专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明申请

US20120153950A1 RF SHIMMED MRI SLICE EXCITATION ALONG A CURVED SPOKE K-SPACE TRAJECTORY 审中-公开
标题翻译：射频SHIMMED MRI曲线激活在弯曲的空间K空间TRAJECTORY
公开(公告)号：US20120153950A1
公开(公告)日：2012-06-21
申请号：US13390618
申请日：2010-08-05
申请人： Ulrich Katscher
发明人： Ulrich Katscher
IPC分类号： G01R33/44
CPC分类号： G01R33/5612 , G01R33/4824 , G01R33/4833 , G01R33/4836 , G01R33/5659
摘要： A radio-frequency (RF) shimming apparatus (50) for use in a magnetic resonance imaging (MRI) system (10) comprises of a spatial sensitivity unit (30) which determines a transmit spatial sensitivity distribution of at least one RF coil (18,18′). A selection unit (32) selects an excitation pattern with a through-plane, one-dimensional excitation k-space trajectory. The through-plane, one-dimensional excitation k-space trajectory is curved into at least a second dimension by an optimization unit (34) according to the generated spatial sensitivity distribution. The optimization unit (34) supplies the curved excitation k-space trajectory to at least one transmitter (24) which causes the at least one RF transmit coil (18,18′) to transmit the selected excitation pattern with the curved excitation k-space trajectory.
摘要翻译：用于磁共振成像（MRI）系统（10）的射频（RF）匀场装置（50）包括空间灵敏度单元（30），其确定至少一个RF线圈（18）的发射空间灵敏度分布，18'）。选择单元（32）选择具有贯穿平面，一维激励k空间轨迹的激励图案。根据生成的空间灵敏度分布，通过平面的一维激发k空间轨迹由优化单元（34）弯曲成至少第二维度。优化单元（34）将弯曲激励k空间轨迹提供给至少一个发射器（24），所述发射器（24）使得至少一个RF发射线圈（18,18'）将所选择的激励模式与弯曲激励k空间弹道。

22. 发明授权

US08049497B2 MRI RF encoding using multiple transmit coils 失效
标题翻译：使用多个发射线圈的MRI RF编码
公开(公告)号：US08049497B2
公开(公告)日：2011-11-01
申请号：US12446661
申请日：2007-10-31
申请人： Ulrich Katscher , Peter Vernickel , Peter Boernert
发明人： Ulrich Katscher , Peter Vernickel , Peter Boernert
IPC分类号： G01V3/00
CPC分类号： G01R33/4831 , G01R33/3415
摘要： A common method of RF encoding assumes that the B1 field generated by the RF coils is linear, which is likely not the case in many situations. It is therefore desirable to have a method of operating an MR system to reconstruct an image of a subject, wherein the method is capable of also handling arbitrary B1 fields used for RF encoding. Accordingly, such an MR system employing one or more RF coils is disclosed herein. The method comprises obtaining transmit sensitivities and weighting factors for individual RF coils. Each RF coil is activated based on its respective weighting factor to apply RF excitation to a subject under examination in the MR system. MR signals—such as free induction decays (FID) signals or echo signals—generated from the subject in response to the RF excitation are received and processed based on the transmit sensitivities to generate an MR image or spectrum representative of the subject.
摘要翻译： RF编码的常见方法假定由RF线圈产生的B1场是线性的，这在许多情况下可能不是这种情况。因此，期望具有操作MR系统以重建对象的图像的方法，其中该方法还能够处理用于RF编码的任意B1字段。因此，这里公开了采用一个或多个RF线圈的这种MR系统。该方法包括获得单个RF线圈的发射灵敏度和加权因子。每个RF线圈基于其相应的加权因子被激活，以将RF激励施加到在MR系统中被检查的受试者。基于发射灵敏度接收和处理MR信号，例如响应于RF激励从受试者产生的自由感应衰减（FID）信号或回波信号，以产生代表对象的MR图像或频谱。

