ArticlePhysics and imaging in radiation oncology2026
Benchmarking a new radiochromic film type for photon and proton beam dosimetry.
Article in Physics and imaging in radiation oncology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background and Purpose: EBT4 Radiochromic films (RCFs) are replacing the well-described EBT3 type. This study aimed to benchmark the EBT4 type against its predecessor for photon (kV and MV) and proton beam dosimetry. Materials and Methods: Differences between the film types regarding the signal-to-noise ratio (SNR) were investigated in 6 MV photon and 148.2 MeV proton beams in the dose range of 0.2 Gy to 10 Gy for all RGB channels. The effect of the dose-averaged linear energy transfer (LET Results: The SNR of EBT4 films was statistically superior for MV-photon irradiations above 1.5 Gy in the red channel by up to 29 %. For low-dose proton irradiations, the SNR of EBT3 was higher. The underresponse of both film types in a proton SOBP reached 5 to 7 %. In low kV X-ray beams, EBT4 deviated from EBT3 on average by 2.5 %. For irradiations of films with a dose of 2 Gy or less after 216 days of storage, smaller differences in terms of pixel values were observed for films placed at 10°C. Conclusions: The presented results are in accordance with recent studies on EBT4 films and extend the knowledge on this film type, especially regarding proton beams and film storage.
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