FusionSync is a software program that provides a registration engine to align (register) pairs ofimages from same and different imaging modalities. The platform-independent registration engine isdesigned as a plug-in component that has the ability to extend the productivity of existing viewerslike CAD workstations or PACS. The graphical user interface of FusionSync is designed as a plug-incomponent for aycan workstation OsiriX PRO. It includes functionality to display the originalvolumetric data and the results of the registration operation. The graphical user interface allows tocontrol the registration engine and fusion visualization.