The effects of electrode size and orientation on the sensitivity of myoelectric pattern recognition systems to electrode shift.
The effects of electrode size and orientation on the sensitivity of myoelectric pattern recognition systems to electrode shift.
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DOI：
10.1109/tbme.2011.2159216
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发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
Kuiken TA
中科院分区：
文献类型：
--
作者：
Young AJ;Hargrove LJ;Kuiken TA
用于假肢控制的肌电模式识别系统通常在受控的实验室环境中进行研究，但在临床可行之前仍需解决障碍。一个重要的障碍是在套接字不对准的情况下难以维持系统的可用性。在假体戴上和脱下过程中不可避免地会发生错位，从而产生电极接触位置的移位。我们研究了电极检测表面的大小和电极极的位置（电极方向）如何影响系统的鲁棒性与电极移位。在移位和无移位条件下，平行于肌纤维的电极优于垂直于肌纤维的电极（p<0.01）。另一个发现是电极移动方向的性能有显著差异（p<0.01）。垂直于肌肉纤维的位移比平行于肌肉纤维的位移更能降低分类精度和实时可控性。增加电极检测表面的尺寸有助于降低分类精度对垂直于肌肉纤维方向的电极位移的敏感性，但并不能提高模式识别系统的实时可控性。一个重要的临床结果是纵向和横向电极的组合产生了高度的可控性，无论有无电极移位，仅使用四个物理电极极位置。
Myoelectric pattern recognition systems for prosthesis control are often studied in controlled laboratory settings, but obstacles remain to be addressed before they are clinically viable. One important obstacle is the difficulty of maintaining system usability with socket misalignment. Misalignment inevitably occurs during prosthesis donning and doffing, producing a shift in electrode contact locations. We investigated how the size of the electrode detection surface and placement of electrode poles (electrode orientation) affected system robustness with electrode shift. Electrodes oriented parallel to muscle fibers outperformed electrodes oriented perpendicular to muscle fibers in both shift and no-shift conditions (p<0.01). Another finding was the significant difference (p<0.01) in performance for the direction of electrode shift. Shifts perpendicular to the muscle fibers reduced classification accuracy and real-time controllability much more than shifts parallel to the muscle fibers. Increasing the size of the electrode detection surface was found to help reduce classification accuracy sensitivity to electrode shifts in a direction perpendicular to the muscle fibers but did not improve the real-time controllability of the pattern recognition system. One clinically important result was that a combination of longitudinal and transverse electrodes yielded high controllability with and without electrode shift using only four physical electrode pole locations.