摘要
目的:综述近年来对磁共振成像加速方法的研究进展。方法:磁共振成像是目前临床医学影像中最重要的非侵入式检查方法之一,然而其成像速度较低。因此,近来学者们提出各种MRI的加速方法。本文首先介绍了常用的加速方法,包括增加梯度场强、单位TR内采集多个PE、定位激发区、与变换域方法。另外,我们介绍了部分傅立叶复原方法、钥孔技术,尤其集中讨论了并行成像方法,例如理想PI、局部敏感度并行成像、敏感度编码、空间谐波同步采集、全局自校准部分并行采集、Space Rip方法等。结果:文章探讨了每种并行算法的采样机理与复原方法,总结了各种方法的优缺点,最后对将来的研究方向提出展望。结论:磁共振成像加速技术具有进一步研究的价值。
Abstract：Objective： The paper focuses on the survey of acceleration methods in Magnetic Resonance Imaging. Methods： Magnetic resonance imaging is one of the most crucial non-invasive diagnositicimplements in routine clinical examination. However, it is often limited by long scan time. Therefore, several acceleration methods are proposed in the last decade. In this study we first introduce common acceleration methods, such as increasing gradient fields, measuring multiple phase-encoding lines within a single TR period, locating the region of interest, and transforming domain methods. Next, we introduced in the partial Fourier reconstruction and keyhole technique. Afterwards, we fixate on the parallel imaging techniques, such as ideal PI, PILS, SENSE, SMASH, GRAPPA, SPACE RIP, etc. Results： We discussed the sampling mechanism and reconstruction methods for each method. Finally we conclude the paper by proposing incipient research trends. Conclusions： MRI acceleration technique is consequential in further research.
出处
《中国医学物理学杂志》
CSCD
2014年第4期5015-5021,共7页
Chinese Journal of Medical Physics
基金
国家自然科学基金(No.610011024)
南京师范大学高层次人才科研启动基金项目(No.2013119XGQ0061)
