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.
Log In to NRDR

Need assistance? Visit our help desk

1-800-227-5463 x3535

How to Participate


  • Register each facility that will participate in the registry
  • Complete and return a signed participation agreement to NRDR
  • Fees are due only after you have started submitting your DIR data

Follow the instructions on our How To Get Started page to register.

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.

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

How to Submit Data


Standardized Exam-Name Mapping


Exam-name mapping is required to standardize protocol names which differ by facility or scanner. The DIR has implemented lists of standard name procedures with associated RadLex Playbook ID (RPID) and ACR Common IDs.

Two methods are available for mapping your exams:

Option 1: Use our online Exam Name Mapping Tool

For additional information view the Exam Name Mapping Introduction Webinar

Option 2: Work with RadMapps (available at a reduced cost to NRDR participants)

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