Compensating for Soft-Tissue Artifact Using the Orientation of Distal Limb Segments During Electromagnetic Motion Capture of the Upper Limb
Compensating for Soft-Tissue Artifact Using the Orientation of Distal Limb Segments During Electromagnetic Motion Capture of the Upper Limb
复制标题
DOI：
10.1115/1.4053366
复制
发表时间：
2022-07-01
影响因子：
1.7
通讯作者：
Charles, Steven K.
中科院分区：
文献类型：
--
作者：
Bons, Zachary;Dickinson, Taylor;Charles, Steven K.
大多数运动捕捉测量遭受软组织伪影（STA）。特别受影响的是围绕肢体节段的长轴的旋转，例如肱骨内旋-外旋（HIER）和前臂旋前-旋后（FPS）。不幸的是，大多数现有的方法来补偿STA是专为光电运动捕捉系统。我们提出并评估了一种STA补偿方法，该方法（1）补偿HIER和/或FPS中的STA，（2）专门为电磁运动捕捉系统开发，以及（3）不需要额外的校准或数据。为了补偿STA，HIER角度的计算依赖于前臂取向，并且FPS角度的计算依赖于手取向。为了测试这种方法，我们记录了8名受试者的全臂运动数据，并比较了根据STA补偿的渐进水平计算的关节角度轨迹。补偿后的HIER和FPS角显著大于未补偿角。虽然STA补偿对其他关节角度（除了HIER和FPS）的影响通常是适度的，但在某些条件下，在某些自由度上可以看到显着的影响。总体而言，该方法在上肢的大部分活动范围内按预期发挥作用，但在极度肘关节伸展和极度腕关节屈曲-伸展时变得不稳定。具体来说，不建议在肘关节完全伸展、腕关节完全屈曲或腕关节完全伸展的20度范围内进行运动。由于该方法不需要额外的数据校准，因此可以追溯应用于收集的数据，而无需补偿STA。
Most motion capture measurements suffer from soft-tissue artifacts (STA). Especially affected are rotations about the long axis of a limb segment, such as humeral internal-external rotation (HIER) and forearm pronation-supination (FPS). Unfortunately, most existing methods to compensate for STA were designed for optoelectronic motion capture systems. We present and evaluate an STA compensation method that (1) compensates for STA in HIER and/or FPS, (2) is developed specifically for electromagnetic motion capture systems, and (3) does not require additional calibration or data. To compensate for STA, calculation of HIER angles relies on forearm orientation, and calculation of FPS angles rely on hand orientation. To test this approach, we recorded whole-arm movement data from eight subjects and compared their joint angle trajectories calculated according to progressive levels of STA compensation. Compensated HIER and FPS angles were significantly larger than uncompensated angles. Although the effect of STA compensation on other joint angles (besides HIER and FPS) was usually modest, significant effects were seen in certain degrees-of-freedom under some conditions. Overall, the method functioned as intended during most of the range of motion of the upper limb, but it becomes unstable in extreme elbow extension and extreme wrist flexion-extension. Specifically, this method is not recommended for movements within 20 deg of full elbow extension, full wrist flexion, or full wrist extension. Since this method does not require additional calibration of data, it can be applied retroactively to data collected without the intent to compensate for STA.