The information necessary for the C-FIND request and indication DIMSE-C primitives are conveyed in the C-FIND-RQ Message. The information necessary for the C-FIND response and confirmation DIMSE-C primitives are conveyed in the C-FIND-RSP Message. The information necessary for the C-FIND Cancel Request and Cancel Indication primitives are conveyed in the C-CANCEL-FIND-RQ Message.
The C-FIND-RQ Message contains fields as defined in Table 9.3-3. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the C-FIND service definition unless otherwise noted in Table 9.3-3. Fields not specified in the C-FIND service definition but present in Table 9.3-3 are required by the DIMSE-C protocol.
Table 9.3-3. C-FIND-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. |
|
Affected SOP Class UID |
(0000,0002) |
UI |
1 |
SOP Class UID associated with this operation. |
|
Command Field |
(0000,0100) |
US |
1 |
This field distinguishes the DIMSE‑C operation conveyed by this Message. The value of this field shall be set to 0020H for the C-FIND-RQ Message. |
|
Message ID |
(0000,0110) |
US |
1 |
Implementation-specific value that distinguishes this Message from other Messages. |
|
Priority |
(0000,0700) |
US |
1 |
The priority shall be set to one of the following values: LOW = 0002H MEDIUM = 0000H HIGH = 0001H |
|
Command Data Set Type |
(0000,0800) |
US |
1 |
This field indicates that a Data Set is present in the Message. It shall be set to any value other than 0101H (Null). |
|
Identifier |
(no tag) |
- |
- |
A Data Set that encodes the Identifier to be matched. See Section 9.1.2.1.5. |
Implementations that require compatibility to previous versions of this Standard must set the Command Data Set Type (0000,0800) Field to 0102H (Identifier).