EANM Pediatric Activity Estimator
Estimate administered activity using the EANM-style method: Activity = Baseline Activity × Weight Multiplier, then apply minimum/maximum limits.
Conversion: 1 mCi = 37 MBq
What is an EANM pediatric dose calculator?
In pediatric nuclear medicine, dose optimization is essential: we need enough activity for diagnostic image quality while keeping radiation exposure as low as reasonably achievable. The EANM approach provides a standardized framework by combining a baseline activity with a weight-based multiplier.
A pediatric dose calculator helps teams quickly estimate activity in MBq, reduce manual math errors, and make dose decisions more consistent across staff and shifts.
How this calculator works
Core equation
The calculator uses:
Administered activity (MBq) = Baseline activity (MBq) × Weight multiplier
After that, it applies practical boundaries:
- Minimum activity to maintain acceptable image quality
- Maximum cap to avoid exceeding local or protocol limits
Weight multiplier
Multipliers are derived from an EANM-style pediatric weighting table and interpolated for intermediate weights. This gives a smoother estimate when the child’s exact weight is between listed table points.
How to use the calculator in practice
- Select a preset tracer (or choose Custom).
- Enter patient weight in kilograms.
- Confirm baseline, minimum, and optional maximum activity.
- Click Calculate Dose.
- Review both MBq and mCi output and note any min/max adjustments.
Example
Suppose baseline activity is 25 MBq, patient weight is 20 kg, and the corresponding weight multiplier is ~3.43:
- Raw estimate = 25 × 3.43 = 85.8 MBq
- If minimum is 14 MBq, no minimum correction is needed
- If maximum is 370 MBq, no cap is triggered
- Final recommendation = 85.8 MBq (about 2.32 mCi)
Best-practice notes for pediatric nuclear medicine
1) Verify protocol version
Dose cards can be updated over time. Confirm that your department is using the currently approved institutional or national protocol.
2) Document assumptions
Record weight source, decay correction timing, and whether activity was capped by minimum/maximum constraints.
3) Coordinate image quality with dose strategy
Acquisition time, collimation, reconstruction settings, and patient motion can all affect quality. Dose planning should be integrated with full scan workflow.
Important disclaimer
This page does not replace clinical judgment. It is not a medical device and should not be used as the sole basis for treatment decisions. Always follow your local regulations, radiopharmacy guidance, and supervising physician instructions.