23. 发明授权

US07375524B2 Mr imaging with sensitivity encoding in the readout direction 失效
标题翻译：在读出方向进行灵敏度编码的成像
公开(公告)号：US07375524B2
公开(公告)日：2008-05-20
申请号：US10560872
申请日：2004-06-01
申请人： Ulrich Katscher , Mark J. Loncar , Michael R. Thompson
发明人： Ulrich Katscher , Mark J. Loncar , Michael R. Thompson
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： A magnetic resonance imaging system acquires a final image of a selected field of view with a selected spatial resolution. A magnetic resonance imaging scanner (10) encodes and receives magnetic resonance samples in phase encode and readout directions using a plurality of receive coils (14). The encoding and receiving undersamples in the readout direction. A reconstruction processor (30) reconstructs magnetic resonance samples acquired by each of the plurality of receive coils (14) into a corresponding plurality of intermediate reconstructed images. Each intermediate reconstructed image has aliasing and in some aspects degraded high spatial frequency characteristics due to the reduced sampling in the readout direction. A combining processor (40) combines the plurality of intermediate reconstructed images based on coil sensitivity factors (42) to produce the final reconstructed image with the selected field of view and the selected spatial resolution in the readout direction.
摘要翻译：磁共振成像系统以所选择的空间分辨率获取所选视场的最终图像。磁共振成像扫描器（10）使用多个接收线圈（14）对相位编码和读出方向的磁共振样本进行编码和接收。在读出方向编码和接收欠采样。重建处理器（30）将由多个接收线圈（14）中的每一个获取的磁共振样本重建成相应的多个中间重建图像。每个中间重建图像具有混叠，并且在一些方面由于在读出方向上的采样减少而导致高空间频率特性降低。组合处理器（40）基于线圈灵敏度因子（42）组合多个中间重建图像，以产生具有所选视场的最终重建图像，并且在读出方向上产生所选择的空间分辨率。

24. 发明授权

US08390288B2 Method and RF transmitter arrangement for generating RF fields 有权
标题翻译：用于产生RF场的方法和RF发射器装置
公开(公告)号：US08390288B2
公开(公告)日：2013-03-05
申请号：US12598451
申请日：2008-04-24
申请人： Ingmar Graesslin , Peter Boernert , Peter Vernickel , Ulrich Katscher
发明人： Ingmar Graesslin , Peter Boernert , Peter Vernickel , Ulrich Katscher
IPC分类号： G01V3/00
CPC分类号： G01R33/34046 , G01R33/288 , G01R33/3415 , G01R33/543 , G01R33/5604 , G01R33/5611 , G01R33/5659
摘要： A multi-channel RF transmitter arrangement comprising a plurality of RF transmitter elements like RE antennas, antenna elements, coils or coil elements, for generating an RF field, especially for use in a magnetic resonance imaging system for exciting nuclear magnetic resonances, and a method for generating such an RF field wherein the RF transmitter elements are segmented in a plurality of segments at least along the direction of one or more of the main magnetic field of the MRI system, the z-direction or the longitudinal direction.
摘要翻译：包括多个RF发射器元件的多通道RF发射器装置，如RE天线，天线元件，线圈或线圈元件，用于产生RF场，特别是用于激励核磁共振的磁共振成像系统，以及方法用于产生这样的RF场，其中RF发射器元件至少沿着MRI系统的主磁场，z方向或纵向方向中的一个或多个的方向被分段成多个段。

