Relative dosimetrical verification in high dose rate brachytherapy using two-dimensional detector array IMatriXX

Manikandan, A.; Sarkar, Biplab; David, Perianayagam A; Holla, Raghavendra; Vivek, T R; Sujatha, N. V.

doi:10.4103/0971-6203.83491

Cited by 19 publications

(25 citation statements)

References 10 publications

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“…The measured dwell position deviations of our systems are comparable with those from systems based on silicon diode and IC array. 18,31,34 The dwell time deviations are also comparable with those from systems based on silicon diode. 18,31 In terms of functionality, our systems allow not only dwell position and time verification but also source activity monitoring for HDR-BT QA (and in vivo QC with the instrumented applicator).…”

Section: F Comparison With Literaturesupporting

confidence: 58%

Design and testing of a phantom and instrumented gynecological applicator based on GaN dosimeter for use in high dose rate brachytherapy quality assurance

et al. 2016

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Section: F Comparison With Literaturesupporting

confidence: 58%

Design and testing of a phantom and instrumented gynecological applicator based on GaN dosimeter for use in high dose rate brachytherapy quality assurance

et al. 2016

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“…6 There have been efforts found within the literature to develop a method for verification of planned dwelling and timing patterns before and during treatment. These include pinhole imaging, 7,8 diamond detectors, 9 flat panel 10 and EPIDs, 11 film and photodiodes, 12 ion chamber arrays, 13 and video cameras. 28 These devices, while capable of source tracking, can be costly and are limited in their ability to perform a quick, comprehensive, and automated analysis of a full treatment plan.…”

Section: Introductionmentioning

confidence: 99%

“…These include pinhole imaging 7, 8 , diamond detectors 9 , flat panel 10 and EPIDs 11 , film and photodiodes 12 , ion chamber arrays 13 and video cameras * .…”

Section: Introductionmentioning

confidence: 99%

The evaluation of a 2D diode array in “magic phantom” for use in high dose rate brachytherapy pretreatment quality assurance

et al. 2015

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. (2015). The evaluation of a 2D diode array in "magic phantom" for use in high dose rate brachytherapy pretreatment quality assurance. Medical Physics, 42 (2), 663-673.The evaluation of a 2D diode array in "magic phantom" for use in high dose rate brachytherapy pretreatment quality assurance Abstract Purpose: High dose rate (HDR) brachytherapy is a treatment method that is used increasingly worldwide. The development of a sound quality assurance program for the verification of treatment deliveries can be challenging due to the high source activity utilized and the need for precise measurements of dwell positions and times. This paper describes the application of a novel phantom, based on a 2D 11 x 11 diode array detection system, named "magic phantom" (MPh), to accurately measure plan dwell positions and times, compare them directly to the treatment plan, determine errors in treatment delivery, and calculate absorbed dose. Methods: The magic phantom system was CT scanned and a 20 catheter plan was generated to simulate a nonspecific treatment scenario. This plan was delivered to the MPh and, using a custom developed software suite, the dwell positions and times were measured and compared to the plan. The original plan was also modified, with changes not disclosed to the primary authors, and measured again using the device and software to determine the modifications. A new metric, the "position-time gamma index," was developed to quantify the quality of a treatment delivery when compared to the treatment plan. The MPh was evaluated to determine the minimum measurable dwell time and step size. The incorporation of the TG-43U1 formalism directly into the software allows for dose calculations to be made based on the measured plan. The estimated dose distributions calculated by the software were compared to the treatment plan and to calibrated EBT3 film, using the 2D gamma analysis method. Results: For the original plan, the magic phantom system was capable of measuring all dwell points and dwell times and the majority were found to be within 0.93 mm and 0.25 s, respectively, from the plan. By measuring the altered plan and comparing it to the unmodified treatment plan, the use of the position-time gamma index showed that all modifications made could be readily detected. The MPh was able to measure dwell times down to 0.067 ± 0.001 s and planned dwell positions separated by 1 mm. The dose calculation carried out by the MPh software was found to be in agreement with values calculated by the treatment planning system within 0.75%. Using the 2D gamma index, the dose map of the MPh plane and measured EBT3 were found to have a pass rate of over 95% when compared to the original plan. Conclusions: The application of this magic phantom quality assurance system to HDR brachytherapy has demonstrated promising ability to perform the verification of treatment plans, based upon the measured dwell positions and times. The introduction of the quantitative position-time gamma index allows for direct comparison of measured paramete...

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“…In this respect, Manikandan et al used commercial ion chamber arrays to measure the dose distribution 29 . However, in their study, the spatial resolution was limited to the 0.76-cm pitch of the detectors.…”

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confidence: 99%

Imaging Cherenkov emission for quality assurance of high-dose-rate brachytherapy

Yogo

Matsushita

Tatsuno

et al. 2020

Sci Rep

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With advances in high-dose-rate (HDR) brachytherapy, the importance of quality assurance (QA) is increasing to ensure safe delivery of the treatment by measuring dose distribution and positioning the source with much closer intervals for highly active sources. However, conventional QA is timeconsuming, involving the use of several different measurement tools. Here, we developed simple QA method for HDR brachytherapy based on the imaging of Cherenkov emission and evaluated its performance. Light emission from pure water irradiated by an 192 ir γ-ray source was captured using a charge-coupled device camera. Monte carlo calculations showed that the observed light was primarily cherenkov emissions produced by compton-scattered electrons from the γ-rays. the uncorrected Cherenkov light distribution, which was 5% on average except near the source (within 7 mm from the centre), agreed with the dose distribution calculated using the treatment planning system. The accuracy was attributed to isotropic radiation and short-range compton electrons. the source positional interval, as measured from the light images, was comparable to the expected intervals, yielding spatial resolution similar to that permitted by conventional film measurements. The method should be highly suitable for quick and easy QA investigations of HDR brachytherapy as it allows simultaneous measurements of dose distribution, source strength, and source position using a single image.

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Relative dosimetrical verification in high dose rate brachytherapy using two-dimensional detector array IMatriXX

Cited by 19 publications

References 10 publications

Design and testing of a phantom and instrumented gynecological applicator based on GaN dosimeter for use in high dose rate brachytherapy quality assurance

Design and testing of a phantom and instrumented gynecological applicator based on GaN dosimeter for use in high dose rate brachytherapy quality assurance

The evaluation of a 2D diode array in “magic phantom” for use in high dose rate brachytherapy pretreatment quality assurance

Imaging Cherenkov emission for quality assurance of high-dose-rate brachytherapy

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