DICOM PS3.7 2019a - Message Exchange

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.


DICOM PS3.7 2019a - Message Exchange