Gafchromic EBT2 dosimetry via robust optimization

Alves, Victor Gabriel Leandro; Cardoso, Simone C.; Silva, Ademir X. da

doi:10.1016/j.cpc.2013.02.023

Cited by 10 publications

(14 citation statements)

References 10 publications

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“…For leaves 21 and 26-30, an offset to the left is observed. For leaves [12][13][14][15][16], an offset to the right is observed, ranging between 0.5-1 mm. This is in agreement with the dispositions to the left, observed with the EBT2 film, for leaves 26-30 that can now be determined as significant (greater than 1 mm).…”

Section: The Picket Fence Test Results On the Delta 4pt Phantommentioning

confidence: 99%

“…This is in agreement with the dispositions to the left, observed with the EBT2 film, for leaves 26-30 that can now be determined as significant (greater than 1 mm). The offset of leaves [12][13][14][15][16] was not previously observed, probably because of the relatively small dispositions. Fig.…”

Section: The Picket Fence Test Results On the Delta 4pt Phantommentioning

confidence: 99%

“…It has been reported in the literature that radiochromic films, like the EBT2, undergo slight postexposure changes. (16) However, for the dose levels under study, an immediate scanning could have been performed since, the variations in net optical density (OD) between 1 hr and 24 hr after irradiation have been measured to be less than 0.01. (17) However, in order to ensure that the film darkening had stabilized when scanned, the film scanning was performed at 24 hr after the irradiation.…”

Section: E the Picket Fence Test With The Ebt2 Filmsmentioning

confidence: 99%

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MLC positional accuracy evaluation through the Picket Fence test on EBT2 films and a 3D volumetric phantom

Antypas

Floros

Rouchota

et al. 2015

J Applied Clin Med Phys

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The accuracy of MLC positions during radiotherapy is important as even small positional deviations can translate into considerable dose delivery errors. This becomes crucial when radiosensitive organs are located near the treated volume and especially during IMRT, where dose gradients are steep. A test commonly conducted to measure the positional accuracy of the MLCs is the Picket Fence test. In this study two alterations of the Picket Fence test were performed and evaluated, the first one using radiochromic EBT2 films and the second one the Delta4PT diode array phantom and its software. Our results showed that EBT2 films provide a relatively fast, qualitative visual inspection of the significant leaf dispositions. When slight inaccuracies need to be revealed or precise numerical results for each leaf position are needed, Delta4PT provides the desired accuracy of 1 mm. In treatment modalities where a higher accuracy is required in the delivered dose distribution, such as in IMRT, precise numerical values of the measurements for the MLC positional inspection are required.PACS number: 87.55.Qr, 87.56.bd, 87.56.Fc, 87.56.nk

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Section: The Picket Fence Test Results On the Delta 4pt Phantommentioning

confidence: 99%

Section: The Picket Fence Test Results On the Delta 4pt Phantommentioning

confidence: 99%

Section: E the Picket Fence Test With The Ebt2 Filmsmentioning

confidence: 99%

See 1 more Smart Citation

MLC positional accuracy evaluation through the Picket Fence test on EBT2 films and a 3D volumetric phantom

Antypas

Floros

Rouchota

et al. 2015

J Applied Clin Med Phys

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show abstract

“…The image files were processed using custom software developed by Alves et al . (37) that improves on multichannel methods (38) by using robust optimization for dose calculation. Calibration doses for the films were administered using the 10 × 10 mm square collimator nozzle on the SARRP with pieces of EBT3 film sandwiched between two slabs of 5 mm thick tissue equivalent plastic (model no.…”

Section: Methodsmentioning

confidence: 99%

Scattered Dose Calculations and Measurements in a Life-Like Mouse Phantom

et al. 2017

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Anatomically accurate phantoms are useful tools for radiation dosimetry studies. In this work, we demonstrate the construction of a new generation of life-like mouse phantoms in which the methods have been generalized to be applicable to the fabrication of any small animal. The mouse phantoms, with built-in density inhomogeneity, exhibit different scattering behavior dependent on where the radiation is delivered. Computer models of the mouse phantoms and a small animal irradiation platform were devised in Monte Carlo N-Particle code (MCNP). A baseline test replicating the irradiation system in a computational model shows minimal differences from experimental results from 50 Gy down to 0.1 Gy. We observe excellent agreement between scattered dose measurements and simulation results from X-ray irradiations focused at either the lung or the abdomen within our phantoms. This study demonstrates the utility of our mouse phantoms as measurement tools with the goal of using our phantoms to verify complex computational models.

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“…The image files were processed using custom software developed by Alves et al (37) that improves on multichannel methods (38) by using robust optimization for dose calculation. Calibration doses for the films were administered using the 10 3 10 mm square collimator nozzle on the SARRP with pieces of EBT3 film sandwiched between two slabs of 5 mm thick tissue equivalent plastic (model no.…”

Section: Film Dosimetrymentioning

confidence: 99%