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. 2018 Oct 17;4(10):e00864.
doi: 10.1016/j.heliyon.2018.e00864. eCollection 2018 Oct.

Effect of scanning parameters on dose-response of radiochromic films irradiated with photon and electron beams

Nashrulhaq Tagiling  1 , Raizulnasuha Ab Rashid  1 , Siti Nur Amirah Azhan  1 , Norhayati Dollah  2 , Moshi Geso  3 , Wan Nordiana Rahman  1
Affiliations

Effect of scanning parameters on dose-response of radiochromic films irradiated with photon and electron beams

Nashrulhaq Tagiling et al. Heliyon. .

Abstract

Proper dosimetry settings are crucial in radiotherapy to ensure accurate radiation dose delivery. This work evaluated scanning parameters as affecting factors in reading the dose-response of EBT2 and EBT3 radiochromic films (RCFs) irradiated with clinical photon and electron beams. The RCFs were digitised using Epson® Expression® 10000XL flatbed scanner and image analyses of net optical density (netOD) were conducted using five scanning parameters i.e. film type, resolution, image bit depth, colour to grayscale transformation and image inversion. The results showed that increasing spatial resolution and deepening colour depth did not improve film sensitivity, while grayscale scanning caused sensitivity reduction below than that detected in the Red-channel. It is also evident that invert and colour negative film type selection negated netOD values, hence unsuitable for scanning RCFs. In conclusion, choosing appropriate scanning parameters are important to maintain preciseness and reproducibility in films dosimetry.

Keywords: Nuclear physics.

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Figures

Fig. 1
Fig. 1
Default dose-response curves of irradiated EBT2 films (A) and EBT3 films (B) for photon and electron beams.
Fig. 2
Fig. 2
Dose-response comparison of colour positive and colour negative film type parameter for EBT2 and EBT3 films (A, B) with the corresponding relative netOD difference percentages (C, D) across four beam energies.
Fig. 3
Fig. 3
Dose-response comparison of three spatial resolutions for EBT2 and EBT3 films (A, B) with the corresponding relative netOD difference percentages (C, D) across four beam energies.
Fig. 4
Fig. 4
Dose-response comparison of three different image bit depths for EBT2 and EBT3 films (A, B) with the corresponding relative netOD difference percentages (C, D) across four beam energies.
Fig. 5
Fig. 5
Dose-response curves of colour to grayscale transformation and its netOD Rdiff percentages for EBT2 films (A, C) and EBT3 films (B, D) in photon and electron beams.
Fig. 6
Fig. 6
Dose-response curves of image inversion and its netOD Rdiff percentages for EBT2 films (A, C) and EBT3 films (B, D) in photon and electron beams.
Fig. 7
Fig. 7
Dose-response curves of grayscale type and its netOD Rdiff percentages for EBT2 films (A, C) and EBT3 films (B, D) in photon and electron beams.
See this image and copyright information in PMC

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