公开(公告)号：US20090033327A1

公开(公告)日：2009-02-05

申请号：US11911723

申请日：2006-04-07

申请人： Bernd Aldefeld ,  Peter Boernert ,  Jochen Keupp

发明人： Bernd Aldefeld ,  Peter Boernert ,  Jochen Keupp

IPC分类号： G01R33/563

CPC分类号： G01R33/56375

摘要： A continuous moving table magnetic resonance imaging method is proposed where a ‘lateral’ read out is performed that is transverse to the direction of motion. This magnetic resonance imaging method for imaging a moving object includes spatially selective RF excitations are applied for respective phase-encodings. The sub-volume is excited by the spatially selective RF excitation moves with the motion of the object for respective subsets of primary phase-encodings. Acquisition of magnetic resonance signals is performed from a three-dimensional sub-volume of the object. The magnetic resonance signals are read encoded in a direction transverse to the direction of motion of the object and phase-encoded in at least the direction of motion of the object.

摘要翻译： 提出了一种连续移动台磁共振成像方法，其中执行横向于运动方向的“横向”读出。 用于对运动物体成像的这种磁共振成像方法包括空间选择性的RF激励用于各自的相位编码。 子体积被空间选择性RF激发移动与物体的运动激励，以相应的主相位编码子集。 从对象的三维子体积执行磁共振信号的获取。 磁共振信号在横向于物体的运动方向的方向上被读取，并且至少在物体的运动方向上进行相位编码。

公开(公告)号：US20090003674A1

公开(公告)日：2009-01-01

申请号：US11909167

申请日：2006-03-27

申请人： Jochen Keupp ,  Peter Boernert ,  Bernd Aldefeld

发明人： Jochen Keupp ,  Peter Boernert ,  Bernd Aldefeld

IPC分类号： G06K9/54

CPC分类号： G01R33/56375 ,  G01R33/5611

摘要： During continuous moving of an imaging subject (12) through a scanner field of view (20), k-space data are acquired using a plurality of radio frequency coils (24, 26). The acquiring includes undersampling of k-space in at least one undersampled direction. A weighted transform (62) from k-space to real space is defined for at least one undersampled direction. The weighted transform incorporates patient position-dependent coil sensitivity weighting factors and a Fourier transform. The acquired k-space data are hybrid transformed along the direction of continuous moving to define hybrid space data having a real space dimension in the transformed direction of continuous moving and a k-space dimension in a transverse direction that is transverse to the direction of continuous moving. The hybrid space data are transformed along the transverse direction to generate a reconstructed image. The hybrid transforming and the transforming employ the defined weighted transform (62) conditional upon the corresponding direction being undersampled.

摘要翻译： 在成像对象（12）通过扫描仪视野（20）的连续移动期间，使用多个射频线圈（24,26）获取k空间数据。 获取包括至少一个欠采样方向的k空间欠采样。 对于至少一个欠采样方向，定义从k空间到实际空间的加权变换（62）。 加权变换包括患者位置相关的线圈灵敏度加权因子和傅里叶变换。 所获取的k空间数据沿着连续移动的方向被混合变换以限定在连续移动的变换方向上具有实际空间尺寸的混合空间数据和横向于连续方向的横向方向上的k空间尺寸 移动。 混合空间数据沿着横向变换以产生重构图像。 混合变换和变换采用定义的加权变换（62），条件是相应方向被欠采样。

公开(公告)号：US09689945B2

公开(公告)日：2017-06-27

申请号：US13816305

申请日：2011-08-15

申请人： Kay Nehrke ,  Peter Boernert

发明人： Kay Nehrke ,  Peter Boernert

IPC分类号： G01V3/00 ,  G01R33/54 ,  G01R33/561 ,  G01R33/565

CPC分类号： G01R33/543 ,  G01R33/5612 ,  G01R33/5659

摘要： A virtual coil emulation method is used in a magnetic resonance imaging scan for acquiring a magnetic resonance image of an object (10). The scan is performed by an MR system (1) using a physical coil arrangement (9; 11; 12; 13) including a set of individual transmit coils. The coils are adapted for transmission of a desired RF transmit field to the object (10) for magnetic resonance spin excitation of the object (10). Each coil is associated with a physical transmit channel. The RF transmit field corresponds to a virtual arrangement of two or more of the coils. Virtual transmit channel properties include virtual transmit channel weights are assigned to the RF transmit field which describe the virtual complex RF field amplitudes with respect to each individual coil of the virtual coil arrangement to be applied to the physical coils (9; 11; 12; 13) for generating the RF transmit field.

