关键词: 扩散张量, 配准, 旋转不变测度, 互信息, 重定向

Abstract: As a newly developed non-invasive technique of brain structure analysis，Diffusion Tensor Magnetic Resonance Imaging（DT-MRI） has been playing a more and more significant role in neurological and neurosurgical applications.Accordingly，the requirement for registration of DTI is increasing.In this paper a new method of registration of DT images based on rotation invariants is presented.First，rotation invariants images calculated from source and target DT data are registered using multi-channel mutual information.Second，every tensor is reoriented to assure that tensor orientations of images after registration preserve its physical meaning，that is，diffusion must be oriented in the same direction as fibers.

Key words: diffusion tensor, registration, rotation invariants, mutual information, reorientation