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Guillochon N, Balde M, Popotte C, Pondard S, Desport C, Kien N, Carbillet F, Moreno R, Munier M. Validation of a New Scintillating Fiber Dosimeter for Radiation Dose Quality Control in Computed Tomography. SENSORS (BASEL, SWITZERLAND) 2023; 23:2614. [PMID: 36904817 PMCID: PMC10007295 DOI: 10.3390/s23052614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 02/23/2023] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
(1) Background: The IVIscan is a commercially available scintillating fiber detector designed for quality assurance and in vivo dosimetry in computed tomography (CT). In this work, we investigated the performance of the IVIscan scintillator and associated method in a wide range of beam width from three CT manufacturers and compared it to a CT chamber designed for Computed Tomography Dose Index (CTDI) measurements. (2) Methods: We measured weighted CTDI (CTDIw) with each detector in accordance with the requirements of regulatory tests and international recommendations for the minimum, maximum and the most used beam width in clinic and investigated the accuracy of the IVIscan system based on the assessment of the CTDIw deviation from the CT chamber. We also investigated the IVIscan accuracy for the whole range of the CT scans kV. (3) Results: We found excellent agreement between the IVIscan scintillator and the CT chamber for the whole range of beam widths and kV, especially for wide beams used on recent technology of CT scans. (4) Conclusions: These findings highlight that the IVIscan scintillator is a relevant detector for CT radiation dose assessments, and the method associated with calculating the CTDIw saves a significant amount of time and effort when performing tests, especially with regard to new CT technologies.
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Affiliation(s)
| | - Mamoutou Balde
- Fibermetrix, 7 Allée de l’Europe, 67960 Entzheim, France
| | - Christian Popotte
- Fibermetrix, 7 Allée de l’Europe, 67960 Entzheim, France
- INSERM U1296 Radiations: Défense, Santé, Environnement, 69008 Lyon, France
| | | | | | | | | | | | - Mélodie Munier
- Fibermetrix, 7 Allée de l’Europe, 67960 Entzheim, France
- ALARA Group, 67960 Entzheim, France
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2
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Guo J, Jian C, Zeng C, Xiong Z, Wang L, Zhou D. Dosimetric and spectroscopic study of LiMgPO 4 doped with Tm 3+ and Er 3. RSC Adv 2023; 13:4949-4957. [PMID: 36762087 PMCID: PMC9906652 DOI: 10.1039/d2ra07109f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 02/01/2023] [Indexed: 02/10/2023] Open
Abstract
Olivine-type phosphate LiMgPO4 doped with rare earth elements is considered a novel dosimetric material with excellent performance that is suitable for thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements. Novel LiMgPO4:Tm,Er samples were synthesized by a high-temperature solid-state reaction method. A detailed study of the TL and OSL of the samples was performed using β-ray irradiation and X-ray-excited optical luminescence (XEOL) spectroscopy. Density functional theory (DFT) calculations were performed to predict the preferential positions of thulium and erbium, and photoluminescence (PL) spectra and TL 3D spectra were analyzed. The DFT calculation results show that Mg is preferentially replaced by Tm/Er in the LiMgPO4 system. The PL/TL3D/XEOL spectra of the samples are dominated by the characteristic luminescence of Tm3+, and the OSL decay curve of photoluminescence has fast and slow decay components with decay constants of 5 s and 42 s, respectively. The TL and XEOL results show that LiMgPO4:Tm,Er has strong emission signals under different types of radiation rays. The PL/TL3D/XEOL spectral results show that Er3+ has no radiative excitation, but Tm3+ has strong luminescence, such that the sample still emits strong TL and PL signals. Two TL emission peaks occur at approximately 120 °C and 300 °C, where the high-temperature peak is significantly more intense than the low-temperature peak, promoting the stability of the TL and OSL signals of the samples. The TL curve consists of 6 general TL dynamic peaks. The nonlinear parameters of the TL dose response are R = 0.08 and D 0 = 479 Gy, and the OSL dose response is linear in the range of 0.2-1000 Gy. The TL and OSL signals of the LiMgPO4:Tm,Er phosphor have good repeatability. Therefore, the LiMgPO4:Tm,Er phosphor can be used for radiation dose measurement.
