Abstract #1584

Optimal excitation location for magnetic resonance elastography of the supraspinatus muscle

Daiki Ito^1,2, Tomokazu Numano^1,2, Kazuyuki Mizuhara^2,3, Koichi Takamoto⁴, Takaaki Onishi¹, and Hisao Nishijo⁵

¹Department of Radiological Science, Graduate School of Human Health Science, Tokyo Metropolitan Unversity, Arakawa, Japan, ²Health Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, ³Department of Mechanical Engineering, Tokyo Denki University, Adachi, Japan, ⁴Department of Judo Neurophysiotherapy, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan, ⁵Department of System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan

It is difficult to palpate the supraspinatus muscle since it is difficult to determine their anatomic location superficially. Magnetic resonance elastography (MRE) can measure tissue stiffness quantitatively only if vibrations reach these tissues. To vibrate the tissues efficiently, it is necessary to determine the best excitation location. We investigated the excitation location suitable for MRE of the supraspinatus muscle. When the excitation location was placed on the trapezius muscle, the wave images represented clear wave propagation compared with those on the head of humerus. Therefore, optimal excitation location may be the trapezius muscle in the MRE of the supraspinatus muscle.

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