Storage SCU
Storage Service Class User
A Storage SCU is the role a device plays when it initiates a C-STORE request to send DICOM images to a Storage SCP — the role a CT or MR console performs when it pushes a finished study to a PACS.
What Storage SCU means in practice
SCU is the requesting half of a DICOM service and SCP the providing half, so every transfer has one of each. The SCU chooses the destination, proposes the transfer syntaxes and drives the transfer; the SCP accepts or rejects what is offered. The same physical device is frequently an SCU for one operation and an SCP for another.
Source
This definition follows NEMA PS3.4 Annex B — Storage Service Class; roles in PS3.7, published by NEMA as part of the DICOM standard.
Related terms
Storage SCP
A Storage SCP is the role a device plays when it accepts incoming DICOM images, listening for C-STORE requests and storing what it receives — the role a PACS or an archiving viewer performs.
C-STORE
C-STORE is the DICOM network service used to transfer a composite object — an image or similar instance — from one device to another, and it is the operation behind "sending a study" to a PACS.
AE Title
An AE Title is the name a DICOM device identifies itself by on the network, used together with its IP address and port to address it when another device opens an association.