摘要
目的利用2D/3D图像配准技术建立脊柱在体三维运动检测系统。方法采集成人腰椎CT影像,并采集两个不同位置时脊柱互成直角的X线平片,进行腰椎L3、L4三维重建,并在软件中建立虚拟X线摄像场景进行腰椎投影,再现互成直角的虚拟X线影像,采用2D/3D图像配准方法与真实X线影像相配准,还原摄平片时L3、L4的位置,将配准结果导入图像处理软件后计算两种位置之间L3的相对位移及角度变化。结果利用2D/3D图像配准方法实现了膝关节的三维模型和二维影像之间的配准,计算出两种位置之间的相对位移及角度变化,与位置一相比,位置二的L3后伸5.86°,左侧弯1.85°,右旋2.96°。结论利用2D/3D图像配准技术可实现脊柱在体三维运动检测,但其配准效率及精度尚需进一步研究。
Objective To investigate the feasibility of using two- and three-dimensional （2D/3D） image registration for establishing a testing system of 3D kinematics of the spine in vivo. Methods CT data of the adult human lumbar spine were collected and the two orthogonal images of the same specimen were captured using an X-ray fluoroscope at two different positions. The 3D computer models of L3 and L4 vertebrae were reconstructed. A virtual fluoroscope was then created with solid modeling software to reproduce the relative positions of the orthogonal images. Two virtual cameras in the software were used to represent the X-ray sources. The 3D computer models of the L3 and L4 vertebrae were then introduced into the virtual fluoroscope respectively and projected onto the orthogonal images by the two virtual cameras. By matching the projections of the 3D model to the orthogonal images of L3 and L4 vertebrae, the 3D positions of L3 and L4 were obtained. After calculation, the relative displacement and angle of L3 were determined. Results After 2D/3D image registration, the relative displacement and angle were calculated. Compared with position I, the positional changes of L3 were represented with an extension of 5.86°, left bending of 1.85° and fight rotation of 2.96°. Conclusion 2D/3D image registration allows the simulation of 3D kinematics of the spine in vivo, but the efficiency and accuracy of this technique need further evaluation.
出处
《南方医科大学学报》
CAS
CSCD
北大核心
2006年第12期1694-1697,共4页
Journal of Southern Medical University
基金
国家自然科学基金(30371449
30600302)
广州市科技计划项目(2005Z2-E0111)
广东省医学科研基金(B2006095)~~