公开(公告)号：US08698495B2

公开(公告)日：2014-04-15

申请号：US12933897

申请日：2009-03-26

申请人： Kay Nehrke ,  Peter Boernert ,  Tobias Ratko Voigt ,  Ulrich Katscher

发明人： Kay Nehrke ,  Peter Boernert ,  Tobias Ratko Voigt ,  Ulrich Katscher

IPC分类号： G01V3/00

CPC分类号： G01R33/586 ,  G01R33/246 ,  G01R33/3415 ,  G01R33/5612 ,  G01R33/56518 ,  G01R33/5659

摘要： A magnetic resonance method includes performing a plurality of magnetic resonance excitation operations each using a different sub-set of a set of radio frequency transmit coils (30), each sub-set including more than one radio frequency transmit coil, acquiring magnetic resonance data responsive to each said magnetic resonance excitation operation, and computing a B1 or flip angle map for each radio frequency transmit coil of the set of radio frequency transmit coils based on the acquired magnetic resonance data. A magnetic resonance method includes performing an actual flip angle mapping (AFI) sequence using a radio frequency transmit coil (32) with a ratio TR1:TR2 of the TR times of the AFI sequence selected to be rational, acquiring magnetic resonance data responsive to said AFI sequence, and computing a B1 or flip angle map for the radio frequency transmit coil based on the acquired magnetic resonance data.

摘要翻译： 磁共振方法包括使用一组射频发射线圈（30）的不同子集执行多个磁共振激励操作，每个子集包括多于一个射频发射线圈，响应于磁共振数据 到每个所述磁共振激励操作，以及基于所获取的磁共振数据计算所述射频发射线圈组中的每个射频发射线圈的B1或翻角图。 磁共振方法包括使用射频发射线圈（32）执行实际的翻转角映射（AFI）序列，其中AFI序列的TR次的比值TR1：TR2被选择为合理，获取响应于所述的 AFI序列，并且基于获取的磁共振数据计算用于射频发射线圈的B1或翻转角图。

公开(公告)号：US20090177076A1

公开(公告)日：2009-07-09

申请号：US12296936

申请日：2007-04-05

申请人： Bernd Aldefeld ,  Peter Boernert ,  Jochen Keupp ,  Johan Samuel Van Den Brink

发明人： Bernd Aldefeld ,  Peter Boernert ,  Jochen Keupp ,  Johan Samuel Van Den Brink

IPC分类号： A61B5/05

CPC分类号： G01R33/56375 ,  G01R33/56383 ,  G01R33/56509 ,  G01R33/5673 ,  G01R33/5676

摘要： A magnetic resonance examination system has an object carrier (14) to move an object to be examined relative to the field of view. A monitoring system (33) monitors examination circumstances under which magnetic resonance signals are acquired from the object within the field of view. In particular the monitoring system monitors the degree of physiological motion in the patient to be examined. A velocity control system (32) to control the velocity of the movement of the object relative to the field of view and to control the velocity on the basis of the monitored examination circumstances, i.e. the degree of physiological motion.

摘要翻译： 磁共振检查系统具有用于相对于视场移动待检查物体的物体载体（14）。 监视系统（33）监视从视野内的物体获取磁共振信号的检查情况。 特别地，监测系统监测待检查患者的生理运动程度。 一种速度控制系统（32），用于控制物体相对于视场的移动速度，并且基于所监视的检查情况即生理运动的程度来控制速度。

公开(公告)号：US20120256630A1

公开(公告)日：2012-10-11

申请号：US13516747

申请日：2010-12-28

申请人： Christoph Leussler ,  Daniel Wirtz ,  Peter Boernert ,  Jochen Keupp ,  Holger Eggers ,  Bernd David ,  Johannes Adrianus Overweg ,  Rainer Eckart

发明人： Christoph Leussler ,  Daniel Wirtz ,  Peter Boernert ,  Jochen Keupp ,  Holger Eggers ,  Bernd David ,  Johannes Adrianus Overweg ,  Rainer Eckart

