Yamamoto Atsushi, Yamakoshi Yoshiki, Ohsawa Takashi, Shitara Hitoshi, Ichinose Tsuyoshi, Shiozawa Hiroyuki, Sasaki Tsuyoshi, Hamano Noritaka, Yuminaka Yasushi, Takagishi Kenji
Department of Orthopaedic Surgery, Gunma University Graduate School of Medicine, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan.
Department of Electronics and Informatics, Gunma University Graduate School of Science and Technology, Kiryu, Gunma, Japan.
J Med Ultrason (2001). 2018 Jan;45(1):129-136. doi: 10.1007/s10396-017-0803-8. Epub 2017 Jun 28.
Skeletal muscle stiffness is thought to be the result of increased tissue hardness, but measurement accuracy has been dependent on operator technique. We have proposed a novel shear wave real-time imaging method (color Doppler shear wave imaging: CD SWI) with continuous shear waves excited from the tissue surface by a mechanical vibrator.
Using the method, shear wave velocity was measured for the upper trapezius muscle. Adaptive shear wave velocity measurement by means of quality estimation of shear wave wavefront was adopted. We recruited 23 male volunteers with no history of orthopedic disease and recorded shear wave propagation to assess the intra- and inter-observer reliability. For intra-observer reliability, one observer took two measurements separated by a time delay, and the intra-class correlation coefficient (ICC) was calculated (1,1). For inter-observer reliability, ICC (2,1) was calculated from both observers' measurements.
Mean propagation speed was 3.75 ± 0.47 (first) and 3.71 ± 0.49 m/s (second) for Observer A (ICC (1,1) = 0.91 [95% CI 0.76-0.96]) and 3.80 ± 0.53 m/s for Observer B (ICC (2,1) = 0.83 [95% CI 0.56-0.94]).
This result suggests that our technique is satisfactorily reliable and has potential for future application in various fields, such as evaluation of muscle condition or the effects of rehabilitation.
骨骼肌僵硬被认为是组织硬度增加的结果，但测量准确性一直依赖于操作者技术。我们提出了一种新型剪切波实时成像方法（彩色多普勒剪切波成像：CD SWI），通过机械振动器从组织表面激发连续剪切波。
使用该方法测量上斜方肌的剪切波速度。采用基于剪切波波前质量估计的自适应剪切波速度测量方法。我们招募了23名无骨科疾病史的男性志愿者，记录剪切波传播情况以评估观察者内和观察者间的可靠性。对于观察者内可靠性，一名观察者进行两次测量，中间有时间间隔，并计算组内相关系数（ICC）（1,1）。对于观察者间可靠性，根据两名观察者的测量结果计算ICC（2,1）。
观察者A的平均传播速度第一次为3.75±0.47，第二次为3.71±0.49 m/s（ICC（1,1）=0.91 [95% CI 0.76 - 0.96]），观察者B为3.80±0.53 m/s（ICC（2,1）=0.83 [95% CI 0.56 - 0.94]）。
该结果表明我们的技术具有令人满意的可靠性，并且在未来各种领域具有应用潜力，如肌肉状况评估或康复效果评估。
