Calibrating page sized Gafchromic EBT3 films

Crijns, Wouter; Maes, Frederik; Heide, Uulke A. van der; Heuvel, Frank Van den

doi:10.1118/1.4771960

Cited by 58 publications

(65 citation statements)

References 30 publications

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“…The red pixels are the pixels with a gamma‐index ≥1, nearly all of which are located within the central high dose region. The failing of these pixels is attributed to the local dose differences due to residual noise in the film measurements 14. When taking into account only the pixels relevant for the current proof of concept study, that is, the (10%–80%) dose region marked by the black‐dashed lines in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Using these aperture cut‐outs, the clinical plan was delivered onto a polystyrene slab phantom (RW3, PTW, Freiburg, Germany) using twice the amount of monitor units, with radiochromic film (type Gafchromic EBT3, Ashland Advanced Materials, Bridgewater, NJ, USA) positioned perpendicular to the beam axis at a clinically relevant depth of 2 cm. Calibration and processing of the films was performed as described elsewhere 14. The gamma‐index agreement score 15, 16 between both delivered fields was calculated using 1.0% (local) dose‐difference and 1.0 mm distance‐to‐agreement acceptance criteria.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Production of patient‐specific electron beam aperture cut‐outs using a low‐cost, multi‐purpose 3D printer

Michiels

Mangelschots

Roover

et al. 2018

J Applied Clin Med Phys

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Electron beam collimators for non‐standard field sizes and shapes are typically fabricated using Styrofoam molds to cast the aperture cut‐out. These molds are often produced using a dedicated foam cutter, which may be expensive and only serves a single purpose. An increasing number of radiotherapy departments, however, has a 3D printer on‐site, to create a wide range of custom‐made treatment auxiliaries, such as bolus and dosimetry phantoms. The 3D printer can also be used to produce patient‐specific aperture cut‐outs, as elaborated in this note. Open‐source programming language was used to automatically generate the mold's shape in a generic digital file format readable by 3D printer software. The geometric mold model has the patient's identification number integrated and is to be mounted on a uniquely fitting, reusable positioning device, which can be 3D printed as well. This assembly likewise fits uniquely onto the applicator tray, ensuring correct and error‐free alignment of the mold during casting of the aperture. For dosimetric verification, two aperture cut‐outs were cast, one using a conventionally cut Styrofoam mold and one using a 3D printed mold. Using these cut‐outs, the clinical plan was delivered onto a phantom, for which the transversal dose distributions were measured at 2 cm depth using radiochromic film and compared using gamma‐index analysis. An agreement score of 99.9% between the measured 2D dose distributions was found in the (10%–80%) dose region, using 1% (local) dose‐difference and 1.0 mm distance‐to‐agreement acceptance criteria. The workflow using 3D printing has been clinically implemented and is in routine use at the author's institute for all patient‐specific electron beam aperture cut‐outs. It allows for a standardized, cost‐effective, and operator‐friendly workflow without the need for dedicated equipment. In addition, it offers possibilities to increase safety and quality of the process including patient identification and methods for accurate mold alignment.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Production of patient‐specific electron beam aperture cut‐outs using a low‐cost, multi‐purpose 3D printer

Michiels

Mangelschots

Roover

et al. 2018

J Applied Clin Med Phys

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“…Recent publications proposed elegant solutions to this limitation, for example Girard et al [13] and Crijns et al [17]. These kinds of investigations are outside the scope of this work, since our purpose is to report about our experience with commercially available software and "plug and play" solution.…”

Section: Discussionmentioning

confidence: 99%

Gafchromic film dosimetry: Four years experience using FilmQA Pro software and Epson flatbed scanners

2014

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a b s t r a c tPurpose: s: To assess performance of FilmQA Pro software for pre-treatment patient-specific quality assurance (QA), using radiochromic films and two commercial flatbed scanners. To evaluate a novel multichannel approach compared to the classical red channel evaluation. Material and methods: Patient films (mostly EBT2 films, one box of EBT3) were digitalized using successively two flatbed scanners: the A4-size Epson V750 and the A3-size Epson 10000XL. Prior to patient dose verification, basic characteristics of films and scanners were investigated. Patient films were analyzed using FilmQA Pro software, which enables to use the signal from all three colour channels (Red, Green, Blue). Results: Compared to the red channel evaluation, multichannel evaluation presents better passing rates with regard to local gamma index. As expected, we obtained better results using A3-size scanner compared to A4-size scanner, especially when considering large region of interest. An observation of great interest was made for both scanners: after intensive use, a tilting in the blue transmittance profiles appeared in the lamp direction, making multichannel analysis unsuitable for accurate dose evaluation.

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“…Hal ini karena puncak spektra film EBT3 berada dalam rentang 630-700 nm, sehingga hasil pemindaian paling optimal didapatkan dengan Red channel, sedangkan Blue channelmemiliki nilai yang paling rendah. Hal ini mengindifikasi bahwaBlue channelterjadi efek pertubansi yang meningkatkan noise pada film digital sehingga tidak cocok sebagai parameter dalam menentukan pengaruh respon dosis, hasil ini sesuai dengan penelitian Sipilä (2016) [5], [15]. Dalam upaya mengatahui karakteristik film EBT3, dilakukan beberapa perlakuaan ketika pemindaian dengan menggunakan scanner Epson V700.…”

Section: Dosis Serap Pada Setiap Channelunclassified

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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Calibrating page sized Gafchromic EBT3 films

Cited by 58 publications

References 30 publications

Production of patient‐specific electron beam aperture cut‐outs using a low‐cost, multi‐purpose 3D printer

Production of patient‐specific electron beam aperture cut‐outs using a low‐cost, multi‐purpose 3D printer

Gafchromic film dosimetry: Four years experience using FilmQA Pro software and Epson flatbed scanners

Karakteristik Dosimetri Film Gafchromic Ebt3 Pada Berkas Elektron Dan Foton

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