Multi-modality medical image registration using high dimension mutual information
HU Yong-xiang, Jingtian Tang, Hong Jiang · Computer Engineering and Applications Journal · 2007
Mutual Information(MI) based similarity measure has been widely used in multi-modal medical image registration.One drawback of MI,however,is that it fails to take into account the spatial information of image.In this paper,we propose a novel extension to MI called High-dimension Mutual Information(HMI).This extension takes advantage of neighbor pixels to construct a set of high dimension vector,and then evaluates high dimension entropy using an algorithm based on Nearest Neighbor Search(NNS).In order to compute HMI effectively,we adopt an algorithm called approximate nearest neighbor search.Experiments demonstrate the validation of the extended methods.