公开(公告)号：US07176687B2

公开(公告)日：2007-02-13

申请号：US10510853

申请日：2003-03-27

Applicant: Hans Gerard Jenniskens ,  Johan Samuel Van Den Brink

Inventor： Hans Gerard Jenniskens ,  Johan Samuel Van Den Brink

IPC: G01V3/00 ,  A61B5/55

CPC classification number: G01R33/5615 ,  G01R33/5613

Abstract: In a method for magnetic resonance imaging of at least a portion of a body placed in a stationary and substantially homogeneous main magnetic field, the body is subjected to a sequence of RF and magnetic field gradient pulses during an interval TSE, thereby generating a plurality of spin echo signals, which are measured and processed for reconstruction of an image. Thereafter, during an interval TDRV, an additional spin echo is generated by subjecting the body to at least one further refocusing RF pulse and/or magnetic field gradient pulse, and a RF drive pulse (βX) is irradiated at the time of this additional spin echo. In order to provide a fast and reliable method for T1-weighted imaging, which gives a high T1 contrast and also a sufficient signal-to-noise ratio, the phase of the RF drive pulse (βX) is selected such that nuclear magnetization at the time of the additional spin echo is transformed into negative longitudinal magnetization. The sequence is repeated beginning with another sequence of RF and magnetic field gradient pulses after a recovery period TREC.

Abstract translation: 在放置在静止且基本均匀的主磁场中的身体的至少一部分的磁共振成像的方法中，在间隔TSE期间对身体进行序列的RF和磁场梯度脉冲，由此产生多个 自旋回波信号，其被测量和处理用于重建图像。 此后，在间隔TDRV期间，通过对身体进行至少一个进一步的再聚焦RF脉冲和/或磁场梯度脉冲的产生，并且RF驱动脉冲（β×X）是 在该额外的自旋回波时照射。 为了提供一种提供高T 1对比度并且具有足够的信噪比的T 1 - 1加权成像的快速可靠的方法，该相位 选择RF驱动脉冲（βX X），使得额外自旋回波时的核磁化转变为负的纵向磁化强度。 在恢复期TREC之后，序列以另一个RF和磁场梯度脉冲序列重复开始。

公开(公告)号：US06882150B2

公开(公告)日：2005-04-19

申请号：US10498415

申请日：2002-11-27

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

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

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

CPC classification number: G01R33/5615

Abstract: 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.

Abstract translation: 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。