SU-E-T-81: Development and Implementation of a Remote Audit Tool for High Dose Rate (HDR) Ir-192 Brachytherapy Using Optically Stimulated Luminescence Dosimetry

Casey, Kevin E.; Alvarez, P.; Lawyer, Ann A.; Kry, Stephen F.; Howell, Rebecca M.; Davidson, Scott; Followill, David S

doi:10.1118/1.4735138

Cited by 3 publications

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“…Tedgren and Grindborg (2008) audited source strength using a well-chamber at 14 centres in Sweden. More recently, Casey et al (2012) has developed a remote audit tool in USA using optically stimulated luminescence dosimetry to measure dose at two points from a single straight catheter, and Haworth et al (2009Haworth et al ( , 2013 has completed a pilot audit in seven Australian centres using TLD to measure dose at a single point from six dwell positions uniformly distributed in three straight catheters. There is also a UK audit of well chamber consistency being conducted during 2012-13 by Lee et al 2013, Clatterbridge Cancer Centre (as yet unpublished) and there have been audits using TLD around clinical applicators conducted by the Midlands Audit Group in UK (unpublished).…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of a film dosimetry audit tool for comparison of planned and delivered dose distributions in high dose rate (HDR) brachytherapy

et al. 2013

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A novel phantom is presented for 'full system' dosimetric audit comparing planned and delivered dose distributions in HDR gynaecological brachytherapy, using clinical treatment applicators. The brachytherapy applicator dosimetry test object consists of a near full-scatter water tank with applicator and film supports constructed of Solid Water, accommodating any typical cervix applicator. Film dosimeters are precisely held in four orthogonal planes bisecting the intrauterine tube, sampling dose distributions in the high risk clinical target volume, points A and B, bladder, rectum and sigmoid. The applicator position is fixed prior to CT scanning and through treatment planning and irradiation. The CT data is acquired with the applicator in a near clinical orientation to include applicator reconstruction in the system test. Gamma analysis is used to compare treatment planning system exported RTDose grid with measured multi-channel film dose maps. Results from two pilot audits are presented, using Ir-192 and Co-60 HDR sources, with a mean gamma passing rate of 98.6% using criteria of 3% local normalization and 3 mm distance to agreement (DTA). The mean DTA between prescribed dose and measured film dose at point A was 1.2 mm. The phantom was funded by IPEM and will be used for a UK national brachytherapy dosimetry audit.

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Section: Introductionmentioning

confidence: 99%

Design and implementation of a film dosimetry audit tool for comparison of planned and delivered dose distributions in high dose rate (HDR) brachytherapy

et al. 2013

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Sensitivity and stability of optically stimulated luminescence dosimeters with filled deep electron/hole traps under pre-irradiation and bleaching conditions

Park¹,

Choi

Park³

et al. 2017

Physica Medica

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Time-resolved optically stimulated luminescence of Al₂O₃:C for ion beam therapy dosimetry

et al. 2015

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The objective of this study was to characterize the time-resolved (TR) optically stimulated luminescence (OSL) from Al2O3:C detectors and investigate methodologies to improve the accuracy of these detectors in ion beam therapy dosimetry, addressing the reduction in relative response to high linear energy transfer (LET) particles common to solid-state detectors. Al2O3:C OSL detectors (OSLDs) were exposed to proton, (4)He, (12)C and (16)O beams in 22 particle/energy combinations and read using a custom-built TR-OSL reader. The OSL response rOSL, relative to (60)Co gamma dose to water, and the ratio between the UV and blue OSL emission bands of Al2O3:C (UV/blue ratio) were determined as a function of the LET. Monte-Carlo simulations with the multi-purpose interaction and transport code FLUKA were used to estimate the absorbed doses and particle energy spectra in the different irradiation conditions. The OSL responses rOSL varied from 0.980 (0.73 keV μm(-1)) to 0.288 (120.8 keV μm(-1)). The OSL UV/blue ratio varied by a factor of two in the investigated LET range, but the variation for (12)C beams was only 11%. OSLDs were also irradiated at different depths of carbon ion spread-out Bragg peaks (SOBPs), where it was shown that doses could be obtained with an accuracy of ± 2.0% at the entrance channel and within the SOBP using correction factors calculated based on the OSL responses obtained in this study. The UV/blue ratio did not allow accurate estimation of the dose-averaged LET for (12)C SOBPs, although the values obtained can be explained with the data obtained in this study and the additional information provided by the Monte-Carlo simulations. The results demonstrate that accurate OSLD dosimetry can be performed in ion beam therapy using appropriate corrections for the OSL response.

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SU-E-T-81: Development and Implementation of a Remote Audit Tool for High Dose Rate (HDR) Ir-192 Brachytherapy Using Optically Stimulated Luminescence Dosimetry

Cited by 3 publications

References 0 publications

Design and implementation of a film dosimetry audit tool for comparison of planned and delivered dose distributions in high dose rate (HDR) brachytherapy

Design and implementation of a film dosimetry audit tool for comparison of planned and delivered dose distributions in high dose rate (HDR) brachytherapy

Sensitivity and stability of optically stimulated luminescence dosimeters with filled deep electron/hole traps under pre-irradiation and bleaching conditions

Time-resolved optically stimulated luminescence of Al₂O₃:C for ion beam therapy dosimetry

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SU-E-T-81: Development and Implementation of a Remote Audit Tool for High Dose Rate (HDR) Ir-192 Brachytherapy Using Optically Stimulated Luminescence Dosimetry

Cited by 3 publications

References 0 publications

Design and implementation of a film dosimetry audit tool for comparison of planned and delivered dose distributions in high dose rate (HDR) brachytherapy

Design and implementation of a film dosimetry audit tool for comparison of planned and delivered dose distributions in high dose rate (HDR) brachytherapy

Sensitivity and stability of optically stimulated luminescence dosimeters with filled deep electron/hole traps under pre-irradiation and bleaching conditions

Time-resolved optically stimulated luminescence of Al2O3:C for ion beam therapy dosimetry

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Time-resolved optically stimulated luminescence of Al₂O₃:C for ion beam therapy dosimetry