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  • Title: Portal verification of high-energy electron beams using their photon contamination by film-cassette systems.
    Author: Geyer P, Baus WW, Baumann M.
    Journal: Strahlenther Onkol; 2006 Jan; 182(1):37-44. PubMed ID: 16404519.
    Abstract:
    BACKGROUND AND PURPOSE: Though electron beams are widely used in radiotherapy, their verification is not well established in clinical practice. The present study compares the suitability of several sensitive film-cassette systems for electron-portal verification by contaminating photons. MATERIAL AND METHODS: The characteristics of the optical density curves of film-cassette combinations were determined by exposing them to the bremsstrahlung contamination of a variety of electron beams. Using a Las-Vegas Phantom the spatial low-contrast resolution of the combinations was investigated. The absorbed dose rates due to the contaminant photons were measured for different geometric conditions. RESULTS: Suitable film-cassette combinations were found for portal verification of all usual electron energies. The best image quality was obtained using the EC film and the EC-L cassettes. For electron energies higher than 6 MeV some film-cassette combinations are suitable to verify abutted electron and photon portals using the same film sheet. CONCLUSION: The verification of electron portals and of abutted electron-photon portals can be performed by sensitive film-cassette systems with an image quality comparable to photon-beam verification.
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