Radiotherapy dosimetry using a commercial OSL system

Viamonte, A.; Rosa, L.A.R. da; Buckley, Lesley; Cherpak, Amanda; Cygler, Joanna

doi:10.1118/1.2841940

Cited by 129 publications

(122 citation statements)

References 23 publications

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“…Measurements were not converted to absolute dose considering the other correction factors that have inherent uncertainties; e.g., energy dependence, absolute reader sensitivity, etc. [12][13][14][15] Inclusion of this would introduce unnecessary uncertainty that this study did not attempt to address; however, a facility using an OSL system would need to characterize these basic factors to reduce uncertainty in converting the OSLD measurement to an absorbed dose.…”

Section: Discussionmentioning

confidence: 99%

“…This method differs from other work using just one sensitivity factor for a given dosimeter batch. 15 Sensitivity of the dosimeter has been shown not to change significantly at cumulative doses below 10 Gy. 11,12,19 Even so, the experiments were performed in such a way as to keep the cumulative dose as even as possible amongst the dosimeters to eliminate such uncertainties.…”

Section: Iia Dosimeter and Readout Systemmentioning

confidence: 99%

“…1, [12][13][14][15] While the basic features of OSL dosimetry using aluminum oxide have been investigated, there are still unanswered questions about the performance of commercial OSLDs in a clinical environment. This study is aimed at determining whether there is any angular dependence of the response of the aluminum oxide-based nanoDot.…”

Section: Introductionmentioning

confidence: 99%

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Angular dependence of the nanoDot OSL dosimeter

et al. 2011

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Purpose: Optically stimulated luminescent detectors (OSLDs) are quickly gaining popularity as passive dosimeters, with applications in medicine for linac output calibration verification, brachytherapy source verification, treatment plan quality assurance, and clinical dose measurements. With such wide applications, these dosimeters must be characterized for numerous factors affecting their response. The most abundant commercial OSLD is the InLight/OSL system from Landauer, Inc. The purpose of this study was to examine the angular dependence of the nanoDot dosimeter, which is part of the InLight system. Methods: Relative dosimeter response data were taken at several angles in 6 and 18 MV photon beams, as well as a clinical proton beam. These measurements were done within a phantom at a depth beyond the build-up region. To verify the observed angular dependence, additional measurements were conducted as well as Monte Carlo simulations in MCNPX. Results: When irradiated with the incident photon beams parallel to the plane of the dosimeter, the nanoDot response was 4% lower at 6 MV and 3% lower at 18 MV than the response when irradiated with the incident beam normal to the plane of the dosimeter. Monte Carlo simulations at 6 MV showed similar results to the experimental values. Examination of the results in Monte Carlo suggests the cause as partial volume irradiation. In a clinical proton beam, no angular dependence was found. Conclusions: A nontrivial angular response of this OSLD was observed in photon beams. This factor may need to be accounted for when evaluating doses from photon beams incident from a variety of directions.

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Section: Discussionmentioning

confidence: 99%

Section: Iia Dosimeter and Readout Systemmentioning

confidence: 99%

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Angular dependence of the nanoDot OSL dosimeter

et al. 2011

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“…This result may be compared with other uncertainties obtained in similar conditions (i.e. multiple use of a single detector): +0.7% (4) ; +0.6% (3) ; +0.5% (7) at 1 Gy; +2.5% (5) at 0.5 Gy. The OSL sensor, PMMA tube and water phantom have been modelled with the MCNP5 code (MonteCarlo N-Particles, Los Alamos National Laboratory, NM, USA).…”

Section: Depth -Dose Measurementsmentioning

confidence: 81%

Multichannel dosemeter and Al2O3:C optically stimulated luminescence fibre sensors for use in radiation therapy: evaluation with electron beams

