Editor’s Capsule Summary
What is already known on this topic
Resource use, including low-value imaging, is a measure of health care quality.
What question this study addressed
Can a collaborative multisite data registry be used to measure low-value imaging?
What this study adds to our knowledge
Substantial variability exists in avoidable radiographs and computed tomographic scans in US emergency departments.
How this is relevant to clinical practice
Regional registries can be used to benchmark and study local resource use.