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Updated: Mar 30, 2026

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Published on: March 11, 2021
Uncertainty Quantification in Internal Dose Calculations for Seven Selected Radiopharmaceuticals
Vladimir Spielmann1, Wei Bo Li1, Maria Zankl2
1Research Unit Medical Radiation Physics and Diagnostics, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany vladimir.spielmann@helmholtz-muenchen.de wli@helmholtz-muenchen.de.
This study developed a new method to calculate uncertainties in radiopharmaceutical internal doses. This allows for better comparison of diagnostic methods and patient risk analysis in nuclear medicine.
Area of Science:
- Nuclear medicine
- Radiopharmaceutical dosimetry
- Radiation safety
Background:
- International Commission on Radiological Protection (ICRP) and MIRD Committee provide dose coefficients without uncertainty information.
- Uncertainty data is crucial for comparing diagnostic methods and optimizing patient radiation exposure.
- Accurate dose assessment is vital for risk analysis in nuclear medicine.
Purpose of the Study:
- To develop and apply an uncertainty analysis method for internal doses of common radiopharmaceuticals.
- To quantify the uncertainties associated with absorbed and effective doses.
- To provide reliable dose coefficients for nuclear medicine applications.
Main Methods:
- Developed an uncertainty propagation analysis based on ICRP and MIRD Committee recommendations.
- Incorporated uncertainties from pharmacokinetic models and S values derived from voxel phantoms.
- Utilized random and Latin hypercube sampling for parameter and S value uncertainty assessment.
Main Results:
- Organ-absorbed dose uncertainty factors ranged from 1.1 to 3.3.
- Effective dose uncertainties were lower, with a maximum value of approximately 1.4.
- Calculated effective doses showed deviations comparable to ICRP reference values.
Conclusions:
- A general statistical method for calculating absorbed and effective dose uncertainties was established.
- The developed method quantifies dose uncertainties for seven radiopharmaceuticals.
- These uncertainties aid in identifying key dose calculation parameters and support patient risk assessment.
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