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Multicellular dosimetry in voxel geometry for targeted radionuclide therapy
A Malaroda1, G D Flux, F M Buffa
1Joint Dept. of Physics, Institute of Cancer Research and Royal Marsden Hospital, London, UK. aless@icr.ac.uk
Cancer Biotherapy & Radiopharmaceuticals
|September 5, 2003
Summary
A new software package simulates radiation dose at cellular and multicellular levels, considering radionuclide uptake location and tissue geometry. This tool aids in understanding absorbed doses and dose-rates for targeted internal radiotherapy applications.
Area of Science:
- Medical Physics
- Radiological Dosimetry
- Computational Biology
Background:
- Accurate absorbed dose and dose-rate calculations are crucial for internal radiotherapy.
- Previous methods often simplified cellular and multicellular geometries and radionuclide distribution.
- The need for sophisticated software to model complex biological systems and radionuclide behavior exists.
Purpose of the Study:
- To develop and validate a software package for simulating absorbed doses and dose-rates at cellular and multicellular scales.
- To investigate the impact of radionuclide localization and cellular geometry on dose distribution.
- To enable the use of voxel geometry for realistic modeling of tissue structures and heterogeneous activity.
Main Methods:
- Development of a software package utilizing analytical point-dose kernels for Iodine-131, Phosphorus-32, and Yttrium-90.
- Simulation of cell assemblies with defined number, size, and geometry, including nucleus, cytoplasm, membrane, and extracellular space uptake.
- Validation against literature data for spherical geometry at the cellular scale and Monte Carlo simulations in voxel geometry at the multicellular scale.
Main Results:
- Software validated at cellular scale against spherical geometry and at multicellular scale against Monte Carlo simulations.
- Absorbed dose distributions within a single cell showed significant variation based on activity localization and cellular geometry.
- Multicellular dose-rate distribution was heterogeneous, even for long-range radionuclides, when using a 2D heterogeneous activity distribution from spheroid imaging.
Conclusions:
- The developed software accurately calculates absorbed doses and dose-rates at cellular and multicellular levels.
- Activity localization within cells significantly influences absorbed dose.
- The software's ability to use voxel geometry allows for realistic modeling of heterogeneous radionuclide distributions and complex tissue structures, improving internal radiotherapy planning.