并行磁共振成像的编码与重建技术  

The Encoding and Reconstruction of Parallel MRI

作　　者：刘晓芳[1,2] 陈永利[2] 叶修梓[1] 

机构地区：[1]浙江大学计算机科学与技术学院,杭州310027 [2]中国计量学院信息工程学院,杭州310018

出　　处：《生物医学工程学杂志》2010年第2期471-475,共5页Journal of Biomedical Engineering

摘　　要：近几年出现的并行磁共振成像推动了并行成像技术的发展,该技术的主要特点是欠采样多线圈数据的图像重建。根据这个特点,并行成像技术分成两类:k空间方法和图像域方法。本文首先回顾了基本的并行成像重建算法,指出了不同重建算法应遵循的基本原则。然后详细阐述了重建中的编码机制和采样问题,并对两类重建算法进行了比较。最后,本文讨论了并行成像中的噪声传递和抑制问题,并总结了并行成像中的关键问题。The advent of parallel MRI over recent years has prompted a variety of techniques for performing parallel imaging.The main distinguishing feature among these is the specific way of solving the problem of image reconstruction from undersampled multiple-coil data.The clearest distinction in this respect is that between k-space method and image-domain method.The present paper reviews the basic reconstruction approaches,aiming to emphasize the common principles along with actual differences.To this end the treatment starts with an elaboration of the encoding mechanisms and sampling strategies that define the reconstruction task.Based on these considerations,the distinction between k-space and image-domain approaches is given.At the close of this paper are presented discussioins concerning noise propagation and control in parallel imaging and an outlook upon key issues to be addressed in the future.

关 键 词：并行磁共振成像 空间谐波同步采集 敏感度编码 全局自动校准部分并行采集 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]