R.3 Instance Availability Notification SOP Class
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## R.3 Instance Availability Notification SOP Class

### R.3.1 DIMSE Service Group

The DIMSE Services shown in Table R.3.1-1 are applicable to the Instance Availability Notification IOD under the Instance Availability Notification SOP Class.

Table R.3.1-1. DIMSE Service Group

DIMSE Service Element | Usage SCU/SCP
--- | ---
N-CREATE | M/M

The DIMSE Services and Protocols are specified in PS3.7.

### Note

Though the terminology "notification" is used for this Service Class, the notification is in fact performed through Operations rather than Notifications.

### R.3.2 Operations

The Application Entity that claims conformance to this SOP Class as an SCU shall be permitted to invoke the following operations and the Application Entity that claims conformance as an SCP shall be capable of providing the following operations.

#### R.3.2.1 N-CREATE Instance Availability Notification SOP Instance

This operation allows an SCU to create an instance of the Instance Availability Notification SOP Class and to provide availability information about Instances that are under the control of the SCU. This operation shall be invoked through the DIMSE N-CREATE Service.

##### R.3.2.1.1 Attributes

The Attribute list of the N-CREATE is defined as shown in Table R.3.2-1.

Table R.3.2-1. Instance Availability Notification SOP Class N-CREATE Attributes

Attribute Name | Tag | Req. Type N-CREATE (SCU/SCP)
--- | --- | ---
Specific Character Set | (0008,0005) | 1C/1C (Required if an extended or replacement character set is used)
All other Attributes of SOP Common Module | 3/3
Referenced Performed Procedure Step Sequence | (0008,1111) | 2/2
>Referenced SOP Class UID | (0008,1150) | 1/1
>Referenced SOP Instance UID | (0008,1155) | 1/1
>Performed Workitem Code Sequence | (0040,4019) | 2/2
>>Code Value | (0008,0100) | 1/1
>>Coding Scheme Designator | (0008,0102) | 1/1
>>Code Meaning | (0008,0104) | 1/1
>>All other Attributes from Performed Workitem Code Sequence | 3/3
Study Instance UID | (0020,000D) | 1/1
Referenced Series Sequence | (0008,1115) | 1/1
>Series Instance UID | (0020,000E) | 1/1
>Referenced SOP Sequence | (0008,1199) | 1/1
>>Referenced SOP Class UID | (0008,1150) | 1/1
>>Reference SOP Instance UID | (0008,1155) | 1/1
>>Instance Availability | (0008,0056) | 1/1
>>Retrieve AE Title | (0008,0054) | 1/1
>>Retrieve Location UID | (0040,E011) | 3/3
>>Retrieve URI | (0040,E010) | 3/3
>>Storage Media File-Set ID | (0088,0130) | 3/3
>>Storage Media File-Set UID | (0088,0140) | 3/3

##### R.3.2.1.2 Service Class User

The SCU shall specify in the N-CREATE request primitive the SOP Class and SOP Instance UIDs of the Instance Availability Notification SOP Instance that is created and for which Attribute Values are to be provided.

The SCU shall provide Attribute values for the Instance Availability Notification SOP Class Attributes as specified in Table R.3.2-1.

The use of additional optional Attributes by the SCU is forbidden.

### Note

The reason for forbidding optional Attributes is to prevent the use of Standard Extended SOP Classes that might add contextual information such as patient and procedure identifiers.

The encoding rules for Instance Availability Notification Attributes are specified in the N-CREATE request primitive specification in PS3.7.

There are no requirements on when N-CREATE requests are required to be performed.

In particular, there are no requirements that notification about the availability of the first instance of a Performed Procedure Step or Study be provided upon its reception, nor that availability notification be provided when an entire set of instances comprising a completed Performed Procedure Step or Study are available, though these are typical and common scenarios.

##### R.3.2.1.3 Service Class Provider

The SCP shall return, via the N-CREATE response primitive, the N-CREATE Response Status Code applicable to the associated request.

##### R.3.2.1.4 Status Codes

There are no specific status codes. See PS3.7 for response status codes.

### R.3.3 Instance Availability Notification SOP Class UID

The Instance Availability Notification SOP Class shall be uniquely identified by the Instance Availability Notification SOP Class UID, which shall have the value "1.2.840.10008.5.1.4.33".

### R.3.4 Conformance Requirements

Implementations shall include within their Conformance Statement information as described below.

An implementation may conform to this SOP Class as an SCU or as an SCP. The Conformance Statement shall be in the format defined in Annex A “DICOM Conformance Statement Template (Normative)”.

#### R.3.4.1 SCU Conformance

An implementation that is conformant to this SOP Class as an SCU shall meet conformance requirements for the operations that it invokes.

##### R.3.4.1.1 Operations

Any Attributes for which Attribute Values may be provided (using the N-CREATE) by the SCU shall be enumerated in the SCU Conformance Statement. The SCU Conformance Statement shall be formatted as defined in Annex A “DICOM Conformance Statement Template (Normative)”.

An implementation that conforms to this SOP Class as an SCU shall specify under which conditions during the performance of real-world activities it will create the SOP Class Instance.

The SCU Conformance Statement shall specify what is meant by each reported value of Instance Availability (0008,0056).

The SCU Conformance Statement shall describe the relationship between the Instance Availability Notification and the Performed Procedure Step SOP Classes, if the latter are supported.

#### R.3.4.2 SCP Conformance

An implementation that is conformant to this SOP Class as an SCP shall meet conformance requirements for the operations that it performs.

##### R.3.4.2.1 Operations

The SCP Conformance Statement shall be formatted as defined in Annex A “DICOM Conformance Statement Template (Normative)”.

The SCP Conformance Statement shall provide information on the behavior of the SCP (in terms of real world activities) for each reported value of Instance Availability (0008,0056).

The SCP Conformance Statement shall describe the behavioral relationship between the Instance Availability Notification and the Performed Procedure Step SOP Classes, if the latter are supported.

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