公开(公告)号：US20110046475A1

公开(公告)日：2011-02-24

申请号：US12546269

申请日：2009-08-24

申请人： Benny Assif ,  Charles L. Dumoulin ,  Richard P. Mallozzi ,  Robert D. Darrow

发明人： Benny Assif ,  Charles L. Dumoulin ,  Richard P. Mallozzi ,  Robert D. Darrow

IPC分类号： A61B5/055

CPC分类号： G01R33/4804 ,  G01R33/24 ,  G01R33/243 ,  G01R33/4814 ,  G01R33/565 ,  G01R33/56509 ,  G01R33/56563 ,  G01R33/58

摘要： Techniques for correcting temperature measurement in MR thermometry are disclosed. In particular, phase shifts that arise from factors other than temperature changes are detected, facilitating correction of temperature measurements.

摘要翻译： 公开了用于校正MR测温中的温度测量的技术。 特别地，检测出由温度变化以外的因素引起的相移，便于校正温度测量。

公开(公告)号：US20110118587A1

公开(公告)日：2011-05-19

申请号：US12920690

申请日：2009-03-04

申请人： Peter B. Roemer ,  Richard P. Mallozzi ,  Yuan Cheng

发明人： Peter B. Roemer ,  Richard P. Mallozzi ,  Yuan Cheng

IPC分类号： A61B5/055

CPC分类号： G01R33/022 ,  A61B5/055

摘要： The invention provides various systems, machine readable programs and methods for performing imaging using a MR scanner. The MR scanner includes at least one local radio-frequency transmit coil and at least one local gradient coil. The local radio-frequency transmit coil(s) and local gradient coil(s) cooperate to define an imaging volume. The MR scanner further includes a control system for performing an imaging operation on a patient's anatomy disposed within the imaging volume. The control system permits a selective simultaneous increase of the gradient magnetic field strength and peak B1 field strength by substantially the same factor, f.

摘要翻译： 本发明提供了使用MR扫描器进行成像的各种系统，机器可读程序和方法。 MR扫描器包括至少一个局部射频发射线圈和至少一个局部梯度线圈。 局部射频发射线圈和局部梯度线圈协作来定义成像体积。 MR扫描器还包括用于对设置在成像体积内的患者解剖结构进行成像操作的控制系统。 控制系统允许梯度磁场强度和峰值B1场强的选择性同时增加基本相同的因子f。

公开(公告)号：US06498947B2

公开(公告)日：2002-12-24

申请号：US09791307

申请日：2001-02-23

申请人： Eddy B. Boskamp ,  Richard P. Mallozzi ,  William A. Edelstein

发明人： Eddy B. Boskamp ,  Richard P. Mallozzi ,  William A. Edelstein

IPC分类号： A61B505

CPC分类号： G01R33/422

摘要： A technique is disclosed for shielding rf magnetic fields in MRI systems. An rf shield is embedded in a gradient coil structure including X-, Y- and Z-axis coils. The rf shield is positioned between an inner gradient coil which is inherently decoupled from the rf field, and the remaining coils which require rf shielding. The inner gradient coil may be a Z-axis coil wound as a solenoid, the field of which is generally orthogonal with respect to the rf magnetic field. The rf shield is thereby placed at an enhanced distance from the rf coil, providing greater efficiency and permitting energy levels to be reduced to obtain the desired rf magnetic field strength.

摘要翻译： 公开了一种用于屏蔽MRI系统中的rf磁场的技术。 rf屏蔽嵌入包括X，Y和Z轴线圈的梯度线圈结构中。 rf屏蔽位于固有地与rf场分离的内部梯度线圈和需要rf屏蔽的剩余线圈之间。 内部梯度线圈可以是卷绕成螺线管的Z轴线圈，其磁场大致与rf磁场正交。 因此，rf屏蔽件被放置在距离rf线圈增强的距离处，提供更高的效率并且允许减小能量水平以获得期望的rf磁场强度。