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Tissue composition effect on dose distribution in neutron brachytherapy/neutron capture therapy
Mohsen Khosroabadi1, Bagher Farhood2, Mahdi Ghorbani3
1Faculty of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran.
Material composition significantly impacts dose distribution in neutron brachytherapy and neutron capture therapy. Accurate treatment planning requires considering specific tissue and material properties for precise radiotherapy delivery.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Neutron brachytherapy and neutron capture therapy are established radiotherapy techniques.
- Accurate dose calculation is crucial for effective cancer treatment.
Purpose of the Study:
- To evaluate how different soft tissue and tissue-equivalent material compositions affect dose distribution.
- To identify potential sources of error in radiotherapy treatment planning.
Main Methods:
- Utilized MCNPX code to simulate dose distributions around a Californium-252 source.
- Calculated dose rates in various soft tissues and tissue-equivalent materials within a spherical phantom.
- Analyzed dose variations at radial distances from 0.3 to 15.0 cm.
Main Results:
- Adipose tissue and plexiglass showed the largest deviations in total dose rate compared to a 9-component soft tissue model.
- Dose rate differences were dependent on material composition and radial distance from the source.
- Water exhibited a different total dose rate compared to the 9-component soft tissue.
Conclusions:
- Using a single composition for diverse tissues can lead to inaccuracies in neutron brachytherapy/neutron capture therapy planning.
- Considering specific material compositions is essential for dose calculation and treatment planning.
- Adherence to International Commission on Radiation Units and Measurements (ICRU) guidelines for dosimetric uncertainty necessitates this consideration.
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