4 Terms and Definitions
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# 4 Terms and Definitions

For the purposes of this part of DICOM, the following terms and definitions apply.

## 4.1 DICOM Persistent Object

An instance of a data object as defined by PS3.3 that has been allocated an unique identifier in the format specified for SOP Instance UID in PS3.3 and has been chosen as an object to be saved securely for some period of time. Within the DICOM Standard, a DICOM Persistent Object is referred to as a Composite Service Object Pair (SOP) Instance.

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3 Normative References | Home | 4.2 Origin-Server