Accuracy of an electromagnetic tracking device: A study of the optimal operating range and metal interference
Accuracy of an electromagnetic tracking device: A study of the optimal operating range and metal interference
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DOI：
10.1016/0021-9290(96)83335-5
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发表时间：
1996-06-01
影响因子：
2.4
通讯作者：
King, GJW
中科院分区：
文献类型：
--
作者：
Milne, AD;Chess, DG;King, GJW
对生物力学研究中常用的直流磁跟踪装置的定位和旋转精度进行了评价。还研究了不同金属的影响，以确定实验测试夹具或矫形植入物在工作区域内引起干扰的可能性。通过将设备输出与来自校准网格板或材料试验机的已知运动进行比较，评估位置和旋转数据的准确性和分辨率。通过将圆柱形金属样品放置在整个工作场所的固定位置，并比较引入每种金属样品前后的设备读数，评估不同金属的影响。位置测试表明，最佳的工作范围是发射机与接收机的距离在22.5 ~ 64.0 cm之间。在此范围内，平均位置误差为步长的1.8%，分辨率为0.25 mm。在1-20度范围内的平均旋转误差为旋转增量的1.6%，旋转分辨率为0.1度。在测试的金属合金中，只有低碳钢会产生明显的干扰，当样品靠近接收器时，这种干扰最大。在这个位置，低碳钢产生了5.26厘米的位置差和9.75度的角差。该装置被发现对常用的矫形合金不敏感。在本研究中，电磁跟踪装置在其最佳工作范围内使用时，其位置和旋转误差小于2%。这种准确性加上它对骨科合金的不敏感，应该使它适用于各种肌肉骨骼研究调查。1996爱思唯尔科学有限公司
The positional and rotational accuracy of a direct-current magnetic tracking device commonly used in biomechanical investigations was evaluated. The effect of different metals was also studied to determine the possibility of interference induced by experimental test fixtures or orthopaedic implants within the working field. Positional and rotational data were evaluated for accuracy and resolution by comparing the device output to known motions as derived from a calibrated grid board or materials testing machine. The effect of different metals was evaluated by placing cylindrical metal samples at set locations throughout the working field and comparing the device readings before and after introducing each metal sample. Positional testing revealed an optimal operational range with the transmitter and receiver separation between 22.5 and 64.0 cm. Within this range the mean positional error was found to be 1.8% of the step size, and resolution was determined to be 0.25 mm. The mean rotational error over a 1-20 degrees range was found to be 1.6% of the rotational increment, with a rotational resolution of 0.1 degrees. Of the metal alloys tested only mild steel produced significant interference, which was maximum when the sample was placed adjacent to the receiver. At this location the mild steel induced a positional difference of 5.26 cm and an angular difference of 9.75 degrees. The device was found to be insensitive to commonly used orthopaedic alloys. In this study, the electromagnetic tracking device was found to have positional and rotational errors of less than 2%, when utilized within its optimal operating range. This accuracy combined with its insensitivity to orthopaedic alloys should make it suitable for a variety of musculoskeletal research investigations. (C) 1996 Elsevier Science Ltd.