Diagram of an SCU-SCP Set-Up

The diagram given below shows a simple example of an SCU-SCP connection and a series of function calls used to transfer messages and data.

SCU Description SCP
L_DicomCreateNet Creates a DICOM Network handle. L_DicomCreateNet
L_DicomStartUp Initializes the DICOM Network handle. L_DicomStartUp
L_DicomSetCallback Sets the callbacks to be used.
The SCP listens for incoming connection requests.
L_DicomSetCallback
L_DicomListen
L_DicomConnect sendcall.jpg
The SCU calls this function to connect to an SCP. This generates a call to this callback function on the SCP
ACCEPTCALLBACK
CONNECTCALLBACK receivecall.jpg
The SCP calls L_DicomCreateNet and L_DicomSetCallback for each connection it accepts. This provided the SCP memory to store information about this specific connection. L_DicomAccept is called to accept the connection. This generates a call to this callback function on the SCU.
DICOM Network Connection established
L_DicomCreateNet
L_DicomSetCallback
L_DicomAccept
L_DicomSendAssociateRequest sendcall.jpg
The SCU calls this function to request a DICOM Associate connection. This generates calls to these callback functions on the SCP.
RECEIVECALLBACK
RECEIVEASSOCIATEREQUESTCALLBACK
RECEIVECALLBACK
RECEIVEASSOCIATEACCEPTCALLBACK
or
RECEIVECALLBACK
RECEIVEASSOCIATEREJECTCALLBACK
receivecall.jpg
The SCP calls L_DicomSendAssociateAccept to accept the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVEASSOCIATEACCEPTCALLBACK on the SCU. L_DicomSendAssociateReject is sent to reject the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVEASSOCIATEREJECTCALLBACK on the SCU.
DICOM Associate Connection established
L_DicomSendAssociateAccept
or
L_DicomSendAssociateReject
L_DicomSendCStoreRequest The SCU calls this function to request the storage of data. This generates calls to these callback functions on the SCP. RECEIVECALLBACK
RECEIVEDATACALLBACK
RECEIVECSTOREREQUESTCALLBACK
RECEIVECALLBACK
RECEIVEDATACALLBACK
RECEIVECSTORERESPONSECALLBACK
receivecall.jpg
The SCP calls this function to respond to the storage request. This generates calls to these callback functions on the SCU.
L_DicomSendCStoreResponse
L_DicomSendReleaseRequest
or
L_DicomSendAbort
sendcall.jpg
The SCP calls L_DicomSendReleaseRequest to request a release from the DICOM Associate connection. This generates calls to RECEIVECALLBACK and RECEIVERELEASEREQUESTCALLBACK on the SCP. This is the preferred method of closing a connection. L_DicomSendAbort can also be sent to close a connection. This generates calls to RECEIVECALLBACK and RECEIVEABORTCALLBACK on the SCP.
RECEIVECALLBACK
RECEIVERELEASEREQUESTCALLBACK
or
RECEIVECALLBACK
RECEIVEABORTCALLBACK
RECEIVECALLBACK
RECEIVERELEASERESPONSECALLBACK
receivecall.jpg
The SCP calls this function to respond to the release request. This generates calls to the following callback functions on the SCU.
L_DicomSendReleaseResponse
L_DicomClose sendcall.jpg
The SCU calls this function to close the DICOM Associate connection. This generates a call to this callback function on the SCP.
CLOSECALLBACK
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