Abstract #3337

Evaluation of precision of the psoas major muscle MR elastography

Tetsushi Habe^1,2, Tomokazu Numano^1,3, Daiki Ito^1,2,3, Toshiki Maeno¹, Kazuyuki Mizuhara⁴, Kouichi Takamoto⁵, and Hisao Nishijo⁶

¹Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan, ²Office of Radiation Technology, Keio University Hospital, Tokyo, Japan, ³Human Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan, ⁴Department of Mechanical Engineering, Tokyo Denki University, Tokyo, Japan, ⁵Department of Sport and Health Sciences, University of Ease Asia, Yamaguchi, Japan, ⁶Department of System Emotional Science, Toyama University, Toyama, Japan

We developed psoas major muscle (PM) MR elastography (MRE) technique and reported shear modulus of the PM for the first time in the world. However, measurement precision (repeatability and reproducibility) of this technique was not assessed. In this study, repeatability with three repetitions and reproducibility with different three operators were evaluated. Repeatability of this technique was about the same as required for clinical liver MRE and reproducibility was almost perfect. The original vibration pad was focused on generating shear wave in the PM efficiently. The development of the vibration pad specialized for PM MRE resulted in acceptable repeatability and reproducibility.

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