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公开(公告)号：US09547060B2
公开(公告)日：2017-01-17
申请号：US14002549
申请日：2012-02-28
IPC分类号： G01R33/56 , G01R33/54 , G01R33/36 , G01R33/561 , G01R33/565 , G01R33/32 , G01R33/34
CPC分类号： G01R33/54 , G01R33/32 , G01R33/34076 , G01R33/3614 , G01R33/5605 , G01R33/5612 , G01R33/5659
摘要： The invention relates to a method of MR imaging of at least a portion of a body (110) of a patient placed in an examination volume of a MR device, the method comprising the steps of:—subjecting the portion of the body (110) to an imaging sequence comprising at least one RF pulse, the RF pulse being transmitted toward the portion of the body (110) via a RF coil arrangement (109) to which RF signals are supplied by two or more RF power amplifiers the RF power amplifiers being activated alternately during the imaging sequence in a time-multiplexed fashion, wherein the imaging sequence requires a RF duty cycle and/or a RF pulse duration exceeding the specification of at least one of the RF power amplifiers;—acquiring MR signals from the portion of the body (110); and—reconstructing a MR image from the acquired MR signals. Moreover, the invention relates to a method of MR spectroscopy involving the alternating use of RF power amplifiers in a time-multiplexed fashion.
摘要翻译： 本发明涉及放置在MR装置的检查体积中的患者的身体（110）的至少一部分的MR成像方法，该方法包括以下步骤： - 将身体部分（110） 涉及包括至少一个RF脉冲的成像序列，所述RF脉冲经由RF线圈装置（109）朝向身体（110）的部分传输，RF信号由两个或更多个RF功率放大器提供给RF功率放大器 在成像序列期间以时间复用的方式交替激活，其中所述成像序列需要超过RF功率放大器中的至少一个的规定的RF占空比和/或RF脉冲持续时间; - 从所述部分获取MR信号 的身体（110）; 并从所获取的MR信号重构MR图像。 此外，本发明涉及涉及以时分复用方式交替使用RF功率放大器的MR光谱的方法。
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公开(公告)号：US20130342207A1
公开(公告)日：2013-12-26
申请号：US14002549
申请日：2012-02-28
CPC分类号： G01R33/54 , G01R33/32 , G01R33/34076 , G01R33/3614 , G01R33/5605 , G01R33/5612 , G01R33/5659
摘要： The invention relates to a method of MR imaging of at least a portion of a body (110) of a patient placed in an examination volume of a MR device, the method comprising the steps of:—subjecting the portion of the body (110) to an imaging sequence comprising at least one RF pulse, the RF pulse being transmitted toward the portion of the body (110) via a RF coil arrangement (109) to which RF signals are supplied by two or more RF power amplifiers the RF power amplifiers being activated alternately during the imaging sequence in a time-multiplexed fashion, wherein the imaging sequence requires a RF duty cycle and/or a RF pulse duration exceeding the specification of at least one of the RF power amplifiers;—acquiring MR signals from the portion of the body (110); and—reconstructing a MR image from the acquired MR signals. Moreover, the invention relates to a method of MR spectroscopy involving the alternating use of RF power amplifiers in a time-multiplexed fashion.
摘要翻译： 本发明涉及放置在MR装置的检查体积中的患者的身体（110）的至少一部分的MR成像方法，该方法包括以下步骤： - 将身体部分（110） 涉及包括至少一个RF脉冲的成像序列，所述RF脉冲经由RF线圈装置（109）朝向身体（110）的部分传输，RF信号由两个或更多个RF功率放大器提供给RF功率放大器 在成像序列期间以时间复用的方式交替激活，其中所述成像序列需要超过RF功率放大器中的至少一个的规定的RF占空比和/或RF脉冲持续时间; - 从所述部分获取MR信号 的身体（110）; 并从所获取的MR信号重构MR图像。 此外，本发明涉及涉及以时分复用方式交替使用RF功率放大器的MR光谱的方法。
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公开(公告)号：US06653834B2
公开(公告)日：2003-11-25
申请号：US10014861
申请日：2001-11-13
申请人： Gabriele Marianne Beck , Romhild Martijn Hoogeveen , Paul Royston Harvey , Johan Samuel Van Den Brink
发明人： Gabriele Marianne Beck , Romhild Martijn Hoogeveen , Paul Royston Harvey , Johan Samuel Van Den Brink
IPC分类号： G01V300
CPC分类号： G01R33/4833 , G01R33/281 , G01R33/5619
摘要： A magnetic resonance imaging method is provided in which the magnetic resonance signals are acquired by sampling a selected region in the k-space. The selected region in the k-space is chosen in dependence on the object or structure to be imaged. In particular an anisotropic central sector in the k-space is chosen, its axis being dependent on the spatial orientation of the object or structure to be imaged. The magnetic resonance imaging method in accordance with the invention is particularly suitable for imaging arteries separately from veins in magnetic resonance angiography.
