Dicom Claim

[Azalee Rowling]

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The DICOM AEs that claim conformance to this SOP Class as an SCU shall invoke the N-ACTION operation. The DICOM AEs that claim conformance to this SOP Class as an SCP shall support the N-ACTION operation.

If present, the Storage Media File-Set ID (0088,0130) and Storage Media File-Set UID (0088,0140) shall appear either outside the Referenced SOP Sequence (0008,1199), or within one or more Items within that sequence, but not both. If they appear outside of the sequence, then all of the SOP Instances within the sequence shall be retrievable from the specified Storage Media File-Set. If they appear within an Item of that sequence, then the SOP Instance referenced to by that Item shall be retrievable from the specified Storage Media File-Set.

Referenced Performed Procedure Step Sequence (0008,1111) was included in earlier versions, but its use here has been retired. See PS 3.4-2001, in which the Attribute was formerly known as Referenced Study Component Sequence.

This section formerly specified a means of referencing a Study Component that has been completed and semantics that the list of images in the commitment request represented a complete set. This section has been retired since the Modality Performed Procedure Step SOP Classes provide the same facility in a more appropriate service.

The SCU shall use the N-ACTION primitive to request the SCP the safekeeping of a set of SOP Instances. The SOP Instances are referenced in the Action Information as specified in Table J.3-1. The Action Type ID shall be set to 1 specifying the request for storage commitment.

The SCU shall supply the Transaction UID (0008,1195) Attribute to uniquely identify each Storage Commitment Request. The value of the Transaction UID Attribute will be included by the SCP in the Storage Commitment Result (see Section J.3.3.1). Use of the Transaction UID Attribute allows the SCU to match requests and results that may occur over the same or different Associations.

In the usage described here, there is no explicit creation of a SOP Instance upon which an N-ACTION primitive may operate. Instead, the N-ACTION primitive operates upon a constant well-known SOP Instance. This SOP Instance is conceptually created during start up of each Storage Commitment Service Class SCP Application.

Upon receipt of a successful N-ACTION Response Status Code from the SCP, the SCU now knows that the SCP has received the N-ACTION request. Upon receipt of any other N-ACTION Response Status Code from the SCP, the SCU now knows that the SCP will not process the request and therefore will not commit to the storage of the SOP Instances referenced by the Storage Commitment Request. The actions taken by the SCU upon receiving the status is beyond the scope of this Standard. Upon receipt of a failure status, the Transaction UID is no longer active and shall not be reused for other transactions.

In situations where the SOP Instance(s) are transferred via Media Interchange, the Storage Commitment Request may fail because the piece of Media containing the referenced SOP Instance(s) may not yet have been read. Attributes (0088,0130) File-Set ID and (0088,0140) File-Set UID may or may not be present in the case of Media Interchange. They may be provided to facilitate identification of the media containing the transferred SOP Instance(s) by the Storage Commitment SCP.

Upon receipt of the N-ACTION request, the SCP shall return, via the N-ACTION response primitive, the N-ACTION Response Status Code applicable to the associated request. A success status conveys that the SCP has successfully received the request. A failure status conveys that the SCP is not processing the request.

When a Storage Commitment Request is received by an SCP it may immediately assess the list of references for which Storage Commitment is requested and return an N-EVENT-REPORT. In situations where the SOP Instance(s) are transferred via Media Interchange, the N-EVENT-REPORT may fail because the piece of Media containing the referenced SOP Instance(s) may not yet have been read. Attributes (0088,0130) File-Set ID and (0088,0140) File-Set UID may or may not be present in the case of Media Interchange. They may be used to facilitate identification of the media containing the transferred SOP Instance(s) by the Storage Commitment SCP.

The DICOM AEs that claim conformance to this SOP Class as an SCP shall invoke the N-EVENT-REPORT request. The DICOM AEs that claim conformance to this SOP Class as an SCU shall be capable of receiving the N-EVENT-REPORT request.

The Storage Commitment Result notification allows an SCP to inform the SCU whether or not it has accepted storage commitment responsibility for the SOP Instances referenced by a Storage Commitment Request. This notification is also used to convey error information (i.e., storage commitment could not be achieved for one or more of the referenced SOP Instances). This notification shall be invoked through the N-EVENT-REPORT primitive.

If present, the Retrieve AE Title (0008,0054) shall appear either outside the Referenced SOP Sequence (0008,1199), or within one or more Items within that sequence, but not both. If they appear outside of the sequence, then all of the SOP Instances within the sequence shall be retrievable from the specified Retrieve AE Title. If they appear within an Item of that sequence, then the SOP Instance referenced to by that Item shall be retrievable from the specified Retrieve AE Title.

If the SCP determines that it has successfully completed storage commitment for all the SOP Instances referenced by a Storage Commitment Request, the SCP shall issue an N-EVENT-REPORT with the Event Type ID set to 1 (Storage Commitment Request Successful). This event shall include references to the successfully stored SOP Instances. The SCP shall store the referenced SOP Instances in accordance with Storage Level 2 (Full) as defined in the Storage Service Class (i.e., shall store all Attributes, including Private Attributes). The Storage Service Class is defined in PS3.4. After the N-EVENT-REPORT has been sent, the Transaction UID is no longer active and shall not be reused for other transactions.

If it is determined that storage commitment could not be achieved for one or more referenced SOP Instances, the SCP shall issue an N-EVENT-REPORT with the Event Type ID set to 2 (Storage Commitment Request Complete - failure exists) conveying that the SCP does not commit to store all SOP Instances. This event shall include references to the failed SOP Instances together with references to those SOP Instances that have been successfully stored. For each failed SOP Instance the reason for failure shall be described by the Failure Reason Attribute. After the N-EVENT-REPORT has been sent, the Transaction UID is no longer active and shall not be reused for other transactions.

The SCP may attempt to issue the N-EVENT-REPORT on the same Association, but this operation may fail because the SCU is free to release at any time the Association on which it sent the N-ACTION request. As DICOM defaults the association requestor to the SCU role, the SCP (i.e., the association requestor) negotiates an SCP role using the SCU/SCP Role Selection Negotiation (see PS3.7).

When responding on a different Association, the SCP must use the same AE Title as it used on the original Association, because the DICOM Standard defines a Service between two peer applications, each identified by an AE Title. Thus the SCP should be consistently identified for all Associations in the particular instance of the Storage Commitment Service.

The optional Attributes Retrieve AE Title (0008,0054), Storage Media File-Set ID (0088,0130) and Storage Media File-Set UID (0088,0140) within the Event Information allows an SCP to indicate the location where it has stored SOP Instances for safekeeping. For example, the SCP could relay SOP Instances to a third Application Entity using this Service Class, in which case it can use the Retrieve AE Title Attribute to indicate the real location of the data. Another example is if the SCP stores data on media, it can indicate this using the Storage Media File-Set ID and UID Attributes.

The SCU shall return, via the N-EVENT-REPORT response primitive, the N-EVENT-REPORT Response Status Code applicable to the associated request. The actions taken by the SCU upon receiving the N-EVENT-REPORT are beyond the scope of this Standard but are stated in its Conformance Statement.

In the case where the SCP indicates that it cannot achieve storage commitment for some SOP Instances, the SCU might, for example, re-send the failed SOP Instances to the SCP (via the Storage Service Class) and then re-transmit the N-ACTION request. However, this behavior is beyond the scope of this Standard.

This Section refers to Status Codes returned by the N-EVENT-REPORT response primitive. The Failure Reason Attribute returned in the Storage Commitment Result - Event Information (see PS3.3) are described in the Storage Commitment IOD.

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