张立静 1,2王斌斌 1,2王玮 3武博 1,2,*张楠 1,2
作者单位
摘要
1 首都医科大学生物医学工程学院,北京 100069
2 首都医科大学临床生物力学应用基础研究北京市重点实验室,北京 100069
3 首都医科大学宣武医院骨科,北京 100053
在手术导航系统辅助的椎弓根螺钉内固定术中,术前与术中点云配准精度是影响导航定位效果的重要因素。由于术前与术中点云的获取方式不同,且术中暴露位置受限,两种非同源三维点云存在初始位姿差异大、重叠率低的问题,现有的配准算法在术前术中点云配准时容易失效且精度不高。为此,本文提出了一种椎弓根螺钉内固定术中非同源低重叠率点云的配准方法。首先,对术中点云进行降采样,对术前点云进行基于最远点采样的局部区域划分,选取其中的最优局部区域,与术中点云进行采样一致性初始配准;之后,采用迭代最近点算法进行进一步优化,实现点云的准确对齐。在本文所用数据集上,所提算法在术前术中点云配准实验中的平均旋转误差为0.406°,平移误差为0.474 mm,实现了初始位姿差异大、重叠率低的非同源术前术中点云的高精度配准,与现有算法相比,配准成功率从66.67%提高至100%。
医用光学 椎弓根螺钉内固定术 非同源点云 初始位姿差异大 低重叠率 点云配准 
中国激光
2023, 50(9): 0907108
Author Affiliations
Abstract
1 Department of Biomedical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, P. R. China
2 College of Information and Communication Engineering, Nanjing Institute of Technology, Nanjing, Jiangsu, P. R. China
Accurate placement of pedicle screw (PS) is crucial in spinal surgery. Developing new real-time intra-operative monitoring and navigation methods is an important direction of clinical application research. In this paper, we studied the spectrum along the fixation trajectory of PS in frequency domain to tackle the accuracy problem. Fresh porcine vertebrae, bovine vertebrae and ovine vertebrae were measured with the near-infrared spectrum (NIR) device to obtain the reflected spectrum from the vertebrae. Along the fixation trajectory of PS, average energy from different groups was calculated and used for identifying different tissues and compared to achieve the optimal recognition factor. Compared with the time domain approach, the frequency domain method could divide the spectra measured at different tissue points into different groups more stably and accurately, which could serve as a new method to assist the PS insertion. The results gained from this study are significant to the development of hi-tech medical instruments with independent intellectual property rights.
Pedicle screw fixation frequency domain optical reflectance vertebra 
Journal of Innovative Optical Health Sciences
2020, 13(1):

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!