Starting September 1st, 2024 TRIAD site server for DIR is being discontinued and support for the software will no longer be available. To avoid a disruption in DIR data transmission for your site, please contact our team at to install ACR Connect and activate DIR Link. If you have already scheduled or completed ACR Connect installation - no further action is needed.

The National Radiology Data Registry is a data warehouse for the registries listed below. The primary purpose of NRDR is to aid facilities with their quality improvement programs and efforts to improve patient care by comparing facility data to that of their region and the nation. A practice or facility may choose to participate in any or all registries as appropriate for their practice. When a facility joins more than one registry, the warehouse allows information to be shared across registries within the facility.
Quality Improvement Registries
All NRDR registries are certified as a Practice Quality Improvement (PQI) projects toward American Board of Radiology Part IV Maintenance of Certification (MOC) credit.
CTC Registry
The CT Colonography (CTC) Registry collects measure data valuable for evaluating CTC procedures and for evaluating CTC as an alternative to colonoscopy. By submitting patient and procedure data to the CTC Registry, participants receive feedback reports by facility and by physician, as well as comparisons with the entire registry.
The Dose Index Registry (DIR) provides feedback reports that allows facilities to compare their CT, fluoroscopy and digital radiography dose indices' performance with all DIR participants by standardized exam and procedure name and age group. The registry data are used to establish national dose indices benchmarks.
The DIR supports reporting requirements for the Merit-based Incentive Payment System (MIPS).
The General Radiology Improvement Database (GRID) collects imaging facility data that are aggregated so that facilities can compare their performance to those of similar size and type and to the entire registry. Comparison results are available for turnaround times, patient wait times, patient satisfaction and many other process and outcome measures to help identify areas for quality improvement.
For physicians participating in CMS’s Merit-based Incentive System (MIPS), the GRID provides a means of comparing results of the various imaging measures included in MIPS.
The ACR Lung Cancer Screening Registry (LCSR) helps clinicians monitor and demonstrate the quality of their CT lung cancer screening program through feedback reports that include peer and registry benchmarks. Contributing data to the LCSR not only helps clinicians improve their own quality of care, but also helps improve and refine lung cancer screening care for everyone at the national level.
The ACR National Radiology Data Registry (NRDR) has been approved as a Qualified Clinical Data Registry (QCDR) for the CMS Merit-Based Incentive Payment System (MIPS). Radiologists may use the NRDR QCDR to meet MIPS participation requirements. By using the QCDR to participate in the MIPS program, radiologists can avoid a negative payment adjustment for not reporting and potentially earn an incentive. ACR submits physician and/or group practice quality measure data, improvement activities and advancing care information measure data to CMS. For more information visit
The National Mammography Database (NMD) leverages data that radiology practices are already collecting under federal mandate to provide them with comparative information for national and regional benchmarking. Participants access feedback reports that include valuable benchmarking data such as true positive rates, positive predictive value rates and recall rates.
3D Printing
The 3D Printing Registry collects anonymized 3D printing case information to address questions about the clinical indications and intended uses for printed models, the source imaging, the model construction techniques and effort, the 3D printing techniques and effort, and the clinical impact of the models.
Pilot and Research Registries
The ACR’s NRDR team continually looks for additional opportunities for supporting quality improvement efforts in radiology and improved patient care through a clinical quality registry. When new initiatives are identified, the concepts, processes and functionality required are piloted with a small number of test (or pilot) sites before opening a new registry for general participation. Should you be interested in participating in a pilot effort, please contact us for more information at
The Assess-AI Registry provides monitoring of artificial intelligence (AI) algorithm performance in clinical practice by capturing real-world data during clinical use. Assess-AI collects the output of the AI algorithm, the final result from the radiologist at the point of care, and metadata about the exam.