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公开(公告)号：US07417429B2
公开(公告)日：2008-08-26
申请号：US10547196
申请日：2004-02-18
IPC分类号： G01V3/00
CPC分类号： G01R33/56375 , G01R33/5611
摘要： A novel magnetic resonance imaging method is described, for forming an image of an object from a plurality of signals sampled in a restricted homogeneity region of a main magnet field of a magnetic resonance imaging apparatus. A patient disposed on a table is moved continuously through the bore of the main magnet and spins in a predetermined area of the patient are excited by an excitation pulse from a transmitter antenna, such that an image is formed over a region exceeding largely the restricted region. Data is undersampled in the restricted region by means off at least one receiver antenna in a plurality of receive situations being defined as a block of measurements contiguous in time having preserved magnetisation and presaturation conditions within the excited area of the patient. Fold-over artefacts due to said undersampling are unfolded by means of the known sensitivity pattern of the receiver antenna and/or the properties of selected factors determining said receive situations.
摘要翻译： 描述了一种新颖的磁共振成像方法，用于从在磁共振成像装置的主磁场的受限同质区域中采样的多个信号形成物体的图像。 设置在桌子上的患者连续移动通过主磁体的孔并且在患者的预定区域中的旋转被来自发射器天线的激励脉冲激发，使得在超过大部分限制区域的区域上形成图像 。 通过在多个接收情况中的至少一个接收机天线被限定为在时间上相邻的测量块，其在患者的激动区域内保持了磁化和预饱和状态，因此在受限区域中数据被欠采样。 由于所述欠采样引起的折叠伪影通过接收机天线的已知灵敏度图案和/或确定所述接收情况的选定因素的特性而展开。
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公开(公告)号：US07420369B2
公开(公告)日：2008-09-02
申请号：US11568331
申请日：2005-04-26
IPC分类号： G01V3/00
CPC分类号： G01R33/5601
摘要： In order to provide a magnetic resonance imaging system and method which allows an optimal timing of the imaging sequence at minimal procedure cost, a magnetic resonance imaging system and method is proposed, wherein a first MR scan of a structure of interest is performed for detecting the arrival of a contrast bolus in the structure of interest, the first MR scan using a first resonance frequency corresponding to first MR sensitive nuclei, the first performing step is repeated at least until the bolus arrival in the structure of interest has been detected, and a second MR scan of the structure of interest is performed for acquiring a MR image, the second MR scan using a second resonance frequency corresponding to second MR sensitive nuclei, the second nuclei being different from the first nuclei.
摘要翻译： 为了提供以最小程序成本实现成像序列的最佳定时的磁共振成像系统和方法，提出了一种磁共振成像系统和方法，其中执行感兴趣结构的第一MR扫描以检测 将造影剂团块到达感兴趣的结构中，使用对应于第一MR敏感核的第一共振频率的第一MR扫描，重复第一执行步骤，至少已经检测到到达感兴趣的结构中的推注， 执行感兴趣结构的第二MR扫描以获取MR图像，第二MR扫描使用对应于第二MR敏感核的第二共振频率，第二核与第一核不同。
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公开(公告)号：US07057388B2
公开(公告)日：2006-06-06
申请号：US10535587
申请日：2003-10-27
IPC分类号： G01V3/00
CPC分类号： G01R33/56341 , G01R33/56509
摘要： The invention relates to a method for magnetic resonance imaging (MRI) of at least a portion of a body placed in a stationary and substantially homogeneous main magnetic field. The method comprises the steps of subjecting the body to a diffusion-weighting sequence (DW1), generating a train of MR echoes (E1, E2, E3, E4, E5) by an imaging sequence (EPI1), and measuring this train of MR echoes. These steps are repeated until a complete imaging data set with a sufficient number of phase-encoding steps is measured. Thereafter, the imaging data set is corrected for macroscopic motions by means of an individual phase-correction of each train of MR echoes. Finally, an image is reconstructed from the imaging data. In order to provide a method for diffusion-weighted imaging, which requires a minimum additional measurement time for determining the phase errors of the imaging signals and which also guarantees a robust compensation of image artifacts caused by macroscopic motions of the body of the examined patient, the invention suggests to select the phase-encoding scheme of the imaging sequence such that each train of MR echoes (E1, E2, E3, E4, E5) comprises at least one initial MR navigator echo (E1), which forms and integral part of the imaging data set, wherein the phase-correction is derived from the MR navigator echo.