25. 发明申请

US20110156704A1 B1-MAPPING AND B1L-SHIMMING FOR MRI 有权
标题翻译：用于MRI的B1映射和B1L-SHIMMING
公开(公告)号：US20110156704A1
公开(公告)日：2011-06-30
申请号：US13063472
申请日：2009-09-10
申请人： Peter Boernert , Peter Koken , Kay Nehrke , Ulrich Katscher , Ingmar Graesslin
发明人： Peter Boernert , Peter Koken , Kay Nehrke , Ulrich Katscher , Ingmar Graesslin
IPC分类号： G01R33/34
CPC分类号： G01R33/583 , G01R33/246 , G01R33/3415 , G01R33/4838 , G01R33/5612 , G01R33/5659 , G01R33/586
摘要： The invention relates to a method of acquiring MRI image data comprising the following steps: performing a 3-dimensional B1 mapping of a first volume using a first voxel size, selecting an MRI protocol, performing the B1-shim in accordance with the MRI protocol, performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first voxel size is larger than the second voxel size, wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume.
摘要翻译：本发明涉及一种获取MRI图像数据的方法，包括以下步骤：使用第一体素大小执行第一体积的3维B1映射，选择MRI协议，根据MRI协议执行B1-垫片，执行MRI协议以使用第二体素尺寸获取第二体积的MRI成像数据，其中所述第一体素大小大于所述第二体素大小，其中所述第一体积大于所述第二体积，并且其中所述第二体积被包含在第一卷内。

26. 发明授权

US07839147B2 Shimming of electric field for electric properties tomography 有权
标题翻译：电子层析成像的电场匀场
公开(公告)号：US07839147B2
公开(公告)日：2010-11-23
申请号：US12297662
申请日：2007-11-08
申请人： Ulrich Katscher , Peter Vernickel , Marius Hanft
发明人： Ulrich Katscher , Peter Vernickel , Marius Hanft
IPC分类号： G01V3/00
CPC分类号： G01R33/48 , A61B5/0536 , G01R33/4808
摘要： A radio frequency coil system (34) used in the context of electric properties tomography (EPT, electrical impedance tomography, EIT, applied potential tomography, APT) generates radio frequency excitation pulses in an examination region (14). The radio frequency coil system (34) includes N coil elements (38) which generate magnetic (H) and electric (E) fields. A weight setting device (54) sets weight factors for input signals for the coil elements (38). A transmitting system (52) creates RF pulses, at least two sets of each with differently weighted input signals, and transmits the at least two sets of RF pulses to the coil elements (38) such that each of the transmitted RF pulse sets generates shifted electric fields (110, 112) having a shifted zero crossing point (120, 122) from each other. An image processor (62) computes electric permittivity maps from resonance induced by the at least two sets of RF pulses with different weighting.
摘要翻译：在电性能断层摄影（EPT，电阻断层扫描，EIT，应用电位层析成像，APT）的上下文中使用的射频线圈系统（34）在检查区域（14）中产生射频激励脉冲。射频线圈系统（34）包括产生磁（H）和电（E）场的N个线圈元件（38）。权重设定装置（54）为线圈元件（38）的输入信号设定权重因子。发射系统（52）产生RF脉冲，每个具有不同加权的输入信号的至少两组，并且将至少两组RF脉冲发送到线圈元件（38），使得每个发射的RF脉冲组产生偏移具有彼此偏移的零交叉点（120,122）的电场（110,112）。图像处理器（62）从具有不同加权的至少两组RF脉冲引起的共振计算电容率图。

