一种改进的基于互信息的三维医学图像配准算法

A modified MI measure on 3D medical image registration

基于互信息的三维医学图像配准是配准的一大热点.本文提出的配准方法主要是对互信息测度的公式进行简化,修正了Powell算法的方向替换方法,保持了原搜索方向,提高了配准速度.合理的设置收敛阈值,并用多分辨率策略进行了图像配准测试.实验表明,改进后的互信息测度可以达到亚像素精度,而且在配准速度上有了明显提高.

Medical image registration based on Mutual Information（MI） is a hot topic in registration research. The MI＇s formula is modified to reduce computing cost, and the replace of Powell＇s, search direction is also rectified to reserve the original direction, Multi-resolution method is used in our registration test. The results show that the modified MI measure can reach sub-voxel precision, and the registration time is reduced remarkably.