Abstract #3308

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

Daiki Ito^1,2,3, Tomokazu Numano^1,3, Tetsushi Habe^1,2, Toshiki Maeno¹, Kazuyuki Mizuhara^3,4, 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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