A water-fat separation imaging method for the brain on low field magnetic resonance imaging  

作　　者：Hong-jun Tian1,Si-ping Chen2,Tian-fu Wang2,Xian-fen Diao2,Chong-xun Zheng1 1.Key Laboratory of Biomedical Information Engineering of Education Ministry,Xi’an Jiaotong University,Xi’an 710049 2.College of Information Engineering,Shenzhen University,Shenzhen 518060,China 

出　　处：《Journal of Pharmaceutical Analysis》2009年第4期272-276,共5页药物分析学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.60772147,60871060)

摘　　要：Water-fat separation is a particularly important problem for magnetic resonance imaging.Although many methods have been proposed,the reliability is still challenging.In this work,we have presented a method based on the combination of the branch-cut method and multigrid algorithm to get a more robust performance of water-fat separation.First,the branch-cut method is applied to identify residues,which violates the requirement that the interacting phase gradient around a closed path be zero.Residues and branches are marked to be zeros and filled to the weighting factor array.Then,the unwrapped phase array can be given by the multigrid algorithm.Finally,the Dixon method for water-fat separation is applied to the unwrapped phase array.Experiments for brain scanning on the 0.3T low field MRI system demonstrate the successful application of the proposed method.Water-fat separation is a particularly important problem for magnetic resonance imaging.Although many methods have been proposed,the reliability is still challenging.In this work,we have presented a method based on the combination of the branch-cut method and multigrid algorithm to get a more robust performance of water-fat separation.First,the branch-cut method is applied to identify residues,which violates the requirement that the interacting phase gradient around a closed path be zero.Residues and branches are marked to be zeros and filled to the weighting factor array.Then,the unwrapped phase array can be given by the multigrid algorithm.Finally,the Dixon method for water-fat separation is applied to the unwrapped phase array.Experiments for brain scanning on the 0.3T low field MRI system demonstrate the successful application of the proposed method.

关 键 词：water-fat separation DIXON weighted multigrid unwrapping 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]