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Effect of the Region of Interest in Ultrasound Elastography Examination of Trapezius Muscle Stiffness
Get PDF僧帽筋の硬さを超音波エラストグラフィ検査で測定した報告は散見されるものの，ストレインエ
ラストグラフィ検査における僧帽筋内のregion of interest（ROI：関心領域）設定部位は統一され
ていない．そこで，本研究ではROI を僧帽筋の厚み中央1/3 に設定した場合と僧帽筋全体に設定
した場合について比較を行い，より隣接組織の影響を受けにくく僧帽筋本来の硬さを反映した値が
求められる方法はどちらか検討を行った．若年成人女性24 名を対象とし，ストレインエラストグ
ラフィ検査を用い2 種類のROI 設定についてそれぞれ硬さを表すstrain ratio を求めた．その結果，
それぞれのstrain ratio と筋硬度計値，脂肪厚，筋厚との相関を検討すると，ROI を僧帽筋全体に
設定した場合に脂肪厚などの影響を受けることが分かった．また，ROI を筋全体に設定した時より
も，僧帽筋の厚み中央1/3 に設定した時の方がstrain ratio は有意に高いという結果が得られた．
以上より，僧帽筋の硬さをストレインエラストグラフィ検査で測定する際には，ROI は隣接組織の
影響を受けにくい僧帽筋の中央1/3 に設定することが望ましいと考えられた．Although there are some reports on measuring the stiffness of the trapezius muscle by
ultrasound elastography, the region of interest (ROI) has not been standardized. Therefore,
in this study, two different ROIs were set: at the central 1/3 of the thickness of the trapezius
muscle and the entire trapezius muscle. We then examined which method was less susceptible
to the influence of adjacent tissues and could obtain values that reflected the original stiffness
of the trapezius muscle. Twenty-four young adult females were included in the study. Using
strain elastography, strain ratio, a measure of stiffness, was determined for each of the two ROI
settings. The results showed that the correlation between each strain ratio and muscle stiffness
values, fat thickness, and muscle thickness revealed that the ROI was affected by fat thickness
and other factors when it was set to encompass the entire trapezius muscle. Additionally, the
strain ratio was significantly higher when the ROI was set at the central 1/3 of the thickness of
the trapezius muscle than when it was set at the entire muscle. This study suggests that when
measuring trapezius muscle stiffness by strain elastography, it is recommended that the ROI
be set at the central 1/3 of the trapezius muscle, which is less susceptible to the influence of
adjacent tissues
