摘要
基于互信息的医学图像配准算法近来获得了广泛的应用.在计算互信息的时候,采用部分体积插值计算联合直方图无法避免在象素整数倍位移处的局部极值,有可能导致误配准.本文提出了基于B样条函数的部分体积插值方法,有效地减少象素整数倍位移处的局部极值;在优化互信息函数的时候先使用遗传算法将配准参数收敛到最优值附近,然后使用Powell方法进行局部搜索,避免误收敛.实验表明,本文提出的算法具有更好的精确性和稳定性.
The medical image registration method based on mutual information has been widely used recently. Despite of its advantages over other algorithms, it will introduce artifacts in calculating joint histogram with conventional partial volume (PV) interpolation. In this paper,an expand PV interpolation algorithm with B-spline is proposed to reduce the interpolation artifacts. A hybrid search strategy combined genetic algorithm with Powell's method is used to find the optimum value. Experimental results indicate the proposed algorithm can achieve better accuracy and robustness.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2006年第5期962-965,共4页
Acta Electronica Sinica
基金
国家自然科学基金(No.60402024)
教育部新世纪优秀人才计划
关键词
互信息
医学图像配准
B样条
遗传算法
部分体积插值
mutual information
medical image registration
B-spline
genetic algorithm
partial volume interpo-lation