OpenVista(R) is the open-source version of VistA, an enterprise grade health care information system developed by the U.S. Veterans Affairs and deployed at 1,500 global facilities. OpenVista is a registered trademark of Medsphere Systems Corporation
PACS - a system for managing and maintaining Radiology images. RIS - Radiology Information System for automating workflow in a Radiology Department. PACS/RIS - the union of the two.