公开(公告)号：US07769425B2

公开(公告)日：2010-08-03

申请号：US11575527

申请日：2005-09-13

申请人： Paul Royston Harvey ,  Willem Marten Prins ,  Zhiyong Zhai ,  Miha Fuderer ,  Gerrit Hendrik Van Yperen

发明人： Paul Royston Harvey ,  Willem Marten Prins ,  Zhiyong Zhai ,  Miha Fuderer ,  Gerrit Hendrik Van Yperen

IPC分类号： A61B5/05

CPC分类号： G01R33/543 ,  G01R33/34046 ,  G01R33/5612 ,  G01R33/5659

摘要： A device performs MR imaging of a body (7) placed in a stationary and substantially homogeneous main magnetic field, with an RF transmit antenna (6) for radiating RF pulses towards the body (7), which RF transmit antenna (6) has different resonance modes. In order to improve image uniformity in high field MR imaging, the device (1) is arranged to determine the size and/or the aspect ratio of the body (7), and to acquire an MR image of the body (7) by an imaging sequence including RF pulses. The phases and amplitudes of the different resonance modes of the RF transmit antenna (6) excited during irradiation of the RF pulses are controlled on the basis of the size and/or aspect ratio of the body (7).

摘要翻译： 设备对放置在固定且基本均匀的主磁场中的主体（7）进行MR成像，其中RF射频天线（6）用于向身体（7）辐射RF脉冲，该RF发射天线（6）具有不同的 谐振模式。 为了提高高场MR成像中的图像均匀性，设备（1）被布置成确定身体（7）的尺寸和/或纵横比，并且通过一个 成像序列包括RF脉冲。 基于身体（7）的尺寸和/或纵横比来控制RF辐射照射期间激发的RF发射天线（6）的不同谐振模式的相位和振幅。

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。

公开(公告)号：US06882150B2

公开(公告)日：2005-04-19

申请号：US10498415

申请日：2002-11-27

申请人： Hans Gerard Jenniskens ,  Gerrit Hendrik Van Yperen ,  Johannes Petrus Groen

发明人： Hans Gerard Jenniskens ,  Gerrit Hendrik Van Yperen ,  Johannes Petrus Groen

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/561 ,  G01V3/00

CPC分类号： G01R33/5615

摘要： A magnetic resonance imaging method which involves a pulse sequence for generating magnetic resonance signals and in which diffusion weighting is applied, for example, by way of a pair of gradient pulses which are separated by a 180° refocusing RF pulse. The magnetic resonance signals are generated as spin echo signals due to refocusing pulses. The refocusing pulses are flanked by compensation gradient pulses and the gradient strengths of the compensation gradient pulses are alternated according to a periodic pattern.

摘要翻译： 一种磁共振成像方法，其包括用于产生磁共振信号的脉冲序列，并且其中例如通过由180°重聚焦RF脉冲分离的一对梯度脉冲施加扩散加权。 磁共振信号由于重聚焦脉冲而产生为自旋回波信号。 重聚焦脉冲侧面是补偿梯度脉冲，并且补偿梯度脉冲的梯度强度根据周期性图案交替。