Approximate effective radiation doses for common imaging examinations in adults — with natural background radiation equivalents. Source: RadiologyInfo.org / RSNA / ACR (04.25).
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Comparing:
Note: This reference simplifies a highly complex topic. Effective doses are typical values for an average-sized adult. Actual dose varies substantially based on patient size and imaging practice variation. Pediatric doses differ significantly from adult doses. Patients with radiation dose questions should consult their medical physicist and/or radiologist. Background radiation context: Average US annual natural background radiation ≈ 3 mSv/year. All comparisons use this baseline.
Source: RadiologyInfo.org for Patients, Radiological Society of North America (RSNA) & American College of Radiology (ACR), 04.25.