Evaluation of Gafchromic® EBT3 films characteristics in therapy photon, electron and proton beams

Sorriaux, Jefferson; Kacperek, Andrzej; Rossomme, Séverine; Lee, John A.; Bertrand, D.; Vynckier, Stefaan; Sterpin, Edmond

doi:10.1016/j.ejmp.2012.10.001

Cited by 189 publications

(164 citation statements)

References 30 publications

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“…The dose vs. net optical density calibration curve is a combination of data obtained for both 6 and 18 MeV electron energies with the resultant fit generated using all data points. Calculation of netOD follows the procedure of Sorriaux et al (20) …”

Section: Resultsmentioning

confidence: 99%

Evaluation of lens dose from anterior electron beams: comparison of Pinnacle and Gafchromic EBT3 film

Sonier

Wronski

Yeboah

2015

J Applied Clin Med Phys

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Lens dose is a concern during the treatment of facial lesions with anterior electron beams. Lead shielding is routinely employed to reduce lens dose and minimize late complications. The purpose of this work is twofold: 1) to measure dose profiles under large‐area lead shielding at the lens depth for clinical electron energies via film dosimetry; and 2) to assess the accuracy of the Pinnacle treatment planning system in calculating doses under lead shields. First, to simulate the clinical geometry, EBT3 film and 4 cm wide lead shields were incorporated into a Solid Water phantom. With the lead shield inside the phantom, the film was positioned at a depth of 0.7 cm below the lead, while a variable thickness of solid water, simulating bolus, was placed on top. This geometry was reproduced in Pinnacle to calculate dose profiles using the pencil beam electron algorithm. The measured and calculated dose profiles were normalized to the central‐axis dose maximum in a homogeneous phantom with no lead shielding. The resulting measured profiles, functions of bolus thickness and incident electron energy, can be used to estimate the lens dose under various clinical scenarios. These profiles showed a minimum lead margin of 0.5 cm beyond the lens boundary is required to shield the lens to ≤10% of the dose maximum. Comparisons with Pinnacle showed a consistent overestimation of dose under the lead shield with discrepancies of ∼25% occurring near the shield edge. This discrepancy was found to increase with electron energy and bolus thickness and decrease with distance from the lead edge. Thus, the Pinnacle electron algorithm is not recommended for estimating lens dose in this situation. The film measurements, however, allow for a reasonable estimate of lens dose from electron beams and for clinicians to assess the lead margin required to reduce the lens dose to an acceptable level.PACS number(s): 87.53.Bn, 87.53.Kn, 87.55.‐x, 87.55.D‐

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Section: Resultsmentioning

confidence: 99%

Evaluation of lens dose from anterior electron beams: comparison of Pinnacle and Gafchromic EBT3 film

Sonier

Wronski

Yeboah

2015

J Applied Clin Med Phys

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“…Cheung et al, 2006, telah mendemostrasikan bahwa kurva kalibrasi film gafchromic EBT dipengaruhi ukuran lapangan dalam range 5×5 cm 2 sampai 40×40 cm 2 [8]. Namun, pembahasan mengenai respon dosis pada film EBT untuk dosimetri elektron masih terbatas [9].…”

Section: Pendahuluanunclassified

“…Hal ini dikarenakan adanya polimerisasi film yang menyebabkan perubahan warna menjadi semakin hitam dengan bertambahnya dosis. Hal ini sesuai dengan penelitian yang dilakukan oleh Sorriaux (2016) [11].…”

