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U

Uninterruptible Power Supply (UPS) A device which provides back-up power in the event of failure in the primary power supply system. If there is a power-cut or drop-out the UPS will keep the system running for a finite period of time, allowing the primary power supply to be repaired and/or the system to be powered-off gracefully. This protects the equipment and the stored data.

UNIX A multi-user operating system that runs on a server or workstation. It is used to control both network and file handling resources. See Operating System (OS).

Unshielded Twisted Pair (UTP) Cable that consists of two unshielded wires twisted around each other and is used extensively in LANs due to its low cost. See Shielded Twisted Pair (STP).

Unverified report This is a clinical report that the radiologist has dictated about an examination but awaits verification after typing by secretarial staff. This is a final check to eliminate human errors. See Clinical report and Verified report

UPS See Uninterruptible Power Supply.

UTP See Unshielded Twisted Pair.