Picture archiving and communication system (PACS) is a collection of technologies used to carry out digital medical
imaging. PACS is used to digitally acquire medical images from the various modalities, such as computed tomography
(CT), magnetic resonance imaging (MRI), ultrasound, and digital projection radiography.The image data and pertinent
information are transmitted to other and possibly remote locations over networks, where they may be displayed
on computer workstations for soft copy viewing in multiple locations, thus permitting simultaneous consultations
and almost instant reporting from radiologists at a distance. Data are secured and archived on digital media
such as optical disks or tape, and may be automatically retrieved as necessary. Close integration with the hospital
information system (HIS) – radiology information system (RIS) is critical for system functionality. Medical image
management systems are maturing, providing access outside of the radiology department to images throughout the
hospital via the Ethernet, at different hospitals, or from a home workstation if teleradiology has been implemented.