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

Debnath, Sree Bash Chandra; Tonneau, D.; Fauquet, C.; Tallet, Agnés; Gonçalvès, Anthony; Darréon, J.

doi:10.1016/j.ejmp.2021.03.022

Cited by 13 publications

(12 citation statements)

References 43 publications

(65 reference statements)

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“…The stem effect was eliminated using the two‐fiber subtraction method. 6 , 7 The two‐fiber subtraction method used two optical fibers. One optical fiber was attached to the plastic scintillator, and the other, called the Cerenkov fiber, was not.…”

Section: Methodsmentioning

confidence: 99%

“… 3 , 4 They characterized their plastic scintillator dosimeter and measured basic beam data in radiotherapy, such as the percentage depth dose (PDD). From then on, research on a scintillation dosimeter had shown a steady rise with a focus on the scintillator material, 5 , 6 development of the photodetector, 7 , 8 , 9 innovation on the optical guide, 10 , 11 elimination of the stem effect, 12 , 13 , 14 and the dimension of measurements. 15 , 16 Plastic scintillator dosimeters have been used to tackle complex and advanced dosimetry challenges in radiotherapy, such as the small field, 16 particle therapy, 17 magnetic influence, 18 and ultra‐high dose rate.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

Wahabi,

Wong,

Mahdiraji

et al. 2024

J Applied Clin Med Phys

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IntroductionRadiation dose measurement is an essential part of radiotherapy to verify the correct delivery of doses to patients and ensure patient safety. Recent advancements in radiotherapy technology have highlighted the need for fast and precise dosimeters. Technologies like FLASH radiotherapy and magnetic‐resonance linear accelerators (MR‐LINAC) demand dosimeters that can meet their unique requirements. One promising solution is the plastic scintillator‐based dosimeter with high spatial resolution and real‐time dose output. This study explores the feasibility of using the LuSy dosimeter, an in‐house developed plastic scintillator dosimeter for dose verification across various radiotherapy techniques, including conformal radiotherapy (CRT), intensity‐modulated radiation therapy (IMRT), volumetric‐modulated arc therapy (VMAT), and stereotactic radiosurgery (SRS).Materials and methodsA new dosimetry system, comprising a new plastic scintillator as the sensing material, was developed and characterized for radiotherapy beams. Treatment plans were created for conformal radiotherapy, IMRT, VMAT, and SRS and delivered to a phantom. LuSy dosimeter was used to measure the delivered dose for each plan on the surface of the phantom and inside the target volumes. Then, LuSy measurements were compared against an ionization chamber, MOSFET dosimeter, radiochromic films, and dose calculated using the treatment planning system (TPS).ResultsFor CRT, surface dose measurement by LuSy dosimeter showed a deviation of ‐5.5% and ‐5.4% for breast and abdomen treatment from the TPS, respectively. When measuring inside the target volume for IMRT, VMAT, and SRS, the LuSy dosimeter produced a mean deviation of ‐3.0% from the TPS. Surface dose measurement resulted in higher TPS discrepancies where the deviations for IMRT, VMAT, and SRS were ‐2.0%, ‐19.5%, and 16.1%, respectively.ConclusionThe LuSy dosimeter was feasible for measuring radiotherapy doses for various treatment techniques. Treatment delivery verification enables early error detection, allowing for safe treatment delivery for radiotherapy patients.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

Wahabi,

Wong,

Mahdiraji

et al. 2024

J Applied Clin Med Phys

View full text Add to dashboard Cite

show abstract

“…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%

“…[10,11] The cold cathode vacuum flat-panel X-ray detectors based on HARP-FEA (high-gain avalanche rushing amorphous photoconductor-field emitter array) demonstrated a high X-ray detection sensitivity using an avalanche multiplier effect. [12] The HARPs showed a high avalanche multiplication gain (≈10 4 ) and a low leakage current (20 pA mm -2 ), making the HARP-FEA detectors realize a sensitivity higher than the commercial charge-coupled device. [13] In addition, the cold cathode vacuum detectors exhibited the advantages of high spatial resolution (20 μm) and high tolerance to Gamma-ray irradiation (1 MGy air ).…”

mentioning

confidence: 99%

“…[15,16] The ZnO NW field emitters exhibited the advantages of simple preparation methods, low cost, large area and excellent field emission performance. [17] The photoconductivity of the ZnS thin film increased significantly upon bombardment with electrons from the filed emitters, which led to an internal photoconductive gain (≈10 4 ). [18] In addition, the direct-conversion X-ray detectors…”

mentioning

confidence: 99%

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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