Section: Perbandingan Netod Pada Energiunclassified

Karakteristik Dosimetri Film Gafchromic Ebt3 Pada Berkas Elektron Dan Foton

Ulya

Wibowo²,

Nuruddin³

et al. 2016

SPEKTRA

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AbstrakElektron energi tinggi bermanfaat dalam radioterapi target permukaan dapat pula digunakan sebagai eskalasi dosis sumber berkas foton. Dalam jaminan kualitas radioterapi membutuhkan dosimeteryang akurat, respon yang baik terhadapdosis dan energi, resolusi spasial tinggi serta ekuivalen dengan jaringan. Berdasarkan rekomendasi AAPM TG 55, film merupakan dosimeter utama dalam pengukuran sumber radioterapi. Saat ini, film dosimetri yang sering digunakan dalam keperluan pengukuran salah satunya yaitu film gafchromic EBT3, namun penelitian mengenai karakteristik dan respon dosis pada film gafchromic EBT3 masih terbatas. Sehingga penelitian ini bertujuan untuk mengetahui karakteristik dosimetri film EBT3 pada berkas elektron dan foton. Film EBT3 diradiasi pada lapangan 10×10cm 2 menggunakan berkas foton, elektron dan Cobalt-60 dengan rentang dosis (0-500 cGy). Scanner Epson V700 digunakan untuk pemindaian film dalam evaluasi pixel value. NetOD digunakan sebagai parameter untuk menganalisis karakteristik film EBT3. Nilai uncertainty pengaruh energi berada dalam rentang ±1.95% yang menunjukkan bahwa film EBT3 memiliki kebergantungan energi realtif kecil. Pemilihan channelscanner menunjukkan bahwa sensitifitas scannerpaling tinggi adalahRed channel.Pixel value dipengaruhi oleh rotasi film namun tidak oleh orientasi flipped. Pada penelitian ini, rotasi optimum dalam pemindaian film adalah posisi landscape. Kata kunci : dosimetri, film, netOD, uncertainty AbstractHigh energy electron used to treatment radiotherapy superficial target and dose booster photon beam. Quality assurance in radiotherapy required dosimeter which high spatial resolution, good response of doseand energy,and tissue equivalent. Based on the recommendation of AAPM TG 55, the film is primarily dosimeter measurement radiotherapy sources. Recently, film dosimetry usually used in the measurement which one is EBT3 film, however, research about the characteristic and dose response of EBT3 filmare limited. In this study, film EBT3 response on doses and energies variation using electron and photon beams is investigated. Gafchromic EBT3 film was irradiated using electron and photon also cobalt-60 beam energies. In each energy was given 0 -500 cGy doses. Film scanning post-irradiation over a period of 72 hours using EPSON V700 and ImageJ were used to film evaluate. NetOD as the parameter to the analysis of EBT3 film characteristics. Uncertainty was required in the range of ±1.95%. Dose responses of the EBT3 film have small energy dependence..Flipped orientation not dependence on the pixel value but rotation orientation dependence for pixel value in EBT3. From this research, we recommended landscape orientation in EBT3 film scanning.

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“…Another advantage of the EBT3 radiochromic film is that it is less sensitive to indoor lighting. Previous studies have investigated characteristics of the EBT3 radiochromic film including its the energy dependence for x‐ray irradiation,3, 4, 5 particle‐type dependence,6 its utility in intensity‐modulated radiotherapy (IMRT) applications,4 its compared with its predecessor (the EBT2 radiochromic film)7, 8 and spectral analysis of EBT3 film for 6‐MV photon beams 9…”

Section: Introductionmentioning

confidence: 99%

Investigation of EBT3 radiochromic film's response to humidity

León-Marroquín

Lárraga‐Gutiérrez

Herrera-González

et al. 2018

J Applied Clin Med Phys

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PurposeThe aim of this work is to investigate the effects of immersing EBT3 radiochromic film in water and to evaluate its contribution to the total uncertainty in dose determination.Materials and methodsWe used 3 cm × 3 cm EBT3 radiochromic films irradiated in the range of 0–70 Gy to study the impact of water immersion on the change in net optical density. These films were placed in a water container for a period of 24 h. The net optical density was measured before (0 h) and after of the immersion in water (1, 3, 6, 12, 18, and 24 h). The absorbance spectrum of the EBT3 radiochromic film was measured at 0 h and 24 h after immersion in water. The uncertainty in dose determination due to the effects of keeping the EBT3 radiochromic film submerged in water at 0, 1, and 24 h were recorded in the red, green, and blue channels.ResultsWe observed an increase in the net optical density as an effect on the film due to its immersion in water. The penetration of the water at the edges of the radiochromic film was observed to be a function of time during which the film remained in the water. On the other hand, the penetration of water at the edges of the film was found to be independent of irradiation dose.Conclusions EBT3 radiochromic film is found more resistant to water penetration through the edges than its predecessors. However, there is evidence that suggest that liquid water damage the Nylon cover layer of the film by changing its optical properties. Therefore, it is recommended to build a new calibration curve for radiochromic films for a specific situation involving dose measurements in liquid water.

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Evaluation of Gafchromic® EBT3 films characteristics in therapy photon, electron and proton beams

Abstract: The low combined uncertainty observed and low beam and energy-dependence make EBT3 suitable for dosimetry in various applications.

Cited by 189 publications

References 30 publications

Evaluation of lens dose from anterior electron beams: comparison of Pinnacle and Gafchromic EBT3 film

Evaluation of lens dose from anterior electron beams: comparison of Pinnacle and Gafchromic EBT3 film

Karakteristik Dosimetri Film Gafchromic Ebt3 Pada Berkas Elektron Dan Foton

Investigation of EBT3 radiochromic film's response to humidity

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