image-guided surgery, medical imaging and informatics products and medical products; computer software for image- guided surgery, medical imaging and informatics; integrated treatment planning and delivery systems; and optical tracking systems; computer hardware and software for medical, surgical and radiology purposes; image production software; image management, review and diagnosis software; computer hardware, software, workstations; computer workstations for medical, surgical and radiology imaging; software to facilitate the development of medical imaging, surgical and radiology applications; computer system used to assist surgeons consisting of computer hardware and software and a three-dimensional work station with image data; computer graphics workstations comprising special purpose computer graphics display hardware, operating software and special purpose application software dedicated to the examination and analysis of medical imaging data which has been acquired from other imaging devices