Upper Limb Kinematics Using Inertial and Magnetic Sensors: Comparison of Sensor-to-Segment Calibrations.
Upper Limb Kinematics Using Inertial and Magnetic Sensors: Comparison of Sensor-to-Segment Calibrations.
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DOI：
10.3390/s150818813
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发表时间：
2015-07-31
期刊：
影响因子：
--
通讯作者：
Savescu A
中科院分区：
文献类型：
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作者：
Bouvier B;Duprey S;Claudon L;Dumas R;Savescu A
磁惯性测量单元传感器（MIMU）显示上肢运动学定量评估的高潜力，因为它们允许监测动态测量。传感器到部分校准步骤，包括建立MIMU传感器和人体部分之间的关系，在关节角度的全局精度中起着重要的作用。本研究的目的是通过检查真实度（“接近参考”）和精度（再现性）有效性标准，比较基于MIMU的腕关节、肘关节和肩关节角度估计的传感器到段校准。十名受试者与三名不同的操作员进行了五次会话。三类校准进行了研究：段轴等于技术MIMU轴（TECH），段轴产生的静态姿势（STATIC），和功能运动（FUNCT）过程中产生的。在每个关节的最大单轴运动期间比较校准，加上额外的多关节运动。关节角度在5° ~ 10 °范围内，总体上呈现出较好的真实度和很好的精度。除了少数情况外，只强调了校准之间的微小差异。基于MIMU的关节角度数据的非常好的整体精度（真实度和精度）似乎更依赖于实验程序（操作员培训）的严格程度，而不是校准本身的选择。
Magneto-Inertial Measurement Unit sensors (MIMU) display high potential for the quantitative evaluation of upper limb kinematics, as they allow monitoring ambulatory measurements. The sensor-to-segment calibration step, consisting of establishing the relation between MIMU sensors and human segments, plays an important role in the global accuracy of joint angles. The aim of this study was to compare sensor-to-segment calibrations for the MIMU-based estimation of wrist, elbow, and shoulder joint angles, by examining trueness (“close to the reference”) and precision (reproducibility) validity criteria. Ten subjects performed five sessions with three different operators. Three classes of calibrations were studied: segment axes equal to technical MIMU axes (TECH), segment axes generated during a static pose (STATIC), and those generated during functional movements (FUNCT). The calibrations were compared during the maximal uniaxial movements of each joint, plus an extra multi-joint movement. Generally, joint angles presented good trueness and very good precision in the range 5°–10°. Only small discrepancy between calibrations was highlighted, with the exception of a few cases. The very good overall accuracy (trueness and precision) of MIMU-based joint angle data seems to be more dependent on the level of rigor of the experimental procedure (operator training) than on the choice of calibration itself.