Mohr Lisa, Vogt Lutz, Wilke Jan
Department of Sports Medicine, Goethe University Frankfurt, 60323 Frankfurt/Main, Germany.
Life (Basel). 2021 Jan 30;11(2):104. doi: 10.3390/life11020104.
During dynamic ultrasound assessments, unintended transducer movement over the skin needs to be prevented as it may bias the results. The present study investigated the validity of two methods quantifying transducer motion. An ultrasound transducer was moved on a pre-specified 3 cm distance over the semitendinosus muscle of eleven adults (35.8 ± 9.8 years), stopping briefly at intervals of 0.5 cm. Transducer motion was quantified (1) measuring the 2-D displacement of the shadow produced by reflective tape (RT) attached to the skin and (2) using a marker-based, three-dimensional movement analysis system (MAS). Differences between methods were detected with Wilcoxon tests; associations were checked by means of intraclass correlation coefficients (ICC 3.1) and Bland-Altman plots. Values for RT (r = 0.57, < 0.001) and MAS (r = 0.19, = 0.002) were significantly higher than true distances (TD). Strong correlations were found between RT and TD (ICC: 0.98, < 0.001), MAS and TD (ICC: 0.95, < 0.001), and MAS and RT (ICC: 0.97, < 0.001). Bland-Altman plots showed narrow limits of agreement for both RT (-0.49 to 0.13 cm) and MAS (-0.49 to 0.34 cm) versus TD. RT and MAS are valid methods to quantify US transducer movement. In view of its low costs and complexity, RT can particularly be recommended for application in research and clinical practice.
在动态超声评估过程中，需要防止换能器在皮肤上意外移动，因为这可能会使结果产生偏差。本研究调查了两种量化换能器运动方法的有效性。在11名成年人（35.8±9.8岁）的半腱肌上，将超声换能器沿预先设定的3厘米距离移动，每隔0.5厘米短暂停顿。通过以下两种方法量化换能器运动：（1）测量附着在皮肤上的反光胶带（RT）产生的阴影的二维位移；（2）使用基于标记的三维运动分析系统（MAS）。采用Wilcoxon检验检测两种方法之间的差异；通过组内相关系数（ICC 3.1）和Bland-Altman图检查相关性。RT（r = 0.57，<0.001）和MAS（r = 0.19，= 0.002）的值显著高于真实距离（TD）。RT与TD（ICC：0.98，<0.001）、MAS与TD（ICC：0.95，<0.001）以及MAS与RT（ICC：0.97，<0.001）之间均存在强相关性。Bland-Altman图显示，RT（-0.49至0.13厘米）和MAS（-0.49至0.34厘米）与TD的一致性界限较窄。RT和MAS是量化超声换能器运动的有效方法。鉴于其成本低且操作简单，RT尤其推荐用于研究和临床实践。
