DICOM PS3.17 2018d - Explanatory Information

MM.4 Consistency (Current)
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## MM.4 Consistency

There is no requirement in the Frame Level Retrieve Service for the SCP to cache or otherwise retain any of the information it uses to create the new SOP Instance, and therefore, an SCU submitting multiple requests for the same information cannot expect to receive the "same" object with the same Instance and Series UIDs each time. However, an SCP may choose to cache such instances, and if returning an instance identical to one previously created, then the same Instance and Series UIDs may be used. The newly created object is however guaranteed to be a valid SOP instance and an SCU may therefore choose to send such an instance to an SCP using C-STORE, in which case it should be handled exactly as any other Composite Instance of that SOP class.

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DICOM PS3.17 2018d - Explanatory Information