Материал: part17

AsystemthatlaterN-CREATEsaMPPSSOPInstancemayusetheseAttributevaluesextractedfromtherelatedImageSOPInstances.​ •​Copy the following Attribute values, if available to the Modality, into the Image SOP Instances:​

•​Accession Number​ •​Patient ID​ •​Patient's Name​ •​Patient's Birth Date​ •​Patient's Sex​

If sufficient identifying information is be included, it will allow the Image SOP Instances to be later related to the Requested Procedure​ and the actual or conceptual Detached Study Management entity.​

•​Include the following Attribute values that may be generated during image acquisition, if supported, into the Image SOP Instances:​ •​Performed Procedure Step Start Date​

•​Performed Procedure Step Start Time​ •​Performed Procedure Step Description​ •​Study ID​

AsystemthatlaterN-CREATEsaMPPSSOPInstancemayusetheseAttributevaluesextractedfromtherelatedImageSOPInstances.​

J.4 One MPPS Is Created in Response to Two Or More Requested Procedures​

In the MPPS SOP Instance, all the specific Attributes of a Scheduled Procedure Step or Steps are included in the Scheduled Step​ Attributes Sequence. In the Image SOP Instances, these Attributes may be included in the Request Attributes Sequence. This is an​ optional Sequence in order not to change the definition of existing SOP Classes by adding new required Attributes or changing the​ meaning of existing Attributes.​

Both Sequences may have more than one Item if more than one Requested Procedure results in a single Performed Procedure Step.​

Because of the definitions of existing Attributes in existing Image SOP Classes, the following solutions are a compromise. The first​ onechoosesorcreatesavalueforthesinglevaluedAttributesStudyInstanceUIDandAccessionNumber.Thesecondonecompletely​ replicates the Image data with different values for the Attributes Study Instance UID and Accession Number.​

J.4.1 Choose Or Create A Value For Study Instance UID and Accession Number​

The modality may:​

•​In the Image SOP Instances:​

•​create a Request Attributes Sequence containing two or more Items each containing the following Attributes:​

•​Requested Procedure ID​

•​Scheduled Procedure Step ID​

•​Scheduled Procedure Step Description​

•​Scheduled Protocol Code Sequence​

•​create a Referenced Study Sequence containing two or more Items sufficient to contain the Study SOP Instance UID values from​ the Modality Worklist for both Requested Procedures​

•​select one value from the Modality Worklist or generate a new value for:​

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•​Study Instance UID​

•​select one value from the Modality Worklist or generate a new value or assign an empty value for:​

•​Accession Number​

•​In the MPPS SOP Instance:​

•​create a Scheduled Step Attributes Sequence containing two or more Items each containing the following Attributes:​

•​Study Instance UID​

•​Referenced Study Sequence​

•​Accession Number​

•​Requested Procedure ID​

•​Scheduled Procedure Step ID​

•​Scheduled Procedure Step Description​

•​Scheduled Protocol Code Sequence​

•​include the following Attribute value that may be generated during image acquisition, if supported:​

•​Procedure Code Sequence​

•​In both the Image SOP Instances and the MPPS SOP Instance​

•​create a Performed Procedure Step ID​

•​include the following Attribute values that may be generated during image acquisition, if supported:​

•​Performed Procedure Step Start Date​

•​Performed Procedure Step Start Time​

•​Performed Procedure Step Description​

•​Study ID​

J.4.2 Replicate The Image IOD​

An alternative method is to replicate the entire Image SOP Instance with a new SOP Instance UID, and assign each Image IOD it's​ own identifying Attributes. In this case, each of the Study Instance UID and the Accession Number values can be used in their own​ Image SOP Instance.​

BothImageSOPInstancesmayreferenceasingleMPPSSOPInstance(viatheMPPSSOPInstanceUIDintheReferencedPerformed​

Procedure Step Sequence).​

Each individual Image SOP Instance may reference it's own related Study SOP Instance, if it exists (via the Referenced Study Se-​ quence). This Study SOP Instance has a one to one relationship with the corresponding Requested Procedure.​

If an MPPS SOP Instance is created, it may reference both related Study SOP Instances.​

The modality may:​

•​For all Series in the MPPS, replicate the entire Series of Images using new Series Instance UIDs​

•​Create replicated Image SOP Instances with different SOP Instance UIDs that use the new Series Instance UIDs, for each of the​ two or more Requested Procedures​

•​In each of the Image SOP Instances, using values from the corresponding Requested Procedure:​

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•​create a Request Attributes Sequence containing an Item containing the following Attributes:​ •​Requested Procedure ID​

•​Scheduled Procedure Step ID​ •​Scheduled Procedure Step Description​ •​Scheduled Protocol Code Sequence​

•​copy from the Modality Worklist:​ •​Study Instance UID​ •​Accession Number​

•​create a Referenced Study Sequence containing an Item containing the following Attribute:​ •​Study SOP Instance in the Referenced Study Sequence from the Worklist​

•​In the MPPS SOP Instance (if supported):​

•​create a Scheduled Step Attributes Sequence containing two or more Items each containing the following Attributes:​ •​Study Instance UID​

•​Referenced Study Sequence​ •​Accession Number​ •​Requested Procedure ID​ •​Scheduled Procedure Step ID​

•​Scheduled Procedure Step Description​ •​Scheduled Protocol Code Sequence​

•​include the following Attribute value that may be generated during image acquisition, if supported:​ •​Procedure Code Sequence​

•​In both the Image SOP Instances and the MPPS SOP Instance (if supported):​ •​create a Performed Procedure Step ID​

•​include the following Attribute values that may be generated during image acquisition, if supported:​ •​Performed Procedure Step Start Date​

•​Performed Procedure Step Start Time​ •​Performed Procedure Step Description​ •​Study ID​

J.5 MPPS SOP Instance Created by Another System (not the Modality)​

If for some reason the Modality was unable to create the MPPS SOP Instance, another system may wish to perform this service. This​ system must make sure that the created PPS SOP Instance is consistent with the related Image SOP Instances.​

Depending on the availability and correctness of values for the Attributes in the Image SOP Instances, these values may be copied​ into the MPPS SOP Instance, or they may have to be coerced, e.g., if they are not consistent with corresponding values available​ from the IS.​

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Forexample,iftheMPPSSOPInstanceUIDisalreadyavailableintheImageSOPInstance(intheReferencedPerformedProcedure​ Step Sequence), it may be utilized to N-CREATE the MPPS SOP Instance. If not available, a new MPPS SOP Instance UID may be​ generatedandusedtoN-CREATEtheMPPSSOPInstance.InthiscasetheremaybenoMPPSSOPInstanceUIDintheReferenced​ Performed Procedure Step Sequence in the corresponding Image SOP Instances. An update of the Image SOP Instances will restore​ the consistency, but this is not required.​

J.6 Mapping of Study Instance UIDs to the Study SOP Instance UID​

Retired. See PS3.17-2004.​

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