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OEDIPE: a personalized dosimetric tool associating voxel-based models with MCNPX
Sophie Chiavassa1, Manuel Bardiès, Françoise Guiraud-Vitaux
1Institute for Radiological Protection and Nuclear Safety, IRSN/DRPH/SDI, Fontenay-aux-Roses, France. Sophie.Chiavassa@nantes.inserm.fr
Cancer Biotherapy & Radiopharmaceuticals
|July 2, 2005
Summary
OEDIPE software enables personalized internal dosimetry for nuclear medicine and radiation safety by creating patient-specific models from CT/MRI scans. This tool calculates absorbed doses, aiding in targeted radiotherapy and internal contamination assessments.
Area of Science:
- Medical Physics
- Radiological Sciences
- Computational Biology
Background:
- Personalized internal dosimetry is crucial for optimizing nuclear medicine procedures and radiation safety.
- Accurate dose assessment requires patient-specific anatomical and functional data.
- Existing tools may lack the integration of advanced imaging and Monte Carlo simulations for detailed dosimetry.
Purpose of the Study:
- To introduce OEDIPE (Tool for Personalized Internal Dose Assessment), a novel software for personalized internal dosimetry.
- To enable detailed dose calculations for nuclear medicine (diagnostic and therapeutic) and radiation safety applications.
- To develop a user-friendly tool integrating patient imaging with advanced Monte Carlo dose calculations.
Main Methods:
- Development of OEDIPE software using PV-Wave by IRSN and INSERM.
- Creation of anthropomorphic voxel-based phantoms from patient CT and MRI images.
- Image segmentation tools for VOI localization and cumulated activity assessment using SPECT.
- Specification of radiation sources (organ-based, point, or distributed) and dosimetric parameters (organ dose or distribution).
- Integration with MCNPX Monte Carlo code for dose calculation.
Main Results:
- OEDIPE computes absorbed doses per organ in minutes or per voxel (spatial distribution) in hours.
- Software automatically processes MCNPX output for organ dose lists or isodose curve plots.
- Modifications were implemented to reduce computational times for whole-body dosimetry.
- Demonstrated utility with a case study on technetium-99m bone-scanning agent dosimetry.
Conclusions:
- OEDIPE provides a robust platform for patient-specific internal dosimetry.
- The tool facilitates personalized dosimetry in targeted radiotherapy by incorporating individual patient anatomy, including tumors.
- OEDIPE enhances accuracy and applicability of internal dose assessments in nuclear medicine and radiation protection.