Kemp B, Janssen A J, van der Kamp B
Department of Neurology and Clinical Neurophysiology, University Hospital Leiden, The Netherlands.
Electroencephalogr Clin Neurophysiol. 1998 Dec;109(6):484-8. doi: 10.1016/s0924-980x(98)00053-8.
The study and diagnosis of movement disorders can be improved by monitoring body position simultaneously with the EMG.
We developed a monitor of the 3-dimensional (3D) orientation of body parts that can be applied in long-term ambulatory recordings in the daily life of a patient. The 3D sensor combines miniature sensors for earth's gravity and magnetism. It measures 60 x 50 x 10 mm and draws less than 1 mA of current from +/-5 V battery power. The non-horizontal direction of earth magnetism, as well as torque (pronation) of the body part, is corrected mathematically.
This results in a measurement of the 3D orientation of a body part in terms of vertical inclination and horizontal azimuth.
Calibration measurements indicate that this method is fairly accurate and practically applicable.
通过与肌电图同步监测身体位置，可改善运动障碍的研究与诊断。
我们开发了一种用于监测身体部位三维（3D）方向的监测器，可应用于患者日常生活中的长期动态记录。该3D传感器结合了用于测量地球重力和磁力的微型传感器。它的尺寸为60×50×10毫米，从±5伏电池电源汲取的电流小于1毫安。通过数学方法校正了地磁的非水平方向以及身体部位的扭矩（内旋）。
这使得能够根据垂直倾斜度和水平方位测量身体部位的3D方向。
校准测量表明该方法相当准确且实际可行。