IPC分类号： G01R33/28

CPC分类号： G01R33/62 ,  G01R33/282 ,  G01R33/5601 ,  G01R33/5605 ,  G01R33/5608 ,  G01R33/56366 ,  G01R33/56383

摘要： The invention relates to a dynamic nuclear polarization apparatus (116) for continuous provision of hyperpolarized samples (114) comprising dynamically nuclear polarized nuclear spins, the apparatus (116) comprising a polarization region (106) for polarization of said nuclear spins resulting in said hyperpolarized samples, wherein the apparatus (116) further comprises: a cryostat (102) for cooling the samples (114) in the polarization region (106), a magnet (100) for providing a magnetic field to the cooled samples in the polarization region (106), a radiation source (112) for concurrently to the magnetic field provision providing a nuclear polarizing radiation to the polarization region (106) for receiving the hyperpolarized samples, a sample transport system (104) for continuously receiving unpolarized samples (114), transporting the unpolarized samples to the polarization region (106) for nuclear spin polarization and providing the resulting hyperpolarized samples (114).

摘要翻译： 本发明涉及用于连续提供包括动态核偏振核自旋的超极化样本（114）的动态核极化装置（116），所述装置（116）包括用于所述核自旋的极化的偏振区域（106），导致所述超极化 样品，其中所述装置（116）还包括：用于冷却所述偏振区域（106）中的样品（114）的低温恒温器（102），用于向所述偏振区域中的所述冷却样品提供磁场的磁体（100） 106），用于与磁场提供同时提供用于接收超极化样本的偏振区域（106）的核偏振辐射的辐射源（112），用于连续接收非偏振样本（114）的样本传输系统（104） 将非偏振样品运送到用于核自旋极化的偏振区域（106），并提供所得到的超极化样本（114）。

公开(公告)号：US07436178B2

公开(公告)日：2008-10-14

申请号：US10595805

申请日：2004-11-03

申请人： Jochen Keupp ,  Bernd Aldefeld ,  Peter Boernert

发明人： Jochen Keupp ,  Bernd Aldefeld ,  Peter Boernert

IPC分类号： G01V3/00

CPC分类号： G01R33/56375 ,  G01R33/5611 ,  G01R33/563

摘要： A plurality of global receive coils (24a, 24b, 24c) are stationarily positioned around a fixed field of view (FOV) of a magnetic resonance diagnostic imaging device (10). Each global receive coil receives undersampled phase and frequency encoded data from the stationary field of view. A subject is imaged as it moves continuously through the fixed field of view such that data is collected over a virtual field of view (vFOV) of the subject which is longer than the field of view in a longitudinal direction of subject motion. Centrally encoded k-space data, acquired from each of the global receive coils, is used to generate coil sensitivity patterns (42) which are mapped (44) from the stationary field of view to the virtual field of view. A SENSE reconstruction processor (54) performs a SENSE reconstruction on the virtual field of view data in which reconstructed data is combined and unfolded in accordance with the virtual field of view sensitivity patterns (48) to generate a virtual field of view image representation (60).

摘要翻译： 多个全局接收线圈（24a，24b，24c）被固定地围绕磁共振诊断成像装置（10）的固定视野（FOV）定位。 每个全局接收线圈从静止视场接收欠采样的相位和频率编码数据。 当被摄体连续移动通过固定视野时，对象被成像，使得数据在被摄体的虚拟视野（vFOV）上被收集，所述虚拟视场（vFOV）在主体运动的纵向方向上比视场长。 从每个全局接收线圈获取的集中编码的k空间数据用于产生从静止视场映射到虚拟视场的线圈灵敏度模式（42）。 SENSE重建处理器（54）在虚拟视野数据上执行SENSE重建，其中根据虚拟视场灵敏度模式（48）组合和展开重构数据，以生成虚拟视野图像表示（60 ）。

公开(公告)号：US20070145977A1

公开(公告)日：2007-06-28

申请号：US10595805

申请日：2004-11-03

申请人： Jochen Keupp ,  Bernd Aldefeld ,  Peter Boernert

发明人： Jochen Keupp ,  Bernd Aldefeld ,  Peter Boernert

IPC分类号： G01V3/00

CPC分类号： G01R33/56375 ,  G01R33/5611 ,  G01R33/563

摘要： A plurality of global receive coils (24a, 24b, 24c) are stationarily positioned around a fixed field of view (FOV) of a magnetic resonance diagnostic imaging device (10). Each global receive coil receives undersampled phase and frequency encoded data from the stationary field of view. A subject is imaged as it moves continuously through the fixed field of view such that data is collected over a virtual field of view (vFOV) of the subject which is longer than the field of view in a longitudinal direction of subject motion. Centrally encoded k-space data, acquired from each of the global receive coils, is used to generate coil sensitivity patterns (42) which are mapped (44) from the stationary field of view to the virtual field of view. A SENSE reconstruction processor (54) performs a SENSE reconstruction on the virtual field of view data in which reconstructed data is combined and unfolded in accordance with the virtual field of view sensitivity patterns (48) to generate a virtual field of view image representation (60).

