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	基于CT数据的股骨轴线的获取
	丁辉 ; 刘文博 ; 王广志 ; DING Hui ; LIU Wen-bo ; WANG Guang-zhi
	2010-06-09 ; 2010-06-09
关键词	股骨轴线 股骨机械轴线 股骨解剖轴线 三维股骨模型 CT扫描 femoral axes femoral mechanic axis femoral anatomic axis 3-D femoral model CT scans R318
其他题名	Scheme to extract femur axes automatically based on CT images
中文摘要	目的提出一种利用CT影像数据自动获取股骨轴线的方法,利用该方法可以在计算机上获取精准的股骨三维解剖轴线与机械轴线。方法对人体下肢进行CT扫描,然后对CT图像进行二维阈值分割、三维数据体重建、骨骼分组、数据平滑填充及三维数据体旋转等预处理,获得三维股骨表面模型;通过对股骨头与股骨远端形态特征的分析,根据股骨头近似球形的特点,对判断断层扫描数据梯度变化来计算股骨头中心位置,另外,逐层搜索膝关节断层图像上闭环区域的方法自动求得股骨远端中心的坐标,从而获得股骨长轴。结果建立了一种基于CT图像简便快捷的自动获取股骨头中心与膝关节骨中心三维空间坐标的方法。结论通过此方法可较为精确获得人体下肢的三维股骨机械轴线和股骨解剖轴线。; Objective The identification of lower limb axes plays an important role in the kinematics research and clinical operation of total knee replacement surgery.This paper presents a method to extract the femoral axes based on CT images automatically.Method Using a series of image pre-processing algorithms such as segmentation,smoothing and rotations of the images,to get the 3-D fine mesh of lower limb bones.Then,by analyzing the morphological feature of 3-D femoral surface and based on the definitions of femoral mechanic axis and femoral anatomical axis,three feature points located on femoral head,femoral distal intercondylar notch and femoral shaft centre are selected to define the mechanical and anatomical axes of femur.In the light of the morphological feature of femur head,the center of femoral head was decided according to the changes of the gradient between each cross section of the femoral head.Meanwhile,we got the center of femoral intercondylar notch by calculating the closed-loop zone of cross sections of the bone.Those two points could finally define the mechanical axis of the femur.Result Based on a series of image processing procedures,three dimensional(3-D)surface model of lower limb bone were generated.By analyzing the morphological features of femoral head and knee joint center,a simple and convenient way was proposed to extract the coordinate of three feature points and further the femoral axes automatically.Conclusions Experimental results show that this processing procedure can extract the femoral mechanic axis and femoral anatomical axis precisely with 3-D CT images.; 国家高技术研究计划项目(2006AA02z4e7); 清华-裕元医学研究基金
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/58395]
专题	清华大学
推荐引用方式 GB/T 7714	丁辉,刘文博,王广志,等. 基于CT数据的股骨轴线的获取[J],2010, 2010.
APA	丁辉,刘文博,王广志,DING Hui,LIU Wen-bo,&WANG Guang-zhi.(2010).基于CT数据的股骨轴线的获取..
MLA	丁辉,et al."基于CT数据的股骨轴线的获取".(2010).

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