Radiation Oncology Actor review request

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Mary Jungers

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Jun 3, 2025, 12:52:39 PM6/3/25

to d...@ihe.net, David....@iba-group.com

Dear members of the Domain Coordination Committee,

Please read and respond as applicable to the following request from the Radiation Oncology Technical Committee. Thank you!

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As we did not have the time to review the revised and new actors definitions brought by the IHE-RO TDW-II profile supplement and, in order to be able to move forward with the publication of the profile in a new RO TF version, we would like to have your review of the following changes:

Supplement Name	Actor Name	New or Modified	New or Modified Description	Current Description
Treatment Delivery Workflow-II	Treatment Management System	Modified	An information system that manages the radiation oncology treatment process.	Manages oncology information and is responsible for the scheduling of radiotherapy activities. Consumes beams for use in treatment delivery and manages the treatment in the Radiation Oncology workflow
Treatment Delivery Workflow-II	Object Storage	New	An information system that provides short-term storage and retrieval of DICOM RT objects and other DICOM modalities objects for the duration of a treatment course.	na

To ease your review, here is a bit of context:

TDW-II is a workflow profile specifying the transactions between 3 actors for delivering radiation with a TDD (typically part of a radiotherapy machine) of a treatment session scheduled by a TMS (typically part of an Oncology Information System).

This managed workflow transactions are based on Unified Procedure Step DICOM Services.

Treatment Management System (TMS) actor definition modification

The TMS was already defined in another profile as:

“ An application providing radiation oncology management services and capable of consuming treatment plans with any of the above treatment techniques”

and DCC noticed that the previous definition was not matching the definition proposed in TDW-II:

“Manages oncology information and is responsible for the scheduling of radiotherapy activities. Consumes beams for use in treatment delivery and manages the treatment in the Radiation Oncology workflow”

In order to solve the issue, the RO TC did revise the definition to be more generic and reusable for both profiles:
“An information system that manages the radiation oncology treatment process”

Each profile does further describe the specific responsibilities of the TMS actor in the context of the profile use cases.

Object Storage (OST) new actor definition:

The TDW-II profile was developed to replace the TDW profile, and brought 2 significant changes:

Updates to account for differences between the drafts and final versions of DICOM Supplements 74 (RT delivery instructions) and Supplement 96 (Unified Procedure Step)
The introduction of a separate actor, the OST, for the storage and retrieval of the DICOM instances which are not dynamically generated for each treatment session. Re-using already defined Archive actors was discussed and finally rejected in the RO TC because of the specificities of supporting RT objects and the transient nature of the storage during the treatment session.
The proposed definition is:

“An information system that provides short-term storage and retrieval of DICOM RT objects and other DICOM modalities objects for the duration of a treatment course.”

Here is the overview of the Actors and Transactions of TDW-II