The Dose Index Registry (DIR) is a data registry that allows facilities to compare their CT dose indices to regional and national values. Information related to dose indices for all CT exams is collected, anonymized, transmitted to the ACR, and stored in a database. Institutions are then provided with periodic feedback reports comparing their results by body part and exam type to aggregate results.

The American Board of Radiology has qualified the DIR registry as meeting the criteria for practice quality improvement (PQI), toward the purpose of fulfilling requirements in the ABR Maintenance of Certification Program.

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Please see our Registration Process and Fee Schedule to get started with the registration process.

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From the Joint Commission in response to a question related to PI.02.01.01

The ACR DIR provides benchmark data. The intent of PI.02.01.01 is to ensure that the organization is committed to dose optimization and stays current with standard of practice. Since the frequency of data collection and analysis is under the organization's purview, participation in the ACR DIR would meet compliance with PI.02.01.01.

  • This is a general statement about compliance, and is not a guarantee of “no finding” at PI.02.01.01 on an individual survey.
  • There are other ways to comply with PI.02.01.01.


The automated patient size estimation 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.

Quality Improvement Registry for CT Scans in Children

Quality Improvement Registry for CT Scans in Children

The QuIRCC is a coalition of six children’s hospitals working to develop best practices for optimal CT scan technique and dose indices in children.