Zhang

Chen

Wang

et al. 2022

Adv Materials Inter

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Technical note: Point‐by‐point ion‐recombination correction for accurate dose profile measurement in high dose‐per‐pulse irradiation field

Kojima,

Ishikawa,

Takigami

2023

Medical Physics

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BackgroundAlthough flattening filter free (FFF) beams are commonly used in clinical treatment, the accuracy of dose measurements in FFF beams has been questioned. Higher dose per pulse (DPP) such as FFF beams from a linear accelerator may cause problems in dose profile measurements using an ionization chamber due to the change of the charge collection efficiency. Ionization chambers are commonly used for percent depth dose (PDD) measurements. Changes of DPP due to chamber movement during PDD measurement can vary the ion collection efficiency of ionization chambers. In the case of FF beams, the DPP fluctuation is negligible, but in the case of the FFF beams, the DPP is 2.5 ∼ 4 times larger than that of the FF beam, and the change in ion collection efficiency is larger than that of the FF beam. PDD profile normalized by maximum dose depth, 10 cm depth for example, may therefore be affected by the ion collection efficiency.PurposeIn this study, we investigate the characteristics of the ion collection efficiency change depending on the DPP of each ionization chamber in the FFF beam. We furthermore propose a method to obtain the chamber‐ independent PDD by applying a DPP‐dependent ion recombination correction.MethodsPrior to investigating the relationship between DPP and charge collection efficiency, Jaffe‐plots were generated with different DPP settings to investigate the linearity between the applied voltage and collected charge. The absolute dose measurement using eight ionization chambers under the irradiation settings of 0.148, 0.087, and 0.008 cGy/pulse were performed. Applied voltages for the Jaffe‐plots were 100, 125, 150, 200, 250, and 300 V. The ion recombination correction factor Pion was calculated by the two‐voltage analysis (TVA) method at the applied voltages of 300 and 100 V. The DPP dependency of the charge collection efficiency for each ionization chamber were evaluated from the DPP‐ Pion plot. PDD profiles for the 10 MV FFF beam were measured using Farmer type chambers (TN30013, FC65‐P, and FC65‐G) and mini‐type chambers (TN31010, TN31021, CC13, CC04, and FC23‐C). The PDD profiles were corrected with ion recombination correction at negative and positive polar applied voltages of 100 and 300 V.ResultsFrom the DPP‐Pion relation for each ionization chamber with DPP ranging from 0.008 cGy/pulse to 0.148 cGy/pulse, all Farmer and mini‐type chambers satisfied the requirements described in AAPM TG‐51 addendum. However, Pion for the CC13 was most affected by DPP among tested chambers. The maximum deviation among PDDs using eight ionization chambers for 10 MV FFF was about 1%, but the deviation was suppressed to about 0.5% by applying ion recombination correction at each depth.ConclusionsIn this study, the deviation of PDD profile among the ionization chambers was reduced by the ion recombination coefficient including the DPP dependency, especially for high DPP beams such as FFF beams. The present method is particularly effective for CC13, where the ion collection efficiency is highly DPP dependent.

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

Cited by 13 publications

References 43 publications

Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

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

Technical note: Point‐by‐point ion‐recombination correction for accurate dose profile measurement in high dose‐per‐pulse irradiation field

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

Cited by 13 publications

References 43 publications

Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

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

Technical note: Point‐by‐point ion‐recombination correction for accurate dose profile measurement in high dose‐per‐pulse irradiation field

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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