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EJNMMI Research

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Open Access 01-12-2014 | Original research

Dosimetric analysis of ¹²³I, ¹²⁵I and ¹³¹I in thyroid follicle models

Authors: Anders Josefsson, Eva Forssell-Aronsson

Published in: EJNMMI Research | Issue 1/2014

Abstract

Background

Radioiodine is routinely used or proposed for diagnostic and therapeutic purposes: ¹²³I, ¹²⁵I and ¹³¹I for diagnostics and ¹²⁵I and ¹³¹I for therapy. When radioiodine-labelled pharmaceuticals are administered to the body, radioiodide might be released into the circulation and taken up by the thyroid gland, which may then be an organ at risk. The aim of this study was to compare dosimetric properties for ¹²³I, ¹²⁵I and ¹³¹I in previously developed thyroid models for man, rat and mouse.

Methods

Dosimetric calculations were performed using the Monte Carlo code MCNPX 2.6.0 and nuclear decay data from ICRP 107. Only the non-radiative transitions in the decays were considered. The S value was determined for the cell nuclei in species-specific thyroid follicle models for mouse, rat and man for different spatial distributions of radioiodine.

Results

For the species-specific single follicle models with radioiodine homogeneously within the follicle lumen, the highest S value came from ¹³¹I, with the largest contribution from the β particles. When radioiodine was homogeneously distributed within the follicle cells or the follicle cell nucleus, the highest contribution originated from ¹²⁵I, about two times higher than ¹²³I, with the largest contribution from the Auger electrons. The mean absorbed dose calculated for our human thyroid multiple follicle model, assuming homogenous distribution of for ¹²³I, ¹²⁵I, or ¹³¹I within the follicle lumens and follicle cells, was 9%, 18% and 4% higher, respectively, compared with the mean absorbed dose according to Medical Internal Radiation Dose (MIRD) formalism and nuclear decay data. When radioiodine was homogeneously distributed in the follicle lumens, our calculations gave up to 90% lower mean absorbed dose for ¹²⁵I compared to MIRD (20% lower for ¹²³I, and 2% lower for ¹³¹I).

Conclusions

This study clearly demonstrates the importance of using more detailed dosimetric methods and models than MIRD formalism for radioiodine, especially ¹²³I and ¹²⁵I, in the thyroid. For radioiodine homogeneously distributed in the follicle lumens our calculations for the human multiple follicle models gave up to 90% lower mean absorbed dose compared with MIRD formalism.

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Title: Dosimetric analysis of 123I, 125I and 131I in thyroid follicle models
Authors: Anders Josefsson
Eva Forssell-Aronsson
Publication date: 01-12-2014
Publisher: Springer Berlin Heidelberg
Published in: EJNMMI Research / Issue 1/2014
Electronic ISSN: 2191-219X
DOI: https://doi.org/10.1186/s13550-014-0023-9

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Dosimetric analysis of ¹²³I, ¹²⁵I and ¹³¹I in thyroid follicle models

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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