Medical image registration plays a significant role in clinical diagnosis and treatment,illness monitoring,radiotherapy,surgical navigation and so on.Medical image registration algorithms are classified into rigid registration and non-rigid registration.At present,the rigid registration algorithms have been developed and are used well in actual clinical application.However,the non-rigid medical image registration algorithms are still in developing stage.Based on the summarization of the medical image registration framework and each module of the framework,an overview of non-rigid medical image registration algorithms is presented in this paper,which includes algorithm theory,main characteristics,applicable condition and the improvement direction,etc.Finally,the trend of non-rigid registration algorithms in future is prospected.
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