磁共振截断频谱信号重建的奇异谱分析法  

SIGNAL RECONSTRUCTION FROM MR TRUNCATED DATA USING SINGULARITY SPECTRUM ANALYSIS

作　　者：骆建华[1] 楼正国[1] 

机构地区：[1]上海交通大学生物医学工程系,浙江大学生命科学与医学工程系,上海,200030,杭州,310027

出　　处：《电子科学学刊》1999年第3期397-403,共7页

基　　金：国家自然科学基金(No.39870211);上海交通大学高科技发展基金

摘　　要：本文提出一种消除磁共振(MR)图像截断伪影的新方法。在我们的方法中,把任何信号频谱表示为由信号奇异点为参量的频谱函数的加权和,奇异点和加权系数从截断频谱数据中提取,从而准确恢复MR截断频谱的高频分量,达到MR消除截断伪影之目的。实际和模拟结果都表明这种方法效果高于现有方法。A new method of truncation MR artifact reduction is proposed in this paper. In the method, any digital signal spectrum can be expressed as the weighted sum of spectrum functions related to the signal singularity locations. The singularity locations and weight coefficients can be extracted from MR truncation spectrum data. Thus we can gain the high spectrum using the sum and reduce the truncation artifact in MR image. Experiment and simulation results show that this method gives much better reconstructed image than available methods.

关 键 词：奇异谱函数 奇异点 磁共振成像 医学图像诊断 

分 类 号：R445[医药卫生—影像医学与核医学]