DICOM PS3.7 2019a - Message Exchange

10.3.2 N-GET Protocol (Current)
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### 10.3.2 N-GET Protocol

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

#### 10.3.2.1 N-GET-RQ

The N-GET-RQ Message contains fields as defined in Table 10.3-3. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the N-GET service definition unless otherwise noted in Table 10.3-3. Fields not specified in the N-GET service definition but present in Table 10.3-3 are required by the DIMSE-N protocol.

Table 10.3-3. N-GET-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.
Requested SOP Class UID | (0000,0003) | UI | 1 | SOP Class UID of the SOP Instance for which Attribute Values are to be retrieved.
Command Field | (0000,0100) | US | 1 | This field distinguishes the DIMSE-N operation conveyed by this Message. The value of this field shall be set to 0110H for the N-GET-RQ Message.
Message ID | (0000,0110) | US | 1 | Implementation-specific value that distinguishes this Message from other Messages.
Command Data Set Type | (0000,0800) | US | 1 | This field indicates that no Data Set shall be present in the Message. This field shall be set to the value of 0101H).
Requested SOP Instance UID | (0000,1001) | UI | 1 | Contains the UID of the SOP Instance for which Attribute Values are to be retrieved.
Attribute Identifier List | (0000,1005) | AT | 1-n | This field contains an Attribute Tag for each of the n Attributes applicable to the N-GET operation.

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DICOM PS3.7 2019a - Message Exchange