Phase Unwrapping in Magnetic Resonance Elastography  

作　　者：Surendra Maharjan Tomokazu Numano Tetsushi Habe Daiki Ito Takamichi Ueki Keisuke Igarashi Toshiki Maeno 

机构地区：[1]Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan [2]Health Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan [3]Office of Radiation Technology, Keio University Hospital, Tokyo, Japan

出　　处：《Open Journal of Medical Imaging》2018年第4期111-125,共15页医学影像期刊（英文）

摘　　要：Phase Unwrapping (PU) is an ill-posed problem in Magnetic Resonance Elastography (MRE). The phase information is not usable until the phases are retrieved by using PU algorithms. In this present study, we attempt to determine the ideal PU method for MRE using both phantom and volunteer psoas major (PM) muscle images. All the MRE experiments were carried out in Philips MRI (Achieva 3.0 T, Best, The Netherlands). A multi-echo gradient-echo MRE pulse sequence was employed and the four PU methods were considered based on their easy user platform. They are namely, Minimum Discontinuity (MD), Laplacian-Based Estimate (LBE), Region Growing (RG) and Dilate-Erode (DE) Propagate. Phantom images were successfully unwrapped by all four methods, whereas MD and LBE could only unwrap PM muscle images properly. RG and DE failed to unwrap the PM muscle images.Phase Unwrapping (PU) is an ill-posed problem in Magnetic Resonance Elastography (MRE). The phase information is not usable until the phases are retrieved by using PU algorithms. In this present study, we attempt to determine the ideal PU method for MRE using both phantom and volunteer psoas major (PM) muscle images. All the MRE experiments were carried out in Philips MRI (Achieva 3.0 T, Best, The Netherlands). A multi-echo gradient-echo MRE pulse sequence was employed and the four PU methods were considered based on their easy user platform. They are namely, Minimum Discontinuity (MD), Laplacian-Based Estimate (LBE), Region Growing (RG) and Dilate-Erode (DE) Propagate. Phantom images were successfully unwrapped by all four methods, whereas MD and LBE could only unwrap PM muscle images properly. RG and DE failed to unwrap the PM muscle images.

关 键 词：Phase Unwrapping Magnetic Resonance ELASTOGRAPHY Minimum DISCONTINUITY Laplacian-Based Estimate Region GROWING Dilate-Erode PROPAGATE 

分 类 号：R73[医药卫生—肿瘤]