Changes to Muscle T2 after Single-finger Exercise Measured with 0.2T MR Imaging

Masayoshi TAKAMORI; Sumikazu AKIYAMA; Kazuya YOSHIDA; Yoshie IMAIZUMI-OHASHI; Mika YOKOI-HAYAKAWA; Fumie YAMAZAKI; Hiroshi OOTSUKA; Tomoyuki HAISHI; Yoshiteru SEO

doi:10.2463/mrms.2014-0090

Technical Notes

Changes to Muscle T₂ after Single-finger Exercise Measured with 0.2T MR Imaging

Masayoshi TAKAMORI, Sumikazu AKIYAMA, Kazuya YOSHIDA, Yoshie IMAIZUMI-OHASHI, Mika YOKOI-HAYAKAWA, Fumie YAMAZAKI, Hiroshi OOTSUKA, Tomoyuki HAISHI, Yoshiteru SEO

Author information

Masayoshi TAKAMORI
Department of Regulatory Physiology, Dokkyo Medical University School of Medicine
Department of Physical Therapy, Aoi Medical Academy
Sumikazu AKIYAMA
Department of Regulatory Physiology, Dokkyo Medical University School of Medicine
Department of Rehabilitation, University of Human Arts and Sciences, Faculty of Health Sciences
Kazuya YOSHIDA
Department of Regulatory Physiology, Dokkyo Medical University School of Medicine
Department of Rehabilitation, University of Human Arts and Sciences, Faculty of Health Sciences
Yoshie IMAIZUMI-OHASHI
Department of Regulatory Physiology, Dokkyo Medical University School of Medicine
Mika YOKOI-HAYAKAWA
Department of Regulatory Physiology, Dokkyo Medical University School of Medicine
Fumie YAMAZAKI
Department of Regulatory Physiology, Dokkyo Medical University School of Medicine
Hiroshi OOTSUKA
Department of Rehabilitation, University of Human Arts and Sciences, Faculty of Health Sciences
Tomoyuki HAISHI
MRTechnology
Yoshiteru SEO Corresponding author
Department of Regulatory Physiology, Dokkyo Medical University School of Medicine

Keywords: magnetic resonance imaging (MRI), muscle, patient positioning, reproducibility, transverse relaxation time

JOURNAL OPEN ACCESS

2015 Volume 14 Issue 4 Pages 359-366

DOI https://doi.org/10.2463/mrms.2014-0090

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Abstract

We constructed an arm holder for muscle exercise from a forearm-shaped plastic shell and magnetic resonance (MR) imaging position markers and determined the echo time (39 ms) for T₂-weighted spin-echo MR imaging from T₂ values of the exercised (50 ms) and resting (32 ms) muscle at 0.2 tesla. The smallest detectable muscle was the extensor digiti minimi muscle (cross-sectional area 25 mm²). This combination could be useful to monitor finger exercise in patients undergoing physical therapy.

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