Multimodality Registration for Radiation Oncology

The Image Registration Integration Profile (REG) specifies communications between systems creating and registering image sets.

Summary

Transmitting registration information within the Radiation Oncology domain is becoming an increasingly important to the process of external beam radiation treatments. This profile addresses the ability to convey registered data from one system to another for further processing. This profile addresses issues dealing with multiple coordinate systems but does not specifically address the issue of repeatable fused displays.

Currently, registration can be performed on individual workstations designed for that purpose and planning systems, but the results are not readily transferable between systems, often due either to proprietary or inconsistent implementations. Coordination of data across the RT objects and registration of Image studies is discussed. A collection of DICOM objects exists to address the problem. Their use is constrained and clarified to avoid misinterpretation and promote compatibility.

Counterclock wise from the top left: CT dataset is retrieved, a contour is drawn, a field is placed, dose is calculated and displayed.

Benefits

• defines how DICOM objects for spatial registration and the images themselves are created, stored, queried, retrieved, processed and displayed
• Provides transactions required for interoperability between multi-vendor systems

Details

This Integration Profile specifies how images, RT Structure Sets, RT Doses, and associated spatial registration information can be exchanged, stored, processed and displayed. For a display workstation, it is essential that a workstation correctly identifies the corresponding image sets, matches data from single-slice and multi-slice datasets, matches coordinate systems, and performs spatial translations. The use of relevant DICOM objects (Spatial Registration) is clarified and constrained in order to avoid misinterpretation.
Image Registration Integration Profile focuses on content for image registration and does not define a registration workflow. Such workflow could be managed by using mechanisms described in the Post-Processing Workflow Integration Profile. The Image Registration Integration Profile currently only handles rigid registration. The intention is to add deformable registration as an extension to the Profile in the future.
The Image Registration Profile does not specify the use of quantification methods for the image data that is created or displayed. In particular interoperability for PET Standard Uptake Values (SUV) is considered a relevant future work item for IHE. Note that vendors may wish to prodovide SUV capability even though not required under this Profile.

Actors and Transactions.

Systems Affected

• Radiation Oncology PACS
• Treatment Planning Systems

Specification

Profile Status: Final Text

Documents:

IHE Radiation Oncology Technical Framework:

• Vol. 1 - Section 3 and Appendix A & B
• Radiology registration profile

Underlying Standards:

• DICOM
• DICOM-RT <add a link for DICOM-RT or DICOM Working Group 7>
• HL7

See Also

Related Profiles

• Normal Treatment Planning (Simple) NTPL-S may use .... <link will be added by Colin later>
• Managed Delivery Workflow may include .... <link will be added by Colin later>

Consumer Information

• The REG FAQ answers typical questions about what the Profile does.
• The REG Purchasing describes considerations when purchasing equipment to deploy this Profile.

Implementer Information

• The REG Implementation provides additional information about implementing this Profile in software.

Reference Articles

<List References (good and bad) (with link if possible) to Journal Articles that mention IHE's work (and hopefully include some analysis). Go ahead, Google: IHE <Profile Name> abstract or something. You might be surprised. >

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