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Comparison of Dose–Response Curves between EBT-XD and EBT3 Radiochromic Films at High Dose Range (2000–4500 cGy) for a 175 MeV Proton Beam

  • RADIOBIOLOGY, ECOLOGY AND NUCLEAR MEDICINE
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Abstract

To characterise and compare the response of EBT-XD and EBT3 radiochromic films at high doses (up to 4500 cGy) for a 175 MeV energy proton beam. EBT-XD and EBT3 film dosimeters were irradiated by a proton beam with 175 MeV. In order to establish dose response curves, each film piece was exposed to radiation doses 50–4500 cGy. The films were irradiated to doses of 200, 1000, 2000, and 4000 cGy and non-irradiated to determine the lateral response artifact (LRA) for varied lateral positions. The influence of film orientations (0°, 90°, and 45°) on the scanner bed was examined. Net optical density (netOD) for the films was measured at 24, 48, 72 h and 1-week post-irradiation. Digital images were created using an EPSON 11 000 XL scanner. To analyse and present our results we use: ImageJ (v. 2.0) and OriginPro 2015. The red mode netOD was lower in the EBT-XD film, with a netOD for 4500 cGy of 0.610 (EBT-XD) versus 0.893 (EBT3). The EBT-XD film presented a better lateral response than the EBT3. For films irradiated at 4000 cGy placed near the scanner edge, the differences from the central position were 17 and 16.7% (EBT3) and 10.8 and 9.1% (EBT-XD). The EBT3 film presented a satisfactory dose-response for doses <2000 cGy and would be suitable for dosimetry in standard and hypofractionated proton therapy. The EBT-XD film, however, performs better for ultra-hypofractionated proton therapy (>2000 cGy). The new EBT-XD could be a suitable dosimeter for emerging techniques, such as FLASH and Arc proton therapy.

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ACKNOWLEDGMENTS

The authors wish to thank Bradley Londres for his assistance in editing and improving the text.

Funding

This research was funded by National Science Center (grant no. 2015/19/B/NZ7/03811).

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Correspondence to D. M. Borowicz.

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Borowicz, D.M., Kruszyna-Mochalska, M., Shipulin, K. et al. Comparison of Dose–Response Curves between EBT-XD and EBT3 Radiochromic Films at High Dose Range (2000–4500 cGy) for a 175 MeV Proton Beam. Phys. Part. Nuclei Lett. 18, 691–699 (2021). https://doi.org/10.1134/S1547477121060030

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