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Absorbed dose estimates at the cellular level for 131I
Perihan Unak1, Berkan Cetinkaya
1Department of Nuclear Applications, Institute of Nuclear Sciences, Ege University, Bornova, Izmir 35100, Turkey. unak@bornova.ege.edu.tr
Summary
Iodine-131 (131I) microdosimetry calculations reveal increased absorbed doses in cell clusters due to cross-fire irradiation. This finding supports 131I
Area of Science:
- Medical Physics
- Radiological Dosimetry
- Nuclear Medicine
Background:
- Accurate microdosimetric calculations are crucial for optimizing radionuclide therapy.
- Understanding energy deposition at the cellular level is key to predicting treatment efficacy.
- Iodine-131 (131I) is a commonly used radionuclide in nuclear medicine, particularly for thyroid cancer treatment.
Purpose of the Study:
- To perform detailed microdosimetric calculations for Iodine-131 (131I) in single cells and cell clusters.
- To evaluate the impact of cellular chemical composition and cluster geometry on absorbed radiation dose.
- To assess the potential of 131I for targeted cancer therapy based on absorbed dose distributions.
Main Methods:
- Utilized a VsBasic program for microdosimetric calculations, including stopping power, linear energy transfer, range, and energy deposition.
- Modeled energy deposition for beta particles, Auger electrons, and conversion electrons emitted by 131I.
- Compared dose calculations in a cellular model with a water medium.
- Calculated total absorbed doses for randomly distributed 131I within single cells and cell clusters.
- Incorporated cross-fire irradiation effects for cell clusters.
Main Results:
- Microdosimetric parameters for 131I were calculated for single cells and cell clusters.
- Absorbed doses per cell within clusters were significantly higher than for single cells, influenced by cluster size.
- Cross-fire irradiation in cell clusters leads to enhanced dose deposition.
- The cellular chemical composition was considered, with comparisons to water.
Conclusions:
- 131I demonstrates significant potential as a therapeutic radionuclide for tumors ranging from millimeter to centimeter dimensions.
- The enhanced absorbed dose in cell clusters due to cross-fire irradiation supports its efficacy in treating larger or aggregated tumor volumes.
- Microdosimetric modeling provides valuable insights for optimizing 131I-based radiotherapy.