核磁共振T2谱反演影响因素研究

摘要

核磁共振T2谱反演质量决定着核磁共振资料的应用效果.为了提高T2谱反演质量,需要对反演影响因素进行研究.首先对反演影响因素分类,然后利用正反演数值模拟技术对每种影响因素进行数值实验.结果表明,回波采集参数和质量,如回波个数、回波间隔、信噪比对T2谱反演质量影响较大;T2谱反演设置参数,如布点数、布点范围对反演质量影响较小;T2谱形态对反演质量也有较大影响.因此,为提高核磁共振资料的应用效果,除了提高回波信噪比外,还应优化回波采集参数;至于T2谱反演设置参数可以根据具体问题灵活选取.%Inversion quality of T2 spectrum determines the application effect of NMR data. It is necessary to study influence factors of the inversion for improving inversion quality. Firstly, to classify the influence factors of inversion, then to do numerical experiment of each influence factor by means of forward and inversion numerical simulation technique. The results show that the parameters and quality of echo acquisition, such as echo numbers, echo spacing and SNR, have the great influence on the inversion quality of T2 spectrum, the assigned parameters of T2 spectrum inversion, such as numbers and range of T2 value, has the little influence on the inversion quality, and the shape of T2 spectrum also has impact on the inversion. Therefore, In order to improve the application effect of NMR, it should optimize the parameter of echo acquisition besides improving echo SNR. As for the assigned parameters of T2 spectrum inversion, it could be selected flexibly according to the actual conditions.