下颌骨CT序列图象的三维重建  

3D Reconstruction Based on CT Images of Mandible

作　　者：杨文[1] 柳俊波 廖明生[3] 杨杰[3] 

机构地区：[1]武汉大学电子信息学院,武汉430079 [2]深圳安科高技术股份有限公司,深圳518057 [3]武汉大学测绘遥感信息工程国家重点实验室,武汉430079

出　　处：《中国图象图形学报（A辑）》2002年第9期911-917,共7页Journal of Image and Graphics

摘　　要：在对医学图象三维重建的研究现状和已有的重建方法进行分析的基础上 ,从牙科医生进行牙种植手术的实际情况出发 ,提出了一种简单、实用的三维图象重建算法——影像配准叠加法 .该方法的基本思路是 :首先对二维 CT数字图象进行影像纠正、内插和配准 ,以确定每个像素的三维坐标值 ,再按其空间位置关系给每个像素点设置适当的透明度 ,然后进行影像配准叠加 ,以便在二维屏幕上显示出具有立体感的真三维图象来 .实验结果表明 ,该方法定位精度高 ,重建图象失真度小 ,既能作定性观察 ,又能作定量测量 ,并且测量数据精度较高 .A new approach, image registration and superposition of 3D reconstruction based on CT images is proposed in this paper. Compared with the traditional approaches, it is simpler and more effective. It can be realized in three steps. Firstly, correcting the distortion of all the 2D CT images, some images between every two serial CT slices should be interpolated if needed. Secondly, every pixel will be endowed with information of depth and transparence according to its spatial coordinates and gray level. Finally, a 3D image will be displayed on the screen. The reconstruction image includes not only information of the surface of the object, but also the inner of the object. The results of experiments indicate that the 3D image reconstructed has only a little distortion and the results of measure by software are very accurate. The experiment was carried out successfully with 33 pieces of serials image of mandible, a accurate 3D image of mandible was acquired. Compared the results measured by software in our reproduction model with those measured by micrometer in true model, the standard deviation of absolute error is only 0 151mm. At the same time, this registration method can be applied to many other cases for 3D image reconstruction for serial sections.

关 键 词：下颌骨 三维重建 影像叠加 CT图象 计算机断层摄影术 医学图象 牙种植手术 

分 类 号：R816.8[医药卫生—放射医学] TP391.41[医药卫生—临床医学]