The ACR’s recent introduction of the “cmbX” designation in the Dose Index Registry (DIR) is a meaningful step forward. By separating combination studies, the DIR now allows for more accurate mapping to combination RPIDs—or, when necessary, assignment to RPID88 to remove them from the “unmapped” category. But as many facilities are now discovering, this improvement… Read More
Streamlining cmbX Mapping in the ACR Dose Index Registry
Background On February 17, 2026 the American College of Radiology (ACR) announced an important enhancement to the Dose Index Registry (DIR): the introduction of a “combination study” designation, identified by the cmbX prefix in Study Descriptions. This change represents a meaningful improvement in how the DIR handles multi-part or combined CT exams. The Challenge While… Read More
Important DIR Update – Combination Exam Mapping Changes
To my Dose Registry Clients and Friends, The DIR recently announced changes in how the NRDR maps combination CT studies. In my opinion, this is one of the most significant and welcome changes to the DIR in years. See the link immediately below. https://nrdrsupport.acr.org/support/solutions/articles/11000135515-dir-improves-the-accuracy-of-combination-exams-for-ct The article explains changes to how the DIR records and processes… Read More
Dose Registry Support Services 