Dosimetry systems based on Gallium Nitride probe for radiotherapy, brachytherapy and interventional radiology

Pittet, Patrick; Jalade, P.; Balosso, Jacques; Gindraux, L.; Guiral, Pierrick; Wang, R.; Chaikh, Abdulhamid; Gaudu, A.; Ribouton, J.; Rousseau, Julia; Galvan, Jean‐Marc; Rivoire, A.; Giraud, Jean-Yves; Lu, Guo‐Neng

doi:10.1016/j.irbm.2015.01.008

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…Both systems make use of GaN based dosimeters that have been recently suggested for dosimetry on external beam radiotherapy and HDR-BT. 19,20 The present studies show (i) the design of both systems in addition to the implementation of a new method for dwell position determination and (ii) the testing of the proposed systems in clinical HDR-BT conditions at University Hospital of Lyon (Centre Hospitalier Lyon Sud-Hospices Civil de Lyon, France).…”

Section: Introductionmentioning

confidence: 86%

“…Furthermore, previous studies have shown little angular dependence of the GaN dosimeter's response: variations remain lower than ±2% for azimuth angle and lower than ±1.5% for polar angle over the range (−90 • , +150 • ). 20 However, for the systems proposed in this paper, it is not necessary to implement energydependence and angular-dependence compensation, because the GaN dosimeter's response versus axial distance was used as reference for determining dwell position.…”

Section: A Dependencymentioning

confidence: 99%

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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: Introductionmentioning

confidence: 86%

Section: A Dependencymentioning

confidence: 99%

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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“…The differences in position may be due to the accuracy of the MPh system in determining the source position but could also be due to possible shifts in the dwell position from slight variations in the individual transfer tube length, and the reported effect of the flexing of these transfer tubes [18,19]. While the effects of the curvature of the transfer tube were not evaluated in this study, the measurements were set to replicate a clinical delivery, with the phantom placed on the treatment couch at an appropriate height and distance from the afterloader.…”

Section: Accelerated Plan Verificationmentioning

confidence: 99%

Pretreatment verification of high dose rate brachytherapy plans using the ‘magic phantom’ system

Espinoza

Petasecca

Cutajar

et al. 2015

Biomed. Phys. Eng. Express

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High dose rate (HDR) brachytherapy treatments can be incorrectly administered to patients due to human error and equipment malfunction. While the incidence rates of these events are low, an additional redundancy check could include independent verification of the plan prior to treatment. This work describes the verification of six patient HDR treatment plans using the 'magic phantom' (MPh) silicon diode array, and a specialized HDR position-time gamma analysis criteria. The possibility of accelerated treatment plan verification is additionally investigated by reducing the prescription dose to shorten the total time needed for measurement. The MPh system was able to determine the measured dwell positions and times from the six patient plans to within 1.3 mm and 0.3 s, respectively. Using the position-time gamma analysis, the delivery of all measured patient plans were found to pass this metric with pass rates of 100%. The approach of decreasing prescription dose gave equal pass rates to the full dose plan when evaluated using the criteria. It was identified that the total time for treatment verification is dependent on the number of needles used, and that a substantial decrease in the total time for verification could be made by reducing the prescription dose for plans containing a low number of needles. The application of this method may have the ability to streamline pretreatment verification of the afterloader delivery within the clinical setting. RECEIVED

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“…The first set of measurements is performed by keeping the SiPMs in darkness, while the second requires that the light produced in the fibre sensor is conveyed to the SiPM. To operate the system in stable and reproducible conditions, the characterisation is performed by irradiating the sensors with an X-ray beam, following the procedure outlined in [14]. The X-ray cabinet in use emits photons in the 0-35 kVp range and provides currents up to 1 mA, tunable with a granularity of 0.01 mA.…”

Section: System Characterisationmentioning

confidence: 99%

Design and commissioning of a Silicon Photomultiplier-based dosimeter for Low Dose Rate (LDR) oncological brachytherapy

Burdyko,

Caccia,

Giaz

et al. 2024

J. Inst.

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Brachytherapy is a radiotherapy procedure performed with radioactive sources implanted into the patient's body, close to the area affected by cancer. This is a reference procedure for the treatment of prostate and gynecologic cancer due to the reduction of the dose released close to organs at risk (e.g., rectum, bladder, colon). For this reason, real-time dose verification and source localisation are essential for an optimal treatment plan. The ORIGIN collaboration aims to achieve this goal through a 16-fibre sensor system, designed to house a small volume of scintillating material in a transparent fibre tip to enable point-like measurements. The selected scintillating materials feature a decay time of about 500 μs and the signal associated with the primary γ-ray interaction results in the emission of a sequence of single photons distributed over time. Therefore, the dosimeter requires a detector with single-photon sensitivity and a system designed to provide dose measurements by photon counting. Uniformity of fibre response, system stability and reproducibility of measurements are key features of the dosimeter. The characterisation of the 16-channel dosimeter system equipped with thermo-electrically cooled Silicon Photomultipliers, carried out in the laboratory using an X-ray cabinet, is discussed and the results are compared with an earlier version equipped with SiPMs operated at room temperature.

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Dosimetry systems based on Gallium Nitride probe for radiotherapy, brachytherapy and interventional radiology

Cited by 7 publications

References 20 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

Pretreatment verification of high dose rate brachytherapy plans using the ‘magic phantom’ system

Design and commissioning of a Silicon Photomultiplier-based dosimeter for Low Dose Rate (LDR) oncological brachytherapy

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