影像纠正在下颌骨CT切片三维重建中的应用

Application of Image Correction in 3D Reconstruction of Mandible from CT Slices

将切片图像准确地对齐 ,是连续切片三维重建的重要步骤 ,它直接影响着重建结果和参数计算的准确性 ,目前这个问题还没有很好的解决方法。本文以下颌骨 CT切片图像三维重建为例 ,在硬定位的基础上提出了基于仿射变换和广义霍夫变换的软定位方法 ,利用控制点 ,来进行定位处理 ,取得了较好的效果。实验结果表明 ,该方法定位精度高 。

Precision registration of serial sections is an important step for 3-D image reconstruction. It directly affects the accuracy of the reconstructed result and parameter computation. This problem has been studied and demonstrated by many investigators, but the whole process has not yet reached good performance. In this paper, we discussed the registration of serial sections image of mandible and put forward a method of the soft registration-based transformation on the basis of the hard registration in consideration of the speciality of 3-D image reconstruction for the serial sections of mandible. Employing control points and using Affine Transformation and Extended Hough Transformation, we solved the problem of displacement on 3-D image reconstruction for serial secons and paved the way for reconstructing the mandible microstructure with reality. The results of experiments indicate that the 3D image reconstructed after registration has only a little distortion.