NRDR Publications Highlights

The NRDR publications featured below provide insight into a broad range of topics related to the practice of radiology, e.g., improvements and gaps in care delivery, opportunities for quality improvement and information about clinical practice helpful for radiology practice leaders and policy makers.

Recent Publications

From the CT Colonography Registry


A new study, based on data from the ACR National CT Colonography Registry, concludes the number of screening CTC exams decreased after age 65. This is likely due, at least in part, to lack of Medicare coverage. The study, published in the JACR®, also indicates a large impact on minority patients.

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From the Dose Index Registry


An analysis of data from the Dose Index Registry (DIR) demonstrates the effect of COVID-19 on reducing the number of US CT exams performed, reflecting delayed and deferred care, especially in states with greater unemployment. Despite rising positive COVID-19 tests, the analysis published online October 21, 2020 in the JACR® suggests partial recovery of CT volume has occurred.

Tracking of US CT volume across the 2,398 DIR participating practices continues as presented in the graph below.

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Performed vs. Expected US CT Volume: An Analysis of DIR Data from 2020 to Current Week


The comparison graph of performed (blue line) vs. expected (orange line) CT volumes from 2,195 radiology practices is updated weekly starting in January 2020. Expected CT volumes are based on 2019 data with an assumed 3% growth rate. Actual CT volumes are for facilities participating in the DIR since January 2019.