J.4.1 Choose or Create a Value for Study Instance UID and Accession Number

The modality may:

  1. In the Image SOP Instances:

  2. create a Request Attributes Sequence containing two or more Items each containing the following Attributes:

  3. Requested Procedure ID

  4. Scheduled Procedure Step ID

  5. Scheduled Procedure Step Description

  6. Scheduled Protocol Code Sequence

  7. 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

  8. select one value from the Modality Worklist or generate a new value for:

  9. Study Instance UID

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

  11. Accession Number

  12. In the MPPS SOP Instance:

  13. create a Scheduled Step Attributes Sequence containing two or more Items each containing the following Attributes:

  14. Study Instance UID

  15. Referenced Study Sequence

  16. Accession Number

  17. Requested Procedure ID

  18. Scheduled Procedure Step ID

  19. Scheduled Procedure Step Description

  20. Scheduled Protocol Code Sequence

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

  22. Procedure Code Sequence

  23. In both the Image SOP Instances and the MPPS SOP Instance

  24. create a Performed Procedure Step ID

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

  26. Performed Procedure Step Start Date

  27. Performed Procedure Step Start Time

  28. Performed Procedure Step Description

  29. 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.

Both Image SOP Instances may reference a single MPPS SOP Instance (via the MPPS SOP Instance UID in the Referenced Performed Procedure Step Sequence).

Each individual Image SOP Instance may reference it’s own related Study SOP Instance, if it exists (via the Referenced Study Sequence). 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:

  1. For all Series in the MPPS, replicate the entire Series of Images using new Series Instance UIDs

  2. 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

  3. In each of the Image SOP Instances, using values from the corresponding Requested Procedure:

  4. create a Request Attributes Sequence containing an Item containing the following Attributes:

  5. Requested Procedure ID

  6. Scheduled Procedure Step ID

  7. Scheduled Procedure Step Description

  8. Scheduled Protocol Code Sequence

  9. copy from the Modality Worklist:

  10. Study Instance UID

  11. Accession Number

  12. create a Referenced Study Sequence containing an Item containing the following Attribute:

  13. Study SOP Instance in the Referenced Study Sequence from the Worklist

  14. In the MPPS SOP Instance (if supported):

  15. create a Scheduled Step Attributes Sequence containing two or more Items each containing the following Attributes:

  16. Study Instance UID

  17. Referenced Study Sequence

  18. Accession Number

  19. Requested Procedure ID

  20. Scheduled Procedure Step ID

  21. Scheduled Procedure Step Description

  22. Scheduled Protocol Code Sequence

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

  24. Procedure Code Sequence

  25. In both the Image SOP Instances and the MPPS SOP Instance (if supported):

  26. create a Performed Procedure Step ID

  27. Include the following Attribute values that may be generated during image acquisition, if supported:

  28. Performed Procedure Step Start Date

  29. Performed Procedure Step Start Time

  30. Performed Procedure Step Description

  31. Study ID