| 自导航快速自旋回波在低场MRI上的实现 |
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| 引用本文： | 陈伟波,李建奇,姜小平,李鲠颖. 自导航快速自旋回波在低场MRI上的实现[J]. 波谱学杂志, 2009, 26(2): 197-205 |
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| 作者姓名： | 陈伟波 李建奇 姜小平 李鲠颖 |
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| 作者单位： | (上海市功能磁共振成像重点实验室, 华东师范大学 物理系, 上海 200062) |
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| 基金项目： | 上海市科学技术委员会资助项目，上海市功能磁共振成像重点实验室(华东师范大学)开放课题 |
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| 摘 要： | 低场磁共振成像仪一般需采用数据累加的办法来提高图像信噪比，这样会延长扫描时间，因此更易受运动伪影的影响. 为了解决运动伪影问题，本文在低场磁共振成像仪上实现了自导航快速自旋回波去运动伪影成像技术，并且与常规快速自旋回波序列进行了临床对比实验. 结果表明，与常规快速自旋回波序列相比，采用自导航快速自旋回波技术后，由于病人运动导致的伪影得到明显地抑制.
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| 关 键 词： | 运动伪影 磁共振成像(MRI) 自导航快速自旋回波 网格化重建 |
| 收稿时间： | 2008-12-04 |
| 修稿时间： | 2009-01-07 |
Implementation of Self-navigated Motion Correction Fast Spin Echo Technique at Low Field MRI System |
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| CHEN Wei-bo,LI Jian-qi,JIANG Xiao-ping,LI Geng-ying. Implementation of Self-navigated Motion Correction Fast Spin Echo Technique at Low Field MRI System[J]. Chinese Journal of Magnetic Resonance, 2009, 26(2): 197-205 |
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| Authors: | CHEN Wei-bo LI Jian-qi JIANG Xiao-ping LI Geng-ying |
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| Affiliation: | (Shanghai Key Laboratory of Functional Magnetic Resonance Imaging, Department of Physics, East China Normal University, Shanghai 200062, China) |
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| Abstract: | Motion artifacts at low field MRI system are more severe than those at high field strength MRI due to the longer scan time required to improve the signal-noise-ratio. As a result, image blurring and ghost artifacts caused by motion may degrade the quality of anatomical images and limit the detection of pathological changes. To reduce the motion artifacts, a self-navigated motion correction fast spin echo technique was implemented on our 0.35 T open permanent magnet MR imager. Clinical experiments showed that the motion artifacts were significantly decreased when this technique was applied. |
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| Keywords: | MRI motion artifacts self-navigation fast spin-echo sequence gridding reconstructio |
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