Материал: part02

6.Images sent to Peer AE in Response

7.Close Association

Figure F.4.2-1. Sequencing of Activity - Send Images Requested By an External Peer AE​

The following sequencing constraints illustrated in Figure F.4.2-1 apply to the STORAGE-SCU AE:​

1.​Peer AE requests retrieval of Study, Series, or Images from QUERY-RETRIEVE-SCP AE (C-MOVE-RQ).​

2.​QUERY-RETRIEVE-SCPAEsignalsSTORAGE-SCUAEtosendtheimageCompositeSOPInstancesindicatedintheC-MOVE-​ RQ to the C-MOVE Destination AE.​

3.​STORAGE-SCU AE opens a new Association with the indicated C-MOVE Destination AE.​

4.​STORAGE-SCU AE sends the indicated Composite SOP Instances.​

5.​STORAGE-SCU AE closes the Association.​

6.​The Verification Service is only supported as a utility function for Service staff. It is used only as a diagnostic tool.​

F.4.2.1.3.1.2 Proposed Presentation Contexts​

STORAGE-SCU AE will propose Presentation Contexts as shown in the following table:​

Table F.4.2-6. Proposed Presentation Contexts By the STORAGE-SCU AE​

(Retired)​

US Image Storage​ 1.2.840.10008.5.1.4.1.1.6​ DICOM Explicit VR Little​ 1.2.840.10008.1.2.1​ SCU​ None​

Endian​

(Retired)​

US Image Storage​ 1.2.840.10008.5.1.4.1.1.6​ DICOM Explicit JPEG​ 1.2.840.10008.1.2.4.50​SCU​ None​

baseline lossy compression​

(Retired)​

US Image Storage​ 1.2.840.10008.5.1.4.1.1.6.1​DICOM Implicit VR Little​ 1.2.840.10008.1.2​ SCU​ None​ Endian​

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Note​

The SOP Classes and Transfer Syntaxes that the STORAGE-SCU AE proposes, as listed above, represent the default be-​ havior.TheSTORAGE-SCUAEcanbeconfiguredtoproposeasubsetofthesecontextsoradditionalPresentationContexts.​ Also, the default Behavior is to propose just a single Transfer Syntax per Presentation Context. However, this can be altered​ sothateveryproposedPresentationContexthasauniqueSOPClassandoneormoreTransferSyntaxes.Thatis,thedefault​ behavior is to determine the Transfer Syntaxes the SCP can accept as opposed to which it prefers.​

F.4.2.1.3.1.3 SOP Specific Conformance for Verification SOP Class​

StandardconformanceisprovidedtotheDICOMVerificationServiceClassasanSCU.TheVerificationServiceasanSCUisactually​ only supported as a diagnostic service tool for network communication issues.​

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F.4.2.1.3.1.4 SOP Specific Conformance for Image SOP Classes​

Composite DICOM SOP Instances are maintained as DICOM Part 10 compliant files in the EXAMPLE-QUERY-RETRIEVE-SERVER​ database. The entire set of tags received with the image will be saved in EXAMPLE-QUERY-RETRIEVE-SERVER; this includes all​ Private and SOP Extended Elements. When a SOP Instance is selected for export from EXAMPLE-QUERY-RETRIEVE-SERVER,​ its content will be exported as it was originally received except for a few possible exceptions. Some of the Patient demographic and​ Study information Elements whose values can have been altered due to changes administered on EXAMPLE-QUERY-RETRIEVE-​ SERVER or changes to the state of the image data due to compression can be altered when the SOP Instance is exported.​

The Patient demographic and Study information can be entered or altered by several means: manually, or from HL7 messaging,. The​ replacement behavior depends on which specific DICOM and HL7 services are supported. Also, this behavior is configurable. Values​ can be altered without changing the SOP Instance UID unless otherwise noted. Refer to the Annex for the specific details of which​ Elements can have their values altered at time of export.​

The EXAMPLE-QUERY-RETRIEVE-SERVER creates files called Service Logs that can be used to monitor their status and diagnose​ anyproblemsthatmayarise.IfanyerroroccursduringDICOMcommunicationthenappropriatemessagesarealwaysoutputtothese​ Service Logs. In addition, error messages may be output as alerts to the User Interface in certain cases.​

The STORAGE-SCU AE will exhibit the following Behavior according to the Status Code value returned in a C-STORE Response​ from a destination C-STORE SCP:​

Table F.4.2-7. STORAGE-SCU AE C-STORE Response Status Handling Behavior​

QUERY-RETRIEVE-SCP AE indicating an export failure and the Association is​ released. The QUERY-RETRIEVE-SCP AE will send an appropriate Status in the​ C-MOVE Response.​

Error indication message is output to the Service Logs.​

No message is posted to the User Interface.​

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Error indication message is output to the Service Logs.​

No message is posted to the User Interface.​

AllStatusCodesindicatinganerrororrefusalaretreatedasapermanentfailure.TheSTORAGE-SCUAEneverautomaticallyresends​ imageswhenanerrorStatusCodeisreturnedinaC-STOREResponse.ForspecificbehaviorregardingStatusCodevaluesreturned​ in C-MOVE Responses, refer to the Services Supported as an SCP by the QUERY-RETRIEVE-SCP AE.​

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DICOM PS3.2 2020a - Conformance​ Page 235​

Table F.4.2-8. STORAGE-SCU AE Communication Failure Behavior​

Exception​ Behavior​

No message is posted to the User Interface.​

Timeout expiry for an expected DICOM PDU or​The Association is aborted using a DICOM A-ABORT and a message is sent to the​ TCP/IP packet (Low-level timeout).​ QUERY-RETRIEVE-SCP AE indicating an export failure. The​

QUERY-RETRIEVE-SCP AE will send an appropriate Status in the C-MOVE​ Response.​

Error indication message is output to the Service Logs.​

No message is posted to the User Interface.​

Association A-ABORTed by the SCP or the​ A message is sent to the QUERY-RETRIEVE-SCP AE indicating an export failure.​ networklayersindicatecommunicationloss(i.e.,​The QUERY-RETRIEVE-SCP AE will send an appropriate Status in the C-MOVE​ low-level TCP/IP socket closure)​ Response.​

Error indication message is output to the Service Logs.​

No message is posted to the User Interface.​

F.4.2.1.4 Association Acceptance Policy​

The STORAGE-SCU AE does not accept Associations.​

F.4.2.2 QUERY-RETRIEVE-SCP Application Entity Specification​

F.4.2.2.1 SOP Classes​

The QUERY-RETRIEVE-SCP AE provides Standard Conformance to the following DICOM SOP Classes:​

Table F.4.2-9. SOP Classes for QUERY-RETRIEVE-SCP AE​

F.4.2.2.2 Association Policies​

F.4.2.2.2.1 General​

The QUERY-RETRIEVE-SCP AE will never initiate Associations; it only accepts Association Requests from external DICOM AEs.​ The QUERY-RETRIEVE-SCP AE will accept Associations for Verification, C-FIND, and C-MOVE requests. In the case of a C-MOVE​ request, the QUERY-RETRIEVE-SCP AE will issue a command to the STORAGE-SCU AE to initiate an Association with the Destin-​ ation DICOM AE to send images as specified by the originator of the C-MOVE Request.​

The DICOM standard Application Context Name for DICOM is always accepted:​

- Standard -​