Benchmarking a novel inorganic scintillation detector for applications in radiation therapy

Alharbi, Majed; Martyn, Michael; O'Keeffe, Sinéad; Therriault‐Proulx, François; Beaulieu, Luc; Foley, Mark

doi:10.1016/j.ejmp.2019.11.018

Cited by 15 publications

(14 citation statements)

References 34 publications

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“…Like other plastic detecting systems, 6,24,25 our proposed detector has the advantage of being water equivalent with lower energy dependence and dose perturbations, in comparison with inorganic scintillating detectors. 13,14,28 These results on the phantom prototype confirm the feasibility of developing systems based on waterequivalent scintillating ribbons for small-field QA. They are in-line with the state of the arts and compare well with the performances achieved by QA systems based on a high spatial resolution diode array.…”

Section: Phantom Performancessupporting

confidence: 63%

A novel QA phantom based on scintillating fiber ribbons with implementation of 2D dose tomography for small‐field radiotherapy

et al. 2022

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To develop a novel instrument for real-time quality assurance (QA) procedures in radiotherapy. The system implements a scintillation-based phantom and associated signal acquisition and processing modules and aims to monitor two-dimensional (2D) dose distributions of small fields. Materials and methods: For the proposed phantom, we have designed and realized a prototype implementing six high-resolution tissue-equivalent scintillating fiber ribbons stacked with in-plane 30 • rotated orientations from each other. Each ribbon output is coupled to a silicon photodiode linear array (with an element pitch of 400 µm) to detect scintillating signal, which represents the projected irradiation profile perpendicular to the ribbon's orientation. For the system providing six acquired projected dose profiles at different orientations, we have developed a two-step signal processing method to perform 2D dose reconstruction. The first step is to determine irradiation field geometry parameters using a tomographic geometry approach, and the second one is to perform specific penumbra estimation. The QA system prototype has been tested on a Novalis TrueBeam STX with a 6-MV photon beam for small elliptic fields defined by 5-and 10-mm cone collimators and for 10 × 10-and 20 × 10-mm 2 rectangular fields defined by the micro-multileaf collimator. Gamma index analysis using EBT3 films as reference has been carried out with tight 2%-dose-difference (DD)/700-µm-distance-to-agreement (DTA) as well as 1%-DD/1-mm-DTA criteria for evaluating the system performances. The testing also includes an evaluation of the proposed two-step field reconstruction method in comparison with two conventional methods: filtered back projection (FBP) and simultaneous iterative reconstruction technique (SIRT). Results: The reconstructed 2D dose distributions have gamma index pass rates higher than 95% for all the tested configurations as compared with EBT3 film measurements with both 2%-DD/700-µm-DTA and 1%-DD/1-mm criteria. 2D global gamma analysis shows that the two-step and FBP radiation field reconstruction methods systematically outperform the SIRT approach. Moreover, higher gamma index success rates are obtained with the two-step method than with FBP in the case of the fields defined with the stereotactic cones.

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Section: Phantom Performancessupporting

confidence: 63%

A novel QA phantom based on scintillating fiber ribbons with implementation of 2D dose tomography for small‐field radiotherapy

et al. 2022

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“…All the curves show similar behavior with a rapid increase, followed by a beam stabilization step (a plateau) ending with a rapid fall-down while the beam switched off. As the photon counter rise time is in the ns range, the longer rise time observed is due to LINAC beam stabilization and characteristics of the scintillator [43,44]. The maximum signal collected by the counter increases with field size.…”

Section: Relative Dose Response With Field Sizementioning

confidence: 99%

Dosimetric characterization of a small-scale (Zn,Cd)S:Ag inorganic scintillating detector to be used in radiotherapy

et al. 2021

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“…Highly sensitive X-ray detectors are much desired for achieving high-contrast images and reducing ionizing radiation risks in medical, industrial and scientific applications. [1,2] The modern mainstream indirect-conversion X-ray detection systems use an efficient scintillator (such as Gd 2 O 2 S:Tb [3] and (Zn,Cd)S:Ag [4] ), and have been applied in practical radiation therapy applications. [5,6] However, the indirect-conversion X-ray detectors have drawbacks of optical crosstalk and long luminance lifetime, thus, the researchers propose progressive direct-conversion X-ray detection systems aiming to realize high spatial resolution and low dose X-ray detection.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Direct‐Conversion Vacuum Flat‐Panel X‐Ray Detectors Formed by Ga₂O₃‐ZnO Heterojunction Cold Cathode and ZnS Target and their Photoelectron Multiplication Mechanism

Zhang

Chen

Wang

et al. 2022

Adv Materials Inter

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Benchmarking a novel inorganic scintillation detector for applications in radiation therapy

Cited by 15 publications

References 34 publications

A novel QA phantom based on scintillating fiber ribbons with implementation of 2D dose tomography for small‐field radiotherapy

A novel QA phantom based on scintillating fiber ribbons with implementation of 2D dose tomography for small‐field radiotherapy

Dosimetric characterization of a small-scale (Zn,Cd)S:Ag inorganic scintillating detector to be used in radiotherapy

Highly Sensitive Direct‐Conversion Vacuum Flat‐Panel X‐Ray Detectors Formed by Ga₂O₃‐ZnO Heterojunction Cold Cathode and ZnS Target and their Photoelectron Multiplication Mechanism

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Benchmarking a novel inorganic scintillation detector for applications in radiation therapy

Cited by 15 publications

References 34 publications

A novel QA phantom based on scintillating fiber ribbons with implementation of 2D dose tomography for small‐field radiotherapy

A novel QA phantom based on scintillating fiber ribbons with implementation of 2D dose tomography for small‐field radiotherapy

Dosimetric characterization of a small-scale (Zn,Cd)S:Ag inorganic scintillating detector to be used in radiotherapy

Highly Sensitive Direct‐Conversion Vacuum Flat‐Panel X‐Ray Detectors Formed by Ga2O3‐ZnO Heterojunction Cold Cathode and ZnS Target and their Photoelectron Multiplication Mechanism

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Highly Sensitive Direct‐Conversion Vacuum Flat‐Panel X‐Ray Detectors Formed by Ga₂O₃‐ZnO Heterojunction Cold Cathode and ZnS Target and their Photoelectron Multiplication Mechanism