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Abstract #3308

Simultaneous acquisition of multi-phase offset for rapid imaging in MR elastography (SAMURAI-MRE) using a multi-echo sequence

Daiki Ito1,2,3, Tomokazu Numano1,3, Tetsushi Habe1,2, Toshiki Maeno1, Kazuyuki Mizuhara3,4, Surendra Maharjan1, Kouichi Takamoto5, and Hisao Nishijo6
1Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan, 2Office of Radiation Technology, Keio University Hospital, Tokyo, Japan, 3Health Research Institute, National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan, 4Department of Mechanical Engineering, Tokyo Denki University, Tokyo, Japan, 5Department of sport and Health Sciences, Faculty of Human Sciences, University of East Asia, Yamaguchi, Japan, 6System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan

MR elastography (MRE) requires acquisitions of multiple phase offset images. Patient movement between acquisitions of phase offset images is not only difficult to be detected, but also leads to calculate shear modulus incorrectly. To resolve this problem, we present a novel MRE technique that can acquire multiple phase offset images simultaneously (SAMURAI-MRE) using a motion-encoding gradient (MEG)-less multi-echo sequence. MRE images obtained at spin-echo (SE)- and gradient-echo (GRE)-based SAMURAI-MRE were compared with those at conventional SE- and GRE-based MEG-less multi-echo MRE. The results demonstrate that it is possible to perform SAMURAI-MRE, and SE-based SAMURAI-MRE was superior to GRE-based SAMURAI-MRE.

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