9.3.1 C-STORE PROTOCOL

The information necessary for the C-STORE request and indication DIMSE-C primitives are conveyed in the C-STORE-RQ Message. The information necessary for the C-STORE response and confirmation DIMSE-C primitives are conveyed in the C-STORE-RSP Message.

9.3.1.1 C-STORE-RQ

The C-STORE-RQ Message contains fields as defined in Table 9.3-1. Each field shall conform to DICOM encoding and Value Representation as defined in PS 3.5. Fields are required as specified in the C-STORE service definition unless otherwise noted in Table 9.3-1. Fields not specified in the C-STORE service definition but present in Table 9.3-1 are required by the DIMSE-C protocol.

Table 9.3-1 C-STORE-RQ MESSAGE FIELDS

Message Field Tag VR VM Description of Field
Command Group Length (0000,0000) UL 1 The even number of bytes from the end of the value field to the beginning of the next group.
Affected SOP Class UID (0000,0002) UI 1 SOP Class UID of the SOP Instance to be stored.
Command Field (0000,0100) US 1 This field distinguishes the DIMSE-C operation conveyed by this Message. The value of this field shall be set to 0001H for the C-STORE-RQ Message.
Message ID (0000,0110) US 1 Implementation-specific value. It distinguishes this Message from other Messages.
Priority (0000,0700) US 1 The priority shall be set to one of the following values: LOW = 0002H MEDIUM = 0000H HIGH = 0001H
Command Data Set Type (0000,0800) US 1 This field indicates that a Data Set is present in the Message. It shall be set to any value other than 0101H (Null).
Affected SOP Instance UID (0000,1000) UI 1 Contains the UID of the SOP Instance to be stored.
Move Originator Application Entity Title (0000,1030) AE 1 Contains the DICOM AE Title of the DICOM AE which invoked the C-MOVE operation from which this C-STORE sub-operation is being performed.
Move Originator Message ID (0000,1031) US 1 Contains the Message ID (0000,0110) of the C-MOVE-RQ Message from which this C-STORE sub-operations is being performed.
Data Set (no tag) Application-specific Data Set.

Note: The contents of Composite Information Object Definitions, encoded as a series of Data Elements, are defined in PS 3.3 and PS 3.4

9.3.1.2 C-STORE-RSP

The C-STORE-RSP Message contains fields as defined in Table 9.3-2 and in Annex C. Each field shall conform to DICOM encoding and Value Representation as defined in PS 3.5 of the DICOM Standard. Fields are required as specified in the C-STORE service definition unless otherwise noted in Table 9.3-2. Fields not specified in the C-STORE service definition but present in Table 9.3-2 are required by the DIMSE-C protocol.

Table 9.3-2 C-STORE-RSP MESSAGE FIELDS

Message Field Tag VR VM Description of Field
Command Group Length (0000,0000) UL 1 The even number of bytes from the end of the value field to the beginning of the next group.
Affected SOP Class UID (0000,0002) UI 1 Contains the SOP Class of the SOP Instance stored.
Command Field (0000,0100) US 1 This field distinguishes the DIMSE-C operation conveyed by this Message. The value of this field shall be set to 8001H for the C-STORE-RSP Message.
Message ID Being Responded To (0000,0120) US 1 Shall be set to the value of the Message ID (0000,0110) field used in associated C-STORE-RQ Message.
Command Data Set Type (0000,0800) US 1 This field indicates that no Data Set is present in the Message and shall be set to a value of 0101H (Null).
Status (0000,0900) US 1 The value of this field depends upon the status type. Annex C defines the encoding of the status types defined in the service definition.
Affected SOP Instance UID (0000,1000) UI 1 Contains the UID of the SOP Instance stored.

9.3.1.3 C-STORE protocol procedures

The C-STORE procedures are initiated by the invoking DIMSE-service-user issuing a C-STORE request primitive. On receipt of the C-STORE request primitive the DIMSE-C protocol machine shall:

⎯ construct a Message conveying the C-STORE-RQ

  1. send the Message using the P-DATA request service (See 8.1)

On receipt of a Message conveying a C-STORE-RQ the DIMSE-C protocol machine shall issue a C-STORE indication primitive to the performing DIMSE-service-user.

On receipt of the C-STORE response primitive, issued by the performing DIMSE-service-user, the DIMSE-C protocol machine shall:

⎯ construct a Message conveying the C-STORE-RSP

⎯ send the Message using the P-DATA request service (See 8.1)

On receipt of a Message conveying a C-STORE-RSP the DIMSE-C protocol machine shall issue a C-STORE confirmation primitive to the invoking DIMSE-service-user, thus completing the C-STORE procedure.

The performing DIMSE-service-user may return a C-STORE-RSP with the status of Failed or Refused before the complete C-STORE-RQ request Message has been completely transmitted by the invoking DIMSE-service-user (this is called an early failed response). Upon receipt of this Failed or Refused C-STORE-RSP the invoking DIMSE-service-user may terminate the Message before it is completely sent (i.e. set the Last Fragment bit to 1 in a Data PDV for this Message, see Annex F). Following this, it may invoke another operation or notification. It is a protocol violation for an invoking DIMSE-service-user to set the Last Fragment bit to 1 before a C-STORE-RQ Message has been completely transmitted if it has not received a Failed or Refused C-STORE-RSP to that request.

Note: When an Association is operating in asynchronous mode, it is possible for an invoking DIMSE-service-user to transmit several Messages before a response. Therefore, while sending a Message it may receive a response to a previously transmitted Message. In this case this response is not an early failed response because the related Message has already been sent.