Dosimetric comparison between XR-RV3 and EBT2 radiochromic film in megavoltage photon beams

Setilo, I.; Plessis, F.C.P. du

doi:10.18869/acadpub.ijrr.14.2.149

Cited by 3 publications

(7 citation statements)

References 13 publications

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“…The calibration curve performed by gradual exposure to irradiated dose, then measurement of optical density (OD) for each absolute dose, this curve was transferred to VeriSoft software and saved as a calibration curve. That will then transfer the measured map into absolute dose and map of fluence for each individual patient (18) .…”

Section: Iv-beam Fluence and Matched Map With Different Dosimeters Patient-specific Qa Ebt2 Gafchromic Filmmentioning

confidence: 99%

Dose verification and plan conformity with three different dosimeters for intensity-modulated radiation therapy plans

Yassin

Elshahat

Attlah³

et al. 2021

Int J Radiat Res

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Background:The intensity-modulated radiotherapy (IMRT) enables personalized treatment; the complexity of this technique increased the need for patient-specific quality assurance (QA). Objective: Comparing three dosimeters that common for patient-specific QA of IMRT. Material and Method: cases were planned at Eclipse treatment planning system (TPS) to receive radiotherapy at Unique VARIAN linear accelerator LINAC; Patient-specific QA was performed with three independent dosimeters: Gafchromic films EPT2, Electronic Portal Image Device (EPID), and PTW 2D array. The absolute dose was measured and analysis of 2D gamma index was performed, then compared with the plan calculated in TPS. Results: Analysis of absolute dose measured have highest difference from dose in Gafchromic film (89.1±4) % while EPID had a lower range (96.6 ± 1.2) and 2Darray showed an agreement up to (99±1.2) for patient specific QA both EBT2 and EPID enable to compare the measured map with TPS calculations, for plan conformity the gafchromic film enable measurement with lower accuracy even with localized brain tumor, the heterogeneity in lung case slightly affect the EPID measurement, this found also with irregular surface of head and neck and increased depth within pelvic case examine. Measurement with 2D array found to be the optimum dosimeter within different conditions. Conclusion: different parameters might affect the accuracy of gafchromic film including film scanning, storing, and calibration curve. EPID has an average deviation appears in beam fluence and 2D array as a 2D ion chamber found to have the most accurate dosimeter, but still time consuming when compared to EPID.

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Section: Iv-beam Fluence and Matched Map With Different Dosimeters Patient-specific Qa Ebt2 Gafchromic Filmmentioning

confidence: 99%

Dose verification and plan conformity with three different dosimeters for intensity-modulated radiation therapy plans

Yassin

Elshahat

Attlah³

et al. 2021

Int J Radiat Res

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“…These films consist of four layers: a yellow/orange polyester layer (97 µm), an adhesive layer made of acrylic (20 µm), an active layer (17 µm), and a white polyester layer (97 µm). 19 The layer sensitive (active) to the ionizing radiation is lithium salt of pentacosa-10,12-diynoic acid (LiPDCA). 19 XR-RV3 Gafchromic films are tissue-equivalent dosimetric systems, because the effective Z of all of these layers is approximately 7.3.…”

Section: Xr-rv3 Gafchromic Filmsmentioning

confidence: 99%

“…19 The layer sensitive (active) to the ionizing radiation is lithium salt of pentacosa-10,12-diynoic acid (LiPDCA). 19 XR-RV3 Gafchromic films are tissue-equivalent dosimetric systems, because the effective Z of all of these layers is approximately 7.3. 20 As a result of ionizing radiation interaction, free radicals are formed, which undergo stabilizing polymerization at least 24 hours after exposure.…”

Section: Xr-rv3 Gafchromic Filmsmentioning

confidence: 99%

“…20 As a result of ionizing radiation interaction, free radicals are formed, which undergo stabilizing polymerization at least 24 hours after exposure. 19 According to the information obtained from the film manufacturer, the polymerization process begins within 100 µs from the end of the exposure. Below 100 Gy, polymerization progresses as a rapid (within about 30 ms) firstdegree reaction, which transforms within a second into the slow phase, in which the changes in optical density are proportional to the logarithm of time after exposure.…”

Section: Xr-rv3 Gafchromic Filmsmentioning

confidence: 99%

“…Gafchromic film processing was carried out in accordance with the literature recommendations using a commercially available office flatbed scanner. 4,19 The scanner quality was checked by determining the heterogeneity and repeatability of the short-and long-term reading (as recommended in reference 3 ). A selected sample of calibration films (irradiated with a dose of approximately 1 Gy) was used for all these tests.…”

Section: Quality Control Of the Flatbed Scannermentioning

confidence: 99%

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Calibration of Gafchromic XR-RV3 film under interventional radiology conditions

Kidoń

Polaczek-Grelik

Gołba

et al. 2021

Polish Journal of Medical Physics and Engineering

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Introduction: The purpose of the study was the calibration of Gafchromic films in clinical interventional radiology conditions and the assessment of the influence of dose range, the shape of the fitting curve, and its practical application. The aim of the work was to show how practically perform calibration in a wide range of doses. Material and methods: Gafchromic XR–RV3 films were included in the study. The calibration was performed for A and B film series separately. Doses from the range of 0 – 8 Gy were used. Film dosimeters were read out in reflective mode with a commercial flatbed scanner. Results: Among various degrees of a polynomial function, the best fit, which fulfilled the chosen criterion of 95% agreement between measured and reconstructed doses and simple equation criterion, was observed for third-degree polynomial. The fitting curve where the dose is the function of optical density (logMPV) was demonstrated to be more precise than the fitting curve based on MPV only. To minimize the difference between dose absorbed by the film and dose reconstructed from the fitting curve below 5% it is necessary to divide the calibration range of 0 – 8 Gy into two subranges for use in interventional radiology. This difference was set at a maximum level of 3.8% and 1.9% for the lowand high-dose range, respectively. Each series of films may have a slightly different calibration curve, especially for the low dose range. A deviation of up to 36% between two batches of Gafchromic film was observed. Conclusions: For the third-degree polynomial fitting function (one of the recommended in the literature) calibration should be done into low and high dose ranges and for each batch separately. A systematic error higher than 20% could be introduced when the fitting curve from one film batch is applied to the other film batch.

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