时空编码单扫描磁共振成像的基本原理及重建方法  

Principles and reconstruction methods of spatiotemporally encoded single-shot MRI

作　　者：张婷[1] 蔡聪波[2] 蔡淑惠[1] 陈忠[1] 

机构地区：[1]厦门大学电子科学系,福建省等离子体与磁共振研究重点实验室,厦门361005 [2]厦门大学通信工程系,厦门361005

出　　处：《磁共振成像》2016年第7期555-560,共6页Chinese Journal of Magnetic Resonance Imaging

基　　金：国家自然科学基金(编号:11474236、11275161、81171331);福建省自然科学基金(编号:2014J01247)

摘　　要：单扫描磁共振成像技术凭借其良好的时间分辨率,近年来在扩散成像、实时动态三维成像、功能成像等生物医学领域得到广泛应用。在众多单扫描磁共振成像方法中,回波平面成像(EPI)是最常用的一种方法,但它存在一些局限性,特别是在高场条件下,其对磁场不均匀及化学位移效应十分敏感。基于时空编码的单扫描磁共振成像新方法,其对不均匀磁场及化学位移伪影有很好的鲁棒性,并延续了EPI良好的时间分辨率。作者主要阐述时空编码单扫描成像方法的基本原理、特性,时空编码图像的超分辨重建方法及其在生物医学领域的应用。In recent years, single-shotmagnetic resonance imaging（MRI） has been widely used in biomedicine, such as diffusion imaging, functional imaging, and realtime three-dimensional imaging, owing to its excellent temporal resolution. Among single-shot MRI approaches echo-planar imaging（EPI） stands out most. However, EPI still faces several limitations, particularly as a result of field inhomogeneity and of chemical shift effects that can become severein high fields. A novel single-shot MRI method was proposed based on spatiotemporal encoding, which provides a way to effectively alleviate the effects of field inhomogeneity and chemical shift while retaining high temporal-resolution character. In this work, we will review the principles and characters of spatiotemporally encoded MRI, and introduce the corresponding super-resolved reconstruction methods. In addition, we will present some major applications of spatiotemporally encoded MRI in biomedicine.

关 键 词：单扫描 时空编码 超分辨重建 

分 类 号：R445.2[医药卫生—影像医学与核医学]