带标记线的心脏核磁共振图象分析综述

A Comprehensive Review of Tagged Cardiac MR Images Analysis

多年来,对心脏核磁共振(MR)图象的分析研究一直是医学图象领域的一个重要课题,上世纪80年代末期出现的标记技术引起了医学图象界的重视,因为标记线的引入改变了传统的心脏左心室的运动跟踪方式,所以也使得对带标记线的心脏核磁共振图象分析成为当前医学图象领域的一个研究热点.为了使人们对带标记线的心脏核磁共振图象分析技术的现状有一个概略了解,首先简要介绍了标记线的运动跟踪原理;接着,详细介绍了对带标记线的心脏MR图象的分割技术,其中包括左心室内外轮廓的分割和标记线的跟踪;而在左心室的形状恢复和运动重建方面,则详细介绍了几种主要的方法,包括可形变模型、随机模型、B样条模型、调和相方法和光流方法,由于应变分析可为临床提供直观的量化信息,为此也讨论了相关的理论方法和重要成果;最后指出了现存技术中的几个问题,这对进一步的研究工作是有益的.

Research on cardiac MR images analysis is a primary topic in the field of medical image for many years. The tagged MR imaging technique proposed at the end of 80's, last century, it was very attractive in that the tag line and tag plane provided a particular approach to track the motion of the left ventricle. It is a hot topic in the field of medical image at present to analyze the tagged cardiac MR images. In this paper, a brief introduction to tag-based motion tracking technique is presented at first, and sequentially, the existing methods for tagged image segmentation, including the epicardium and endocardium segmentation of left ventricle and tag stripes tracking, are inspected, as for shape recovery and motion reconstruction of left ventricle (LV), five approaches are discussed with comparison and summary of their merits and demerits, these methods are deformable model, stochastic model, B-spline based model, harmonic phase method and optical flow method. Another aspect of this topic is the strain analysis of LV which provides intuitive quantities for physicians. Here, some important results are also presented. In the last section of this paper, several problems in the existing methods are discussed and they are helpful for further work.