Magne

Auger

Bordy

et al. 2008

Radiation Protection Dosimetry

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To cite this version:Sylvain Magne, J. Bordy, L. This article proposes an innovative multichannel optically stimulated luminescence (OSL) dosemeter for on-line in vivo dose verification in radiation therapy. OSL fibre sensors incorporating small Al 2 O 3 :C fibre crystals (TLD 500 ) have been tested with an X-ray generator. A reproducible readout procedure should reduce the fading-induced uncertainty ( 2 1% per decade). OSL readouts are temperature-dependent [0.3% K 21 when OSL stimulation is performed at the same temperature as irradiation; 0.16% K 21 after thermalisation (208 8 8 8 8C)]. Sensor calibration and depth-dose measurements with electron beams have been performed with a Saturne 43 linear accelerator in reference conditions at CEA-LNHB (ionising radiation reference laboratory in France). Predosed OSL sensors show a good repeatability in multichannel operation and independence versus electron energy in the range (9, 18 MeV). The difference between absorbed doses measured by OSL and an ionisation chamber were within + + + + +0.9% (for a dose of about 1 Gy) despite a sublinear calibration curve.

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“…Thus, it is possible to reuse it easily and quickly. 16,17) 2. Calibrating an optically stimulated luminescence dosimeter …”

Section: Properties Of the Optically Stimulated Luminescence Dosimetermentioning

confidence: 99%

Evaluations and Comparisons of Body Surface Doses during Breast Cancer Treatment by Tomotherapy and LINAC Radiotherapy Devices

et al. 2017

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Effects on skin caused by the dose from linear accelerator (LINAC) opposing portal irradiation and TomoDirect 3-D modeling treatment according to the radiation devices and treatment methods were measured, and a comparative analysis was performed. Two groups of 10 patients each were created and measurements were carried out using an optically stimulated luminescence dosimeter. These patients were already receiving radiation treatment in the hospital. Using the SPSS statistical program, the minimum and maximum average standard deviations of the measured skin dose data were obtained. Two types of treatment method were selected as independent variables; the measured points and total average were the dependent variables. An independent sample T-test was used, and it was checked whether there was a significance probability between the two groups. The average of the measured results for the LINAC opposing portal radiation was 117.7 cGy and PDD 65.39% for the inner breast, 144.7 cGy and PDD 80.39% for the outer breast, 143.2 cGy and PDD 79.56% for the upper breast, 151.4 cGy and PDD 84.11% for the lower breast, 149.6 cGy and PDD 83.11% for the axilla, and 141.32 cGy and PDD 78.51% for the total average. In contrast, for TomoDirect 3-D conformal radiotherapy, the corresponding measurement values were 137.6 cGy and PDD 76.44%, 152.3 cGy and PDD 84.61%, 148.6 cGy and PDD 82.56%, 159.7 cGy and PDD 88.72%, and 148.6 cGy PDD 82.56%, respectively, and the total average was 149.36 cGy and PDD 82.98%. To determine if the difference between the total averages was statistically significant, the independent sample T-test of the SPSS statistical program was used, which indicated that the P-value was P=0.024, which was 0.05 lower than the significance level. Thus, it can be understood that the null hypothesis can be dismissed, and that there was a difference in the averages. In conclusion, even though the treatment dose was similar, there could be a difference in the dose entering the body surface from the radiation treatment plan; however, depending on the properties of the treatment devices, there is a difference in the dose affecting the body surface. Thus, the absorbed dose entering the body surface can be high. During breast cancer radiotherapy, radiation dermatitis occurs in almost all patients. Most patients have a difficult time while undergoing treatment, and therefore, when choosing a radiotherapy treatment method, minimizing radiation dermatitis is an important consideration. classification of side-effect levels, of a total of 284 patients, 207 patients had 0th and 1st stage minor radiation dermatitis, and 77 patients had 2nd or greater stage serious radiation dermatitis. Keywords9) The main symptom of radiation dermatitis is red spots, and oily or dry skin accompanied by severe itching and pain in a portion of the patients. 10,11)The reason why each patient has different degrees of symptoms, from the patient perspective, is the cancer size or skin type and the degree of skin moisture; when looking at it from the treatment...

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Radiotherapy dosimetry using a commercial OSL system

Cited by 129 publications

References 23 publications

Angular dependence of the nanoDot OSL dosimeter

Angular dependence of the nanoDot OSL dosimeter

Multichannel dosemeter and Al2O3:C optically stimulated luminescence fibre sensors for use in radiation therapy: evaluation with electron beams

Evaluations and Comparisons of Body Surface Doses during Breast Cancer Treatment by Tomotherapy and LINAC Radiotherapy Devices

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