EngineerHub.orgCompare representative doses from medical imaging
Add one or more examinations. The calculator totals typical values and a broad low-to-high range, then compares the result with natural background radiation.
Add an examination
Dose comparison
Representative dose library
Values are broad educational ranges, not diagnostic reference levels for a specific facility.
| Examination | Low (mSv) | Typical (mSv) | High (mSv) |
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Background
Open a section to understand the model, equations and limitations.
Effective dose combines organ doses using radiation and tissue weighting factors. It is useful for broad comparison and protection planning, but it is not a measurement of the dose to every organ and is not designed to predict one patient’s outcome.
Protocol, equipment generation, scan length, patient size and image-quality requirements can change dose substantially. A range is more honest than a single universal number.
UNSCEAR evaluates diagnostic radiology, CT, image-guided procedures, nuclear medicine and radiotherapy at population level. This page focuses on common diagnostic examinations.
The decision to perform an examination belongs to the patient and clinical team. Radiation protection seeks justification and optimization, not the lowest possible dose regardless of diagnostic need.
Dose limits do not apply to justified medical exposure of patients. Applying a fixed limit could prevent a clinically beneficial examination. Radiation protection instead relies on justification and optimization.
Diagnostic reference levels (DRLs) are investigation and optimization tools for typical examinations and groups of patients. They are not limits, do not determine whether one individual examination was appropriate and should be expressed using the practical dose quantities used by the imaging service.
Frequently Asked Questions
Practical questions about interpretation and use.
No. They are representative effective-dose ranges for comparison. Actual dose depends on equipment, protocol, patient size, anatomy and clinical indication.
No. Medical imaging is justified by clinical benefit. Dose comparisons should not be used to avoid or delay a medically recommended examination.
A precise individual risk cannot be inferred reliably from a generic effective-dose estimate. The page therefore reports dose ranges and background-equivalent time only.
This version focuses on representative examination values. A future advanced module could accept DLP with region-specific conversion coefficients, but those coefficients also carry uncertainty.