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An approach to 3D dose mapping using Gafchromic film
A M Gueli1, R De Vincolis, A Kacperek
1Dipartimento di Fisica e Astronomia, Università di Catania, viale Andrea Doria 6, 95125 Catania, Italy. anna.gueli@ct.infn.it
Radiation Protection Dosimetry
|December 31, 2005
Summary
Gafchromic MD-55 films accurately map 2D and 3D radiation dose distributions. This study verified real radiotherapy treatments using proton beam irradiation and phantom dosimetry, demonstrating reliable dose reconstruction.
Area of Science:
- Medical Physics
- Radiation Oncology
- Dosimetry
Background:
- Gafchromic films offer tissue-equivalent properties ideal for radiation therapy field mapping.
- Accurate dose verification is crucial for ensuring patient safety and treatment efficacy in radiotherapy.
Purpose of the Study:
- To evaluate the efficacy of Gafchromic MD-55 films for verifying real radiotherapy treatments.
- To assess the capability of MD-55 films in mapping 2D and 3D dose distributions from proton beam irradiation.
Main Methods:
- Proton beam irradiation of phantoms containing Gafchromic MD-55 films at the Clatterbridge Centre for Oncology.
- Optical density measurements using a CCD100 Microdensitometer (665 nm).
- Image analysis with MIRA software for film rendering and 3D-doctor software for volumetric dose reconstruction.
Main Results:
- MD-55 films successfully mapped surface dose distributions based on optical density variations.
- Volumetric dose reconstruction was achieved by elaborating film positions within the phantom.
- The study demonstrated the films' suitability for verifying complex treatment fields.
Conclusions:
- Gafchromic MD-55 films are a reliable tool for 2D and 3D dose verification in proton therapy.
- The methodology allows for accurate reconstruction of volumetric dose distributions in radiotherapy.
- This approach enhances the quality assurance of proton beam treatments.