磁共振Propeller技术消除患者因运动及磁敏感效应造成伪影的作用(英文)

Magnetic resonance Propeller technique in reducing motion or magnetic susceptibility caused artifacts

背景:运动伪影及磁敏感伪影严重影响MR成像质量,Propeller技术采用填充模式,以辐射状的叶片用螺旋的方式采集数据,在很大程度上解决了运动伪影及磁敏感伪影的问题。目的:探讨Propeller技术在头部伪影消除的应用价值。设计、时间及地点:对比观察实验,于2006-07/2007-04在解放军成都军区昆明总医院完成。参试者:21例磁共振头颅日常检查中出现躁动或不能自控患者,5例固定义齿致磁敏感伪影明显者。方法:对21例磁共振头颅日常检查躁动或不能自控患者,常规T2FRFSE序列运动伪影明显,用Propeller技术进行T2WI扫描并进行对比;5例常规扩散加权图像序列磁敏感伪影明显者进行Propeller 扩散加权图像扫描并进行对比。主要观察指标:Propeller技术应用后运动伪影与磁敏感伪影的改变情况。结果:21例应用Propeller技术进行T2WI扫描明显减少或消除了运动伪影,5例Propeller扩散加权图像明显消除磁敏感效应引起的伪影,均生成较满意图像。结论:应用Propeller T2WI及扩散加权图像成像技术可以明显减少或消除患者因运动及磁敏感效应造成的伪影,显著提高图像质量,获得具有临床诊断价值的理想图像。

BACKGROUND： Motion artifacts and magnetic susceptibility artifacts have serious impacts on magnetic resonance （MR） image quality. Periodically rotated overlapping parallel lines with enhanced reconstruction （Propeller） technique, collecting data spirally using radial blades by filling pattern, greatly reduce or eliminate these artifacts. OBJECTIVE： To discuss the clinical application of MR Propeller technique in eliminating the artifacts of brain images. DESIGN, TIME AND SETTING： The comparative observation was performed at Kunming General Hospital of Chengdu Military Area Command of Chinese PLA from July 2006 to April 2007. PARTICIPANTS： Twenty-one cases showed dysphoria or unable to control oneself in the routine cranial MRI examination, and 5 presented artifacts because of magnetic-susceptibility. METHODS： Twenty-one cases, who had dysphoria and could not control themselves in routine cranial MRI examination, underwent Propeller T2 weighted imaging （WI）, and the images were compared with routine T2 fast-recovery fast spin echo sequence; 5 cases, who had artifacts because of magnetic-susceptibility, received Propeller diffusion weighted imaging （DWI）, and the images were compared with routine DWI. MAIN OUTCOME MEASURES： The changes of motion artifacts and magnetic susceptibility artifacts resulted from Propeller technique. RESULTS： The artifacts caused by motion in 21 cases were significantly reduced or eliminated by Propeller T2WI scanning, and those caused by magnetic susceptibility in the other 5 cases were also significantly eliminated by Propeller DWI. Satisfactory MR images were obtained. CONCLUSION： Propeller T2WI or DWI technique can obviously reduce or eliminate the artifacts caused by motion or magnetic-susceptibility, and can significantly improve the image quality for clinical diagnosis.