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Affiliation(s)
- Jingyuan Guo
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Chenxi Jian
- Faculty of Chemistry and Environment Science, Guangdong Ocean UniversityZhanjiang 524088China
| | - Caixing Zeng
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Zhengye Xiong
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Luyan Wang
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Dongcui Zhou
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
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Fadzil M, Noor N, Tamchek N, Ung N, Abdullah N, Dolah M, Bradley D. A cross-validation study of Ge-doped silica optical fibres and TLD-100 systems for high energy photon dosimetry audit under non-reference conditions. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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A competitive radioluminescence material - LiF:Mg,Cu,P for real-time dosimetry. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Oresegun A, Tarif ZH, Ghassan L, Zin H, Abdul-Rashid HA, Bradley DA. Radioluminescence of cylindrical and flat Ge-doped silica optical fibers for real-time dosimetry applications. Appl Radiat Isot 2021; 176:109812. [PMID: 34166948 DOI: 10.1016/j.apradiso.2021.109812] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 05/31/2021] [Accepted: 06/01/2021] [Indexed: 11/19/2022]
Abstract
Investigation has been made of the radioluminescence dose response of Ge-doped silica flat and cylindrical fibers subjected to 6 and 10 MV photon beams. The fibers have been custom fabricated, obtaining Ge dopant concentrations of 6 and 10 mol%, subsequently cut into 20 mm lengths. Each sample has been exposed under a set of similar conditions, with use made of a fixed field size and source to surface distance (SSD). Investigation of dosimetric performance has involved radioluminescence linearity, dose-rate dependence, energy dependence, and reproducibility. Mass for mass, the 6 mol% Ge-doped samples provided the greater radioluminescence yield, with both flat and cylindrical fibers responding linearly to the absorbed dose. Further found has been that the cylindrical fibers provided a yield some 38% greater than that of the flat fibers. At 6 MV, the cylindrical fibers were also found to exhibit repeatability variation of <1%, superior to that of the flat fibers, offering strong potential for use in real-time dosimetry applications.
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Affiliation(s)
- Adebiyi Oresegun
- Fibre Optics Research Centre, Faculty of Engineering, Multimedia University, Jalan Multimedia, 63100, Cyberjaya, Malaysia
| | - Zubair H Tarif
- Fibre Optics Research Centre, Faculty of Engineering, Multimedia University, Jalan Multimedia, 63100, Cyberjaya, Malaysia; Lumisysns Technology Sdn Bhd, Cyberjaya, 63100, Selangor, Malaysia
| | - Louay Ghassan
- Fibre Optics Research Centre, Faculty of Engineering, Multimedia University, Jalan Multimedia, 63100, Cyberjaya, Malaysia
| | - Hafiz Zin
- Advanced Medical and Dental Institute, Universiti Sains Malaysia (USM), Bertam, 13200, Kepala Batas Penang, Malaysia
| | - Hairul Azhar Abdul-Rashid
- Fibre Optics Research Centre, Faculty of Engineering, Multimedia University, Jalan Multimedia, 63100, Cyberjaya, Malaysia.
| | - D A Bradley
- Centre for Applied Physics and Radiation Technologies, Sunway University, 46150, PJ, Malaysia; Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
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Kim TJ, Cheng K, Zhang H, Liu S, Skinner L, Xing L. Second window near-infrared dosimeter (NIR2D) system for radiation dosimetry. Phys Med Biol 2020; 65:175013. [PMID: 32869751 DOI: 10.1088/1361-6560/ab9b56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Fiber-coupled scintillation dosimeters