

CPC分类号： G01R33/54 ,  G01R33/543 ,  G01R33/546 ,  G01R33/5611

摘要： The invention relates to a method and apparatus for generating magnetic resonance images. In order to achieve high quality magnetic resonance imaging combined with a user-friendly operating of a magnetic resonance apparatus it is proposed to use data obtained from a reference scan comprising SENCE reference data to determine an optimum scan parameter set taking into account a chosen target value of a specific scan parameter such as the scan time or the signal-to-noise ratio. Based on the reference scan, image noise is predicted for various sets of scan parameters (alternative use of SENCE or intrinsic foldover without SENCE; various orientations of the phase encoding direction within the slice plane). An optimum scan parameter set is determined (shortest scan time to match target SNR or hightest SNR to match target scan time).

摘要翻译： 本发明涉及一种用于产生磁共振图像的方法和装置。 为了实现高质量的磁共振成像与磁共振装置的用户友好的操作相结合，提出使用从包括SENCE参考数据的参考扫描获得的数据来确定考虑所选目标值的最佳扫描参数集 具体的扫描参数如扫描时间或信噪比。 基于参考扫描，针对各种扫描参数（SENCE的替代使用或不带SENCE的固有折射器）预测图像噪声;切片平面内的相位编码方向的各种取向。 确定最佳扫描参数集（最短扫描时间以匹配目标SNR或最高SNR以匹配目标扫描时间）。

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：US20070030003A1

公开(公告)日：2007-02-08

申请号：US10555937

申请日：2004-05-05

申请人： Jan Warntjes

发明人： Jan 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。

公开(公告)号：US20060058629A1

公开(公告)日：2006-03-16

申请号：US10536285

申请日：2003-11-20

申请人： Jan Warntjes ,  Johan Van Den Brink

发明人： Jan Warntjes ,  Johan Van Den Brink

IPC分类号： A61B5/05

CPC分类号： G01R33/5611

摘要： A novel magnetic resonance imaging method is presented for forming an image of an object from a plurality of signals acquired by an array of multiple receiver antennae. Prior to imaging a sensitivity map of each of the receiver antennae is provided, at least two adjacent antennae record signals originating from the same imaging position and the image intensity is calculated from the signals measured by different antennae, wherein the number of phase encoding steps is reduced with respect to the full set thereof. In addition the field of view is set smaller than the object size in phase encoding direction inducing intrinsic foldover artefacts, whereas the sensitivity map of the receiver antennae and a reference image featuring intrinsic foldover artefacts are used for reconstruction of the MR image to an unfolded image.

摘要翻译： 提出了一种新颖的磁共振成像方法，用于从由多个接收器天线的阵列获取的多个信号中形成对象的图像。 在成像之前，提供每个接收器天线的灵敏度图，根据由不同天线测量的信号计算源于相同成像位置和图像强度的至少两个相邻天线记录信号，其中相位编码步骤的数量为 相对于其全套减少。 此外，将视野设定为小于相位编码方向的物体大小，从而引起内在的折射伪像，而接收器天线的灵敏度图和具有固有的折射伪影的参考图像用于将MR图像重建为展开图像 。