Energy dependence of EBT-1 radiochromic film response for photon (10kVp-15MVp) and electron beams (6-18MeV) readout by a flatbed scanner

Medical Physics
Christian RichterJulia Woithe

Abstract

The aim of this article is to investigate the energy dependence of the radiochromic film type, Gafchromic(™) EBT-1, when scanned with a flatbed scanner for film readout. Dose response curves were determined for 12 different beam qualities ranging from a10kVp x-ray beam to a 15MVp x-ray beam and include also two high energy electron beam qualities (6 and 18MeV). The dose responses measured as net optical density (netOD) for the different beam qualities were normalized to the response of a reference beam quality (6MVp). A strong systematic energy dependence of the film response was found. The lower the effective beam energy, the less sensitive the EBT-1 films get. The maximum decrease in dose for the same film response between the25kVp and 6MVp beam qualities was 44%. Additionally, a difference in energy dependence for different doses was discovered, meaning that higher doses show a smaller dependency on energy than lower doses. The maximum decrease in the normalized netOD was found to be 25% for a dose of 0.5Gy relative to the normalized netOD for 10Gy. Moreover, a scaling procedure is introduced, allowing the correction of the energy dependence for the investigated beam qualities and also for comparable x-ray beam qualities wit...Continue Reading

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