陀螺仪记录转移自然头位系统的建立及其精度检测

发布时间：2019-04-30 10:43

【摘要】：目的:基于陀螺仪、三维手术设计软件建立自然头位(nature head position,NHP)记录及转移系统,在手术设计软件中将"数字头颅"重置于自然头位,评估该系统的可行性和精确度。方法:基于陀螺仪和三维编辑软件建立自然头位记录及转移系统。(1)通过牙合叉、面弓等装置将陀螺仪与患者头部固联。患者佩戴陀螺仪装置,通过镜像调整头颅位姿到自然头位后,用陀螺仪记录即刻头颅的俯仰角(Pitch)、横滚角(Roll)和侧偏角(Yaw),这是实际NHP。(2)当陀螺仪位姿为零位时(Pitch=0°,Roll=0°,Yaw=0°),进行锥体束CT扫描,三维重建后得到标准陀螺仪模型。(3)将患者数字头颅与标准陀螺仪模型配准融合,两物体共同旋转至记录的NHP位姿(Pitch、Roll,Yaw),数字头颅在虚拟环境下重置于NHP,是为虚拟NHP。(4)采用标准立方体作为试件,将其摆放于任意位姿,分别记录其实际位姿和虚拟位姿,进行30次实验,计算实际位姿与虚拟位姿的差异(ΔPitch,ΔRoll,ΔYaw),如符合正态分布,对实际位姿与虚拟位姿的3个角度分别进行配对t检验,对它们的相关性进行Pearson检验。结果:陀螺仪装置能够记录患者头颅位姿,并可通过软件将该位姿转移至手术设计系统。ΔPitch=0.03°±0.28°,ΔRoll=0.03°±0.23°,ΔYaw=0.07°±0.49°,立方体实际位姿与转换后虚拟位姿相应角度差异均无统计学意义(P0.05);Pearson检验得到两者在α=0.01水平(双向)显著相关(r=1.00)。结论:基于陀螺仪装置和三维手术设计软件的自然头位记录、转移系统精度满足正颌外科手术设计需求,操作流程具备可行性。
[Abstract]:Aim: to establish a natural cephalic position (nature head position,NHP (natural cephalic position) recording and transferring system based on gyroscope and 3D surgical design software, and to reposition the "digital skull" into the natural cephalic position in the surgical design software, and to evaluate the feasibility and accuracy of the system. Methods: a natural head position recording and transferring system was established based on gyroscope and three-dimensional editing software. (1) the gyro was connected with the head of the patient by occlusal fork and face arch. After the patient wore a gyroscope device and adjusted the head position to the natural head position by mirror image, the pitching angle (Roll) and the lateral deviation angle (Yaw), of the immediate head were recorded by the gyroscope. The (Pitch), angle and the lateral angle (Yaw), of the immediate head were recorded by the gyroscope. This is the actual NHP. (2) when the position of the gyroscope is zero (Pitch=0 掳, Roll=0 掳, Yaw=0 掳), the cone beam CT scan is performed and the standard gyroscope model is obtained after three-dimensional reconstruction. (3) the patient's digital head is fused with the standard gyroscope model. The two objects rotate together to the recorded NHP posture (Pitch,Roll,Yaw), and the digital head is repositioned in NHP, in the virtual environment by using a standard cube as the specimen for the virtual NHP. (4) and placing it in any position. The actual and virtual positions were recorded, and 30 experiments were carried out to calculate the difference between the actual and virtual positions (螖 Pitch, 螖 Roll, 螖 Yaw), and then paired t-test was carried out on the three angles of the actual position and the virtual posture, if it was in accordance with the normal distribution. Their correlation was tested by Pearson. Results: the gyroscope can record the patient's head position and transfer it to the surgical design system by software. 螖 Pitch=0.03 掳卤0.28 掳, 螖 Roll=0.03 掳卤0.23 掳, 螖 Yaw=0.07 掳卤0.49 掳. There was no significant difference between the actual posture of cube and the corresponding angle of virtual posture after transformation (P0.05). Pearson test showed a significant correlation between the two levels (r = 0. 01) (r = 1. 00). Conclusion: based on the natural head position recording of gyroscope and 3D surgical design software, the accuracy of the transfer system can meet the requirements of orthognathic surgery design, and the operation procedure is feasible.
【作者单位】：北京大学口腔医学院·口腔医院口腔颌面外科;
【基金】：国家高技术研究发展计划(863计划,2012AA041606) 首都医学发展基金(2011-4025-03)资助~~
【分类号】：R783.5

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