![]() ![]() The DICOM standard clearly requires these instance numbers be unique. How does one ensure that a particular manufacturer does not issue the same numbers for instances created from two of its own CT scanners? Actually, there is no absolute guarantee that this will not happen. They typically take their organization number as a "root" and add a device specific identifier such as the MAC address (if they have one) and append it with a data-time stamps and potentially some other numbers to make it unique. SOP Class and SOP Instance, uniquely identify all DICOM objects such as images, reports, presentation states, etc. Each vendor is required to register an organization root number from a central registration agency such as ANSI in the US, allowing each manufacturer to create their unique numbers.Ĭreators of object instances, such as a CT or MR acquisition unit, generate world-wide unique instance numbers for each individual object. ![]() They are registered by a standards organization to prevent duplication. ![]() Unique Identifiers ( UIDs) are used to identify everything in DICOM, from the SOP classes to the individual objects. a specific CT image) is the instance of the Class, e.g. Keywords: SOP Instance UID, SOP Instance, Unique Identifier, UID, ANSI, Object InstanceĪn SOP Class is defined as a combination of one or more DICOM Service Elements, which are commands, and an Object, which is defined by an Information Object Definition (IOD). ![]()
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