3D-DIC技术颌面外科导航的体外初步研究

In vitro study of 3D-DIC technology navigation system of maxillofacial surgery

目的通过体外头颅模型试验,测量基于三维图像关联技术(3D-DIC)搭建的导航系统定位精度及跟踪精度。方法通过3D-DIC导航系统在3D打印头颅模型上选取不同分布模式的标记点进行注册,测量定位误差,比较注册点分布不同对于注册精度的影响,于3D打印头颅模型上模拟Lefort I型截骨线进行截骨,机械臂把持牙槽突骨段在三维空间内作任意移动,3D-DIC系统测量其运动轨迹,并与机械臂末端记录相对比,测量跟踪精度。采用独立样本t检验比较不同运动方向的跟踪精度。结果3D-DIC导航精度为(0.694±0.017)mm。3D-DIC跟踪精度为(0.174±0.089)mm,跟踪精确性良好。结论 3D-DIC导航系统拥有良好的定位精度及跟踪精度。

Objective To investigate the positioning and tracking accuracy of three dimensional-digital image correlation (3D-DIC) navigation system. Methods The investigation was carried out using a 3D printed plastic model. Registration accuracy was tested and compared. Lefort I osteotomy was applied on the model and the teeth bearing bone segment was fixed with a robotic arm and moved randomly in space. The tracing accuracy was tested by calculating the position error of checking points read from 3D-DIC system and robotic control system. Independent samples t-test was used to compare the tracking accuracy. Results The mean error of 3D-DIC navigation system was (0.694±0.017) mm. The tracking error of 3D-DIC navigation system was (0.174±0.089) mm. Conclusion 3D-DIC navigation system had precise positioning accuracy and tracking accuracy.