| OPTOTRAK 3020 (Northern Digital, Inc. Waterloo, Ontario, Canada) is a pre-configured and pre-calibrated system allows fast set-up and immediate use for motion measurement. The system uses active markers with an accuracy of up to 0.1 mm and resolution of 0.01mm. It can collect 3D data with 3 markers at a frame rate of 450Hz. It’s size and weight makes it easy to move between locations. The system has been widely used in our laboratory to collect kinematic data in studies of gait, gait initiation, single limb stance balance, and hand movement. In most of applications, the collected 3D raw data is further processed using the lab-made programs. |