Dosimetric characterization of the Exradin W1 plastic scintillator detector through comparison with an in-house developed scintillator system

Beierholm, Anders Ravnsborg; Behrens, C.F.; Andersen, C.E.

doi:10.1016/j.radmeas.2014.08.005

Cited by 45 publications

(40 citation statements)

References 20 publications

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“…The results are compared with those obtained with other detectors we already use for small photon beam dosimetry, contributing to complement data that can be found in the literature, 24,[27][28][29] in particular regarding the behaviour of these detectors in smallfield beam dosimetry required for TPS commissioning (PDD, dose profile and OF measurements).…”

Section: Introductionmentioning

confidence: 85%

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Dosimetric characterization and behaviour in small X-ray fields of a microchamber and a plastic scintillator detector

Pasquino

Cutaia

Radici

et al. 2017

BJR

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Objective: The aim of this work was to investigate the main dosimetric characteristics and the performance of an A26 Exradin ionization microchamber (A26 IC) and a W1 Exradin plastic scintillation detector (W1 PSD) in small photon beam dosimetry for treatment planning system commissioning and quality assurance programme. Methods: Detector characterization measurements (short-term stability, dose linearity, angular dependence and energy dependence) were performed in water for field sizes up to 10 3 10 cm 2 . Polarity effect (P pol ) was examined for the A26 IC. The behaviour of the detectors in small field relative dosimetry [percentage depth dose, dose profiles often called the off-axis ratio and output factors (OFs)] was investigated for field sizes ranging from 1 3 1 to 3 3 3 cm 2 . Results: Results were compared with those obtained with other detectors we already use for small photon beam dosimetry. A26 IC and W1 PSD showed a linear dose response. While the A26 IC showed no energy dependence, the W1 PSD showed energy dependence within 2%; no angular dependence was registered. P pol values for A26 IC were below 0.9% (0.5% for field size .2 3 2 cm 2 ). A26 IC and W1 PSD depth-dose curves and lateral profiles agreed with those obtained with an EDGE diode. No differences were observed among the detectors in OF measurement for field sizes larger than 1 3 1 cm 2 , with average differences ,1%. For field sizes ,1 3 1 cm 2 , the effective volume of ionization chamber and non-water equivalence of EDGE diode become significant. A26 IC OF values were significantly lower than EDGE diode and W1 PSD values, with percentage differences of about 223 and 213% for the smallest field, respectively. W1 PSD OF values lay between ion chambers and diode values, with a maximum percentage difference of about 210% with respect to the EDGE diode, for a 6 3 6-mm 2 field size. Conclusion: The results of our investigation confirm that A26 IC and W1 PSD could play an important role in small field relative dosimetry. Advances in knowledge: Dosimetric characteristics of Exradin A26 ionization microchamber and W1 plastic scintillation detector for small field dosimetry.

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Section: Introductionmentioning

confidence: 85%

“…27,28,42 We did not take into account detector energy and temperature dependence, which would allow achieving uncertainties lower than those found.…”

Section: 4mentioning

confidence: 99%

Dosimetric characterization and behaviour in small X-ray fields of a microchamber and a plastic scintillator detector

Pasquino

Cutaia

Radici

et al. 2017

BJR

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“…(a)]. Other studies have shown the dose rate to have an insignificant effect on the response of the Exradin W1 detector, which leaves changes in the measured spectral shape as the likely cause of the CLR trends. However, it is difficult to quantify these changes as the photodetector used in the R&D W1 only measures the spectral intensity in two broad spectral regions.…”

Section: Discussionmentioning

confidence: 99%

Characterization of spectral and intensity changes with measurement geometry in various light guides used in scintillation dosimetry

Simiele

DeWerd

2018

Medical Physics

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The insignificant change in the CLR with delivered dose indicates that a single CLR value over the investigated dose range is sufficient for accurate Čerenkov subtraction. Variations in the stem-effect spectrum shape can occur with changes in irradiation geometry. The magnitude of the changes are governed by the fiber construction and the optical properties of the fiber. The observed spectral shape changes can be explained by a combination of variations in optical path length through the fiber and the fiber fluorescent signal contribution to the stem-effect. These spectral shape variations directly influence the calculated CLR values. This work confirms that careful characterization of scintillation detectors is important as changes in the stem-effect spectrum can cause changes in the CLR. If the CLR changes between the reference and measurement conditions, this could result in an incorrect stem-effect subtraction and reduced measurement accuracy.

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“…It is worth noting that the Exradin W1 proved to be a reliable tool for small field dosimetry applications such as RT beams commissioning and quality checks 1,29,30) thanks to its water-equivalence. However, the approach adopted for stem effect correction is very sensitive to the irradiation set up [31][32][33][34] .…”

Section: Resultsmentioning

confidence: 99%

Characterization of Yb-doped silica optical fiber as real-time dosimeter

Veronese

Chiodini

Cialdi

et al. 2017

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

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The near-infrared radioluminescence and dosimetric properties of Yb-doped silica optical fibers, coupled with an optical detector prototype based on an avalanche photo-diode, were studied by irradiating the fibers with clinical beams generated by a Varian Trilogy accelerator. The performances of the system in standard and small field sizes have been also investigated comparing the output factor, percent depth dose and off axis ratio measurements of the prototypal dosimetric system with other commercial sensors.The results demonstrated that the drawback due to the stem effect in Yb-doped silica optical fibers can be managed in a simple but effective way by optical filtering. These features, together with the accuracy and precision achieved by Ybdoped fibers in relative dose assessments make the device promising for in-vivo dosimetry studies in radiation therapy.

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Dosimetric characterization of the Exradin W1 plastic scintillator detector through comparison with an in-house developed scintillator system

Cited by 45 publications

References 20 publications

Dosimetric characterization and behaviour in small X-ray fields of a microchamber and a plastic scintillator detector

Dosimetric characterization and behaviour in small X-ray fields of a microchamber and a plastic scintillator detector

Characterization of spectral and intensity changes with measurement geometry in various light guides used in scintillation dosimetry

Characterization of Yb-doped silica optical fiber as real-time dosimeter

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