27. 发明申请

US20090102480A1 SHIMMING OF ELECTRIC FIELD FOR ELECTRIC PROPERTIES TOMOGRAPHY 有权
标题翻译：电力电子学研究
公开(公告)号：US20090102480A1
公开(公告)日：2009-04-23
申请号：US12297662
申请日：2007-04-03
申请人： Ulrich Katscher , Peter Vernickel , Marius Hanft
发明人： Ulrich Katscher , Peter Vernickel , Marius Hanft
IPC分类号： G01R33/48
CPC分类号： G01R33/48 , A61B5/0536 , G01R33/4808
摘要： A radio frequency coil system (34) used in the context of electric properties tomography (EPT, electrical impedance tomography, EIT, applied potential tomography, APT) generates radio frequency excitation pulses in an examination region (14). The radio frequency coil system (34) includes N coil elements (38) which generate magnetic (H) and electric (E) fields. A weight setting device (54) sets weight factors for input signals for the coil elements (38). A transmitting system (52) creates RF pulses, at least two sets of each with differently weighted input signals, and transmits the at least two sets of RF pulses to the coil elements (38) such that each of the transmitted RF pulse sets generates shifted electric fields (110, 112) having a shifted zero crossing point (120, 122) from each other. An image processor (62) computes electric permittivity maps from resonance induced by the at least two sets of RF pulses with different weighting.
摘要翻译：在电性能断层摄影（EPT，电阻断层扫描，EIT，应用电位层析成像，APT）的上下文中使用的射频线圈系统（34）在检查区域（14）中产生射频激励脉冲。射频线圈系统（34）包括产生磁（H）和电（E）场的N个线圈元件（38）。权重设定装置（54）为线圈元件（38）的输入信号设定权重因子。发射系统（52）产生RF脉冲，每个具有不同加权的输入信号的至少两组，并且将至少两组RF脉冲发送到线圈元件（38），使得每个发射的RF脉冲组产生偏移具有彼此偏移的零交叉点（120,122）的电场（110,112）。图像处理器（62）从具有不同加权的至少两组RF脉冲引起的共振计算电容率图。

28. 发明授权

US07403005B2 Regularized variable density SENSE 失效
标题翻译：正则变量密度SENSE
公开(公告)号：US07403005B2
公开(公告)日：2008-07-22
申请号：US10597060
申请日：2005-01-05
申请人： Ulrich Katscher , Johan Van Den Brink , Miha Fuderer
发明人： Ulrich Katscher , Johan Van Den Brink , Miha Fuderer
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5608 , G01R33/5611
摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.
摘要翻译：磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。展开处理器（66）展开折叠的图像。正规化图像正规化展开。

29. 发明申请

US20070182412A1 Regularized variable density sense 失效
标题翻译：正则变量密度感
公开(公告)号：US20070182412A1
公开(公告)日：2007-08-09
申请号：US10597060
申请日：2005-01-05
申请人： Ulrich Katscher , Johan Van Den Brink , Miha Fuderer
发明人： Ulrich Katscher , Johan Van Den Brink , Miha Fuderer
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5608 , G01R33/5611
摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.
摘要翻译：磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。展开处理器（66）展开折叠的图像。正规化图像正规化展开。

30. 发明授权

US07176686B2 Parallel MR imaging method 失效
标题翻译：并行MR成像方法
公开(公告)号：US07176686B2
公开(公告)日：2007-02-13
申请号：US10498594
申请日：2002-12-19
申请人： Ulrich Katscher , Peter Boernert
发明人： Ulrich Katscher , Peter Boernert
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： The invention relates to a parallel MR imaging method in which first a first MR imaging sequence is formed with a selectable minimum number of phase encoding steps and at least two separate MR signal data sets are acquired by means of at least two MR receiving coils. A first MR image is reconstructed from this data while taking into account the spatial sensitivity profiles of the MR receiving coils. In order to improve parallel MR imaging methods of this kind, the invention proposes to evaluate the quality of the reconstructed MR image in a subsequent step of the method and, in dependence upon the result of the evaluation, to either terminate the imaging method or to form a further MR imaging sequence with a number of further phase encoding steps. This procedure can be continued until an adequate MR image quality is reached.
摘要翻译：本发明涉及一种并行MR成像方法，其中首先通过可选择的最小数量的相位编码步骤形成第一MR成像序列，并且借助于至少两个MR接收线圈获取至少两个单独的MR信号数据集。从该数据重建第一MR图像，同时考虑MR接收线圈的空间灵敏度分布。为了改进这种并行MR成像方法，本发明提出了在该方法的后续步骤中评价重建MR图像的质量，并且根据评估结果来终止成像方法或者终止成像方法形成具有多个进一步的相位编码步骤的另外的MR成像序列。可以继续该过程，直到达到足够的MR图像质量。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式