基于同时多层激发和并行成像的心脏磁共振电影成像

发布时间：2018-04-21 18:49

  本文选题：磁共振成像(MRI) + 心脏电影成像　； 参考：《波谱学杂志》2017年03期

【摘要】：磁共振成像(MRI)无创无害、对比度多、可以任意剖面成像的特点特别适合用于心脏成像,却因扫描时间长限制了其在临床上的应用.为了解决心脏磁共振电影成像屏气扫描时间过长的问题,该文提出了一种基于同时多层激发的多倍加速心脏磁共振电影成像及其影像重建的方法,该方法将相位调制多层激发(CAIPIRINHA)技术与并行加速(PPA)技术相结合,运用到分段采集心脏电影成像序列中,实现了在相位编码方向和选层方向的四倍加速,并使用改进的SENSE/GRAPPA算法对图像进行重建.分别在水模以及人体上进行了实验,将加速序列图像与不加速序列图像进行对比,结果验证了重建算法的有效性,表明该方法可以在保障图像质量以及准确测量心脏功能的前提下成倍节省扫描时间.
[Abstract]:Magnetic Resonance Imaging (MRI) is noninvasive and has many contrasts. It can be used in cardiac imaging because of its long scanning time, but its clinical application is limited. In order to solve the problem that the breath-holding time of cardiac magnetic resonance imaging is too long, this paper presents a method of multi-fold acceleration of cardiac magnetic resonance imaging and its reconstruction based on simultaneous multi-layer excitation. In this method, the phase modulation multi-layer excitation technique CAIPIRINHAA and the parallel acceleration PPA technique are combined, and the method is applied to the segmented acquisition of cardiac image sequences, which achieves four times acceleration in the direction of phase coding and layer selection. The improved SENSE/GRAPPA algorithm is used to reconstruct the image. Experiments were carried out on the water model and human body respectively. The results show that the reconstruction algorithm is effective, and the acceleration sequence image is compared with the non-acceleration sequence image. The results show that this method can save scanning time in the premise of guaranteeing image quality and measuring heart function accurately.
【作者单位】： 高端医学影像技术研究中心(中国科学院上海高等研究院);中国科学院大学;上海科技大学;上海联影医疗科技有限公司;
【基金】：中国科学院重点部署项目(Y325511211)
【分类号】：R445.2;TP391.41
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本文编号：1783688