| DICOM PS3.7 2024c - Message Exchange |
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This section specifies the protocol necessary to perform the set of DIMSE-N operations and notifications. The Value Representations (VR) specified in the following tables shall be encoded as defined in PS3.5.
The information necessary for the N-EVENT-REPORT request and indication DIMSE-N primitives are conveyed in the N-EVENT-REPORT-RQ Message. The information necessary for the N-EVENT-REPORT response and confirmation DIMSE-N primitives are conveyed in the N-EVENT-REPORT-RSP Message.
The N-EVENT-REPORT-RQ Message contains fields as defined in Table 10.3-1. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the N-EVENT-REPORT service definition unless otherwise noted in Table 10.3-1. Fields not specified in the N-EVENT-REPORT service definition but present in Table 10.3-1 are required by the DIMSE-N protocol.
Table 10.3-1. N-EVENT-REPORT-RQ Message Fields
The N-EVENT-REPORT-RSP Message contains fields as defined in Table 10.3-2 and Annex C. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the N-EVENT-REPORT service definition unless otherwise noted in Table 10.3-2. Fields not specified in the N-EVENT-REPORT service definition but present in Table 10.3-2 are required by the DIMSE-N protocol.
Table 10.3-2. N-EVENT-REPORT-RSP Message Fields
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The even number of bytes from the end of the value field to the beginning of the next group. |
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SOP Class UID of the SOP Instance for which this event occurred. |
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This field distinguishes the DIMSE-N operation conveyed by this Message. The value of this field shall be set to 8100H for the N-EVENT-REPORT-RSP Message. |
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Shall be set to the value of the Message ID (0000,0110) field used in associated N-EVENT-REPORT-RQ Message. |
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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. |
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The value of this field depends upon the status type. Annex C defines the encoding of the status types defined in the service definition. |
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Contains the UID of the SOP Instance for which this event occurred. |
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Application-specific Data Set containing additional information related to the operation. |
The N-EVENT-REPORT reporting procedures are initiated by the invoking DIMSE Service User issuing an N-EVENT-REPORT request primitive. On receipt of the N-EVENT-REPORT request primitive the DIMSE-N protocol machine shall:
On receipt of a Message conveying an N-EVENT-REPORT-RQ the DIMSE-N protocol machine shall issue an N-EVENT-REPORT indication primitive to the performing DIMSE Service User.
On receipt of the N-EVENT-REPORT response primitive issued by the performing DIMSE Service User , the DIMSE-N protocol machine shall:
send the Message using the P-DATA request service (see Section 8.1)
On receipt of a Message conveying an N-EVENT-REPORT-RSP the DIMSE-N protocol machine shall issue an N-EVENT-REPORT confirmation primitive to the invoking DIMSE Service User, thus completing the notification procedure.
The performing DIMSE Service User may return an N-EVENT-REPORT-RSP with the status of Failed or Refused before the complete N-EVENT-REPORT-RQ request Message has been completely transmitted by the invoking DIMSE Service User (this is called an early failed response). Upon receipt of this Failed or Refused N-EVENT-REPORT-RSP the invoking DIMSE Service User may terminate the Message before it is completely sent (i.e., set the Last Fragment bit to 1 in a Data PDV for this Message, see Annex F). Following this, it may invoke another operation or notification. It is a protocol violation for an invoking DIMSE Service User to set the Last Fragment bit to 1 before an N-EVENT-REPORT-RQ Message has been completely transmitted if it has not received a Failed or Refused N-EVENT-REPORT-RSP to that request.
When an Association is operating in asynchronous mode, it is possible for an invoking DIMSE Service User to transmit several Messages before a response. Therefore, while sending a Message it may receive a response to a previously transmitted Message. In this case this response is not an early failed response because the related Message has already been sent.
| DICOM PS3.7 2024c - Message Exchange |
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