Inertial measures of motion for clinical biomechanics: comparative assessment of accuracy under controlled conditions - changes in accuracy over time.
Inertial measures of motion for clinical biomechanics: comparative assessment of accuracy under controlled conditions - changes in accuracy over time.
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DOI：
10.1371/journal.pone.0118361
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Duval C
中科院分区：
文献类型：
--
作者：
Lebel K;Boissy P;Hamel M;Duval C
生物力学界对3D惯性运动跟踪设备（AHRS）的兴趣正在迅速增长。虽然这种跟踪装置的便利性似乎为临床生物力学评估开辟了一个全新的世界，但其局限性尚未得到广泛的记录。本研究的目的是：1）评估3个商用航姿系统的多个单位的绝对和相对精度随时间的变化; 2）确定影响航姿系统精度的不同误差来源，并记录它们如何随时间影响测量。本研究使用了一个装有仪器的万向架工作台，在该工作台上仔细地连接了AHRS模块，并进行了一系列速度控制的持续运动，包括2分钟的运动试验（2MT）和12分钟的多动态相位运动试验（12MDP）。绝对精度进行了评估，通过比较AHRS方向测量的光学金标准。使用试验期间模块之间相对方向的变化来评价相对准确度。在2MT期间，绝对和相对准确度都随着时间的推移而下降。12MDP试验显示多个阶段的准确度显著降低，但通过重置参考点和/或补偿每个阶段的初始惯性坐标系估计参考，可以显著提高准确度。在不同系统之间观察到的AHRS精度随时间的变化部分归因于动态估计误差，但最重要的是，归因于AHRS单元定位相同惯性系的能力。平均精度下获得的万向节表持续的运动条件下，AHRS是有前途的工具，在限制条件下使用的临床流动性评估。然而，需要改进AHRS模块之间的磁补偿和对准，以便AHRS在捕获临床结果方面充分发挥其潜力。
Interest in 3D inertial motion tracking devices (AHRS) has been growing rapidly among the biomechanical community. Although the convenience of such tracking devices seems to open a whole new world of possibilities for evaluation in clinical biomechanics, its limitations haven’t been extensively documented. The objectives of this study are: 1) to assess the change in absolute and relative accuracy of multiple units of 3 commercially available AHRS over time; and 2) to identify different sources of errors affecting AHRS accuracy and to document how they may affect the measurements over time. This study used an instrumented Gimbal table on which AHRS modules were carefully attached and put through a series of velocity-controlled sustained motions including 2 minutes motion trials (2MT) and 12 minutes multiple dynamic phases motion trials (12MDP). Absolute accuracy was assessed by comparison of the AHRS orientation measurements to those of an optical gold standard. Relative accuracy was evaluated using the variation in relative orientation between modules during the trials. Both absolute and relative accuracy decreased over time during 2MT. 12MDP trials showed a significant decrease in accuracy over multiple phases, but accuracy could be enhanced significantly by resetting the reference point and/or compensating for initial Inertial frame estimation reference for each phase. The variation in AHRS accuracy observed between the different systems and with time can be attributed in part to the dynamic estimation error, but also and foremost, to the ability of AHRS units to locate the same Inertial frame. Mean accuracies obtained under the Gimbal table sustained conditions of motion suggest that AHRS are promising tools for clinical mobility assessment under constrained conditions of use. However, improvement in magnetic compensation and alignment between AHRS modules are desirable in order for AHRS to reach their full potential in capturing clinical outcomes.
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影响因子：
2.4
作者：
Brennan, A.;Zhang, J.;Li, Q.
通讯作者：
Li, Q.
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作者：
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作者：
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作者：
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通讯作者：
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作者：
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通讯作者：
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