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1. 发明授权

US07012428B1 Method and apparatus of reducing artifacts in phase-cycled steady-state free precession imaging 失效
标题翻译：减少相位循环稳态自由进动成像中伪像的方法和装置
公开(公告)号：US07012428B1
公开(公告)日：2006-03-14
申请号：US10707483
申请日：2003-12-17
申请人： Heidi A. Ward , Bernice E. Hoppel
发明人： Heidi A. Ward , Bernice E. Hoppel
IPC分类号： G01V3/00
CPC分类号： G01R33/5613 , G01R33/56509
摘要： A method and apparatus of imaging multiple volumes of the anatomy of interest using a phase-cycled SSFP pulse sequence and a reverse elliptic centric view ordering to sample a first volume and an elliptic centric view ordering to sample a second volume is disclosed. Dummy acquisitions are played out between imaging of the first and second volumes, and the time to play out the dummy acquisitions is used to change the phase-cycling scheme of the RF pulses of the SSFP pulse sequence. Oscillations in signal are reduced as the spins in the anatomy of interest are brought to a new steady-state by gradually ramping the RF pulse phase increment for acquisition from the first volume to the RF pulse phase increment for acquisition from the second volume. The present invention is effective for reducing transient oscillations in MR signals from resonance and off-resonance spins, thus enabling the use of this technique for the reduction of motion artifacts in phase-cycled SSFP.
摘要翻译：公开了一种使用相循环的SSFP脉冲序列和反向椭圆中心视图来对感兴趣的解剖结构进行成像的多个体积的方法和装置，其顺序是对第一体积进行采样和以椭圆为中心的视图排序来采样第二体积。在第一和第二体积的成像之间进行虚拟采集，并且使用播放伪采集的时间来改变SSFP脉冲序列的RF脉冲的相位循环方案。当感兴趣的解剖结构中的旋转通过逐渐地将用于从第一体积获取的RF脉冲相位增量逐渐斜升到RF脉冲相位增量以从第二体积获取时，信号中的振荡被减小。本发明对于减少来自谐振和非共振自旋的MR信号的瞬态振荡是有效的，因此能够使用这种技术来减少相循环SSFP中的运动伪影。

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