摘要翻译： 多个全局接收线圈（24a，24b，24c）被固定地围绕磁共振诊断成像装置（10）的固定视野（FOV）定位。 每个全局接收线圈从静止视场接收欠采样的相位和频率编码数据。 当被摄体连续移动通过固定视野时，对象被成像，使得数据在被摄体的虚拟视野（vFOV）上被收集，所述虚拟视场（vFOV）在主体运动的纵向方向上比视场长。 从每个全局接收线圈获取的集中编码的k空间数据用于产生从静止视场映射到虚拟视场的线圈灵敏度模式（42）。 SENSE重建处理器（54）在虚拟视野数据上执行SENSE重建，其中根据虚拟视场灵敏度模式（48）组合和展开重构数据，以生成虚拟视野图像表示（60 ）。

公开(公告)号：US08890524B2

公开(公告)日：2014-11-18

申请号：US13260580

申请日：2010-04-01

申请人： Peter Boernert ,  Ingmar Graesslin ,  Kay Nehrke

发明人： Peter Boernert ,  Ingmar Graesslin ,  Kay Nehrke

IPC分类号： G01R33/48 ,  G01R33/34 ,  G01R33/565 ,  G01R33/28 ,  G01R33/3415 ,  G01R33/561 ,  G01R33/54

CPC分类号： G01R33/3415 ,  G01R33/288 ,  G01R33/543 ,  G01R33/5612 ,  G01R33/5659

摘要： When generating an MR image using a multi-channel transmit coil arrangement, SAR is reduced by employing a number of different RF pulses in a single scan. Each RF pulse exhibits a different performance and/or accuracy, resulting in different RF pulse-specific SAR values. As a result, the RF pulses differ slightly in actual excitation pattern, B1 waveform and/or k-space trajectory, etc. The average SAR over a single scan is thus reduced compared to a fixed RF pulse, without compromising image quality.

摘要翻译： 当使用多通道发射线圈装置产生MR图像时，通过在单次扫描中采用多个不同的RF脉冲来减小SAR。 每个RF脉冲表现出不同的性能和/或精度，导致不同的RF脉冲特定SAR值。 结果，RF脉冲在实际激励模式，B1波形和/或k空间轨迹等方面略有差异。与固定的RF脉冲相比，单次扫描的平均SAR相比降低，而不影响图像质量。

公开(公告)号：US20120007600A1

公开(公告)日：2012-01-12

申请号：US13257317

申请日：2010-03-22

申请人： Peter Boernert ,  Kay Nehrke

发明人： Peter Boernert ,  Kay Nehrke

IPC分类号： G01R33/44 ,  G01R33/341

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/5659 ,  G01R33/583 ,  G01R33/586

摘要： A method comprises: performing a number of B i field mapping sequences (24) using a set of radio frequency transmit coils (11) to acquire a B1 field mapping data set wherein said number is less than a number of radio frequency transmit coils in the set of radio frequency transmit coils; and determining coil sensitivities (30) for the set of radio frequency transmit coils based on the acquired B1 field mapping data set. In some embodiments, the performed B1 field mapping sequences are defined by (i) performing a linear transform (40) on the set of radio frequency transmit coils to generate a set of orthogonal virtual radio frequency transmit coils (42) and (ii) selecting (44) a sub-set (46) of the set of orthogonal virtual radio frequency transmit coils that define the performed B1 field mapping sequences.

摘要翻译： 一种方法包括：使用一组射频发射线圈（11）来执行多个B i场映射序列（24），以获取B1场映射数据集，其中所述数小于所述射频发射线圈的数量 射频发射线圈组; 以及基于所获取的B1场映射数据集来确定所述一组射频发射线圈的线圈灵敏度（30）。 在一些实施例中，所执行的B1场映射序列由（i）在射频发射线圈组上执行线性变换（40）来定义，以产生一组正交虚拟射频发射线圈（42）和（ii）选择 （44）定义所执行的B1场映射序列的所述一组正交虚拟射频发射线圈的子集（46）。