摘要翻译： 本发明涉及一种放置在静止和基本上均匀的主磁场中的身体的至少一部分的磁共振成像（MRI）的方法。 该方法包括以下步骤：通过成像序列（EPI 1）对身体进行扩散加权序列（DW 1），产生MR回波序列（E 1，E 2，E 3，E 4，E 5） ，并测量这一列MR回波。 重复这些步骤，直到测量具有足够数量的相位编码步骤的完整成像数据集。 此后，通过对每个MR回波序列进行单独的相位校正，对宏观运动校正成像数据组。 最后，从成像数据重建图像。 为了提供扩散加权成像的方法，其需要用于确定成像信号的相位误差的最小额外测量时间，并且还保证对被检查患者的身体的宏观运动引起的图像伪像的鲁棒补偿， 本发明建议选择成像序列的相位编码方案，使得MR回波序列（E 1，E 2，E 3，E 4，E 5）包括至少一个初始MR导航回波（E 1）， 其形成和成像数据集的组成部分，其中从MR导航回波导出相位校正。
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公开(公告)号：US06577127B2
公开(公告)日：2003-06-10
申请号：US09817097
申请日：2001-03-26
申请人： Paul Royston Harvey , Johan Samuel Van Den Brink , Romhild Martijn Hoogeveen , Gabriele Marianne Beck , Gerrit Hendrik Van Yperen
发明人： Paul Royston Harvey , Johan Samuel Van Den Brink , Romhild Martijn Hoogeveen , Gabriele Marianne Beck , Gerrit Hendrik Van Yperen
IPC分类号： G01V300
CPC分类号： G01R33/561 , G01R33/281 , G01R33/4824 , G01R33/5619 , G01R33/563 , G01R33/56308
摘要： A magnetic resonance imaging method is proposed wherein the MR signal acquisition is performed by separate scanning of central (40) and peripheral (70) sectors. Central and peripheral sectors are selected in an individual plane in the k-space and optionally an intermediate sector (50) between the peripheral and central sectors is also selected. The center (O) in the k-space in the individual plane at issue is situated within the central sector. The scanning of the k-space commences outside the center of the k-space and before or during increasing contrast. Preferably, the scanning is timed such that the center of the k-space is reached at maximum contrast (MR angiography) or at the value zero of the longitudinal magnetization (MR inversion recovery). The central sector is advantageously scanned in a stochastic order. The peripheral sector may be scanned along a spiral-shaped trajectory, radial trajectories or along high-low ordered lines.
摘要翻译： 提出了一种磁共振成像方法，其中通过中央（40）和外围（70）扇区的单独扫描来执行MR信号采集。 在k空间中的单个平面中选择中央和外围扇区，并且还可以选择外围和中央扇区之间的中间扇区（50）。 所涉及的个别飞机上的k空间中心（O）位于中央部门。 k空间的扫描在增加对比度之前或期间在k空间的中心外部开始。 优选地，扫描被定时使得以最大对比度（MR血管造影）达到k空间的中心或者在纵向磁化（MR反转恢复）的值为零。 中央扇区有利地以随机顺序扫描。 外围扇区可以沿着螺旋形轨迹，径向轨迹或沿着高低有序线扫描。
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公开(公告)号：US20090177076A1
公开(公告)日：2009-07-09
申请号：US12296936
申请日：2007-04-05
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。
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公开(公告)号：US20080262340A1
公开(公告)日：2008-10-23
申请号：US11569069
申请日：2005-05-12
IPC分类号： A61B5/055 , G01R33/563
CPC分类号： G01R33/56375
摘要： The invention relates to a MRI system and to a method for producing an image with such an system. In order to provide a MR imaging technique with a high efficient MR signal acquisition, which provides a high level of comfort to a patient, a MRI system and method are suggested, where image data from an object are acquired while the object is moving with variable speed relative to the MRI system, and where the image data are combined and an image of the object is reconstructed.
摘要翻译： 本发明涉及一种MRI系统和一种用这种系统生产图像的方法。 为了提供具有高效MR信号采集的MR成像技术，其为患者提供高水平的舒适性，建议了MRI系统和方法，其中在物体运动时获取来自对象的图像数据， 相对于MRI系统的速度，并且其中图像数据被组合并且重建对象的图像。
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公开(公告)号：US07215190B2
公开(公告)日：2007-05-08
申请号：US10496388
申请日：2002-11-20
申请人： Romhild Martijn Hoogeveen , Frederik Visser , Lolkje Frederika Zoer , Willem Marten Prins , Johan Samuel Van Den Brink
发明人： Romhild Martijn Hoogeveen , Frederik Visser , Lolkje Frederika Zoer , Willem Marten Prins , Johan Samuel Van Den Brink
IPC分类号： G01V3/00
CPC分类号： G01R33/4833 , G01R33/3415 , G01R33/5611
摘要： In a magnetic resonance imaging method magnetic resonance signal samples are received for a predetermined field of view by a receiving antenna having a spatial sensitivity profile. The sampling in the k space corresponds to the predetermined field of view in the geometrical space. Folded-over images having folded-over pixel values are reconstructed from the sampled magnetic resonance signals. Pixel contributions for spatial positions within the predetermined field of view are calculated from the folded-over pixel values and the spatial sensitivity profile of the receiver antenna. The magnetic resonance image is formed from the pixel contributions for spatial positions within the predetermined field of view. Thus, aliasing or fold-over artefacts caused by a field of view that is too small are avoided.
摘要翻译： 在磁共振成像方法中，通过具有空间灵敏度分布的接收天线，对于预定的视场来接收磁共振信号样本。 k空间中的采样对应于几何空间中的预定视场。 从采样的磁共振信号重建具有折叠像素值的折叠图像。 根据接收天线的折叠像素值和空间灵敏度曲线计算预定视场内的空间位置的像素贡献。 磁共振图像由预定视野内的空间位置的像素贡献形成。 因此，避免了由视场太小引起的混叠或折叠伪影。
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