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

 

SCP

 

 

 

L_DicomCreateNet

Create a DICOM Network handle.

L_DicomCreateNet

L_DicomStartUp

Initialize the DICOM Network handle.

L_DicomStartUp

L_DicomSetCallback

Set the callbacks to be used.

L_DicomSetCallback

 

The SCP listens for incoming connection requests.

L_DicomListen

L_DicomConnect

The SCU calls this function to connect to an SCP. This generates a call to this callback function on the SCP

ACCEPTCALLBACK

CONNECTCALLBACK

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.

L_DicomCreateNet
L_DicomSetCallback

L_DicomAccept

 

DICOM Network Connection established

 

L_DicomSendAssociateRequest

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

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.

L_DicomSendAssociateAccept
or
L_DicomSendAssociateReject

 

DICOM Associate Connection established

 

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

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

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

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

The SCU calls this function to close the DICOM Associate connection. This generates a call to this callback function on the SCP.

CLOSECALLBACK

Help Version 19.0.2017.10.18
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