The information necessary for the N-ACTION request and indication DIMSE-N primitives are conveyed in the N-ACTION-RQ Message. The information necessary for the N-ACTION response and confirmation DIMSE-N primitives are conveyed in the N-ACTION-RSP Message.
The N-ACTION-RQ Message contains fields as defined in Table 10.3-7. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the N-ACTION service definition unless otherwise noted in Table 10.3-7. Fields not specified in the N-ACTION service definition but present in Table 10.3-7 are required by the DIMSE-N protocol.
Table 10.3-7. N-ACTION-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 the action is to be performed. |
|
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 0130H for the N-ACTION-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 if a Data Set is present in the Message. This field shall be set to the value of 0101H if no Data Set is present; any other value indicates a Data Set is included in the Message. |
|
Requested SOP Instance UID |
(0000,1001) |
UI |
1 |
Contains the UID of the SOP Instance for which the action is to be performed. |
|
Action Type ID |
(0000,1008) |
US |
1 |
Values for this field are application-specific. |
|
Action Information |
(no tag) |
- |
- |
Application-specific Data Set containing additional information related to the operation. |