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首页> 外文期刊>Journal of Biomechanics >Accuracy and repeatability of an optical motion analysis system for measuring small deformations of biological tissues
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Accuracy and repeatability of an optical motion analysis system for measuring small deformations of biological tissues

机译：用于测量生物组织微小变形的光学运动分析系统的准确性和可重复性

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Optical motion analysis techniques have been widely used in biomechanics for measuring large-scale motions such as gait, but have not yet been significantly explored for measuring smaller movements such as the tooth displacements under load. In principle, very accurate measurements could be possible and this could provide a valuable tool in many engineering applications. The aim of this study was to evaluate accuracy and repeatability of the Qualisys ProReflex-MCU120 system when measuring small displacements, as a step towards measuring tooth displacements to characterise the properties of the periodontal ligament. Accuracy and repeatability of the system was evaluated using a wedge comparator with a resolution of 0.25 mu m to provide measured marker displacements in three orthogonal directions. The marker was moved in ten steps in each direction, for each of seven step sizes (0.5, 1, 2, 3, 5, 10, and 20 pm), repeated five times. Spherical and diamond markers were tested. The system accuracy (i.e. percentage of maximum absolute error in range/measurement range), in the 20-200 mu m ranges, was +1.17%, +1.67% and +1.31% for the diamond marker in x, y and z directions, while the system accuracy for the spherical marker was +1.81%, +2.37% and +1.39%. The system repeatability (i.e. maximum standard deviation in the measurement range) measured under the different days, light intensity and temperatures for five times, carried out step up and then step down measurements for the same step size, was +1.7, +2.3 and +1.9 mu m for the diamond marker, and +2.6, +3.9 and +1.9 pm for the spherical marker in x, y and z directions, respectively. These results demonstrate that the system suffices accuracy for measuring tooth displacements and could potentially be useful in many other applications. (c) 2005 Elsevier Ltd. All rights reserved.
机译：光学运动分析技术已广泛用于生物力学中，以测量诸如步态之类的大规模运动，但尚未进行显着探索以测量较小的运动，例如在负载下的牙齿位移。原则上，非常精确的测量是可能的，这可以在许多工程应用中提供有价值的工具。这项研究的目的是评估Qualisys ProReflex-MCU120系统在测量小位移时的准确性和可重复性，以此作为测量牙齿位移以表征牙周膜特性的一步。使用分辨率为0.25μm的楔形比较器评估系统的准确性和可重复性，以提供在三个正交方向上测得的标记位移。将标记器在每个方向上以十步移动，对于七个步长（0.5、1、2、3、5、10和20 pm）中的每一个，重复五次。测试了球形和菱形标记。在20、200微米范围内，系统在x，y和z方向上的菱形标记的系统精度（即，在范围/测量范围内的最大绝对误差的百分比）分别为+1.17％，+ 1.67％和+ 1.31％，球形标记器的系统精度为+1.81％，+ 2.37％和+ 1.39％。在不同的天数，光强度和温度下五次测量的系统重复性（即，测量范围内的最大标准偏差）为+ 1.7，+ 2.3和+，分别进行升压和降压测量菱形标记为1.9微米，球形标记在x，y和z方向分别为+ 2.6，+ 3.9和+1.9 pm。这些结果表明，该系统足以测量牙齿的位移，并且可能在许多其他应用中很有用。 （c）2005 Elsevier Ltd.保留所有权利。

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