It also has a pen tool for freehand drawing thus making it very resourceful and one you will ensure you never look back. It has fluid panning and zooming functionalities as well as brightness and contrast control. This is a PACS-DICOM viewer that designed to give you a unique experience in medical imaging. However, with time, we have seen a considerable amount of development in the field and more so radiology though human intervention is always the first line of defense. It is the result of more than 15 years of research and development in digital imaging. OsiriX DICOM Viewer With high performance and an intuitive interactive user interface, OsiriX is the most widely used DICOM viewer in the world.