DICOM PS3.7 2019b - Message Exchange

9.3.2 C-FIND Protocol

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.

9.3.2.1 C-FIND-RQ

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.


Note

Implementations that require compatibility to previous versions of this Standard must set the Command Data Set Type (0000,0800) Field to 0102H (Identifier).

DICOM PS3.7 2019b - Message Exchange