Dose Index Registry

The DIR lets facilities compare their CT dose indices to regional and national values. The information collected is masked, transmitted to the ACR and stored in a database. Facilities receive quarterly feedback reports comparing their results to aggregate results by body part and exam type.

The DIR offers participants additional ways to fulfill reporting requirements for the Merit-based Incentive Payment System (MIPS). Participation also allows credit for Maintenance of Certification (MOC) Part IV requirements of the American Board of Radiology (ABR).

How to Participate

  • Register each facility that will participate in the registry
  • Complete and return a signed participation agreement to NRDR
  • Submit payment, then you can get ready to start submitting your data

Follow our registration process to get started

Already a NRDR participant? Add the DIR to your facility registration.

Log In to NRDR

Need assistance? Visit our help desk

1-800-227-5463 x3535

How to Submit Data

Once your facility is registered, we will activate your unique facility ID number to allow for data transmission. You will receive an email containing a link to the ACR TRIAD software installation guide. The guide will direct you to install TRIAD on a standalone PC or server at your facility. Use the links, below, to learn more about getting started with TRIAD:

We strongly encourage you to review the FAQ before installing the software.

Once you begin submitting data, start standardizing your study descriptions so that your data can be included in aggregate reports and compared with other facility data. You have two ways to do this:

Option 1: Use our online exam name mapping tool

Option 2: Work with RadMapps

Consult our DIR data submission overview for more information about submitting data to the registry.

Certified Software Partners

Core Documents

Related Resources

Dose Index Registry Acknowledgements

The "Automated size-specific CT dose monitoring program: Assessing variability in CT dose" is courtesy of Duke University Clinical Imaging Physics Group. The details of the approach can be found in Christianson O, Li X, Frush DP, Samei E. Automated patient-specific CT dose monitoring system: assessing variability in CT dose. Medical Physics 39(11): 7131-7139. 2012.

The processing of non-RDSR dose screens for the Dose Index Registry is courtesy of PixelMed Publishing, LLC. The open source code of the PixelMed dose-related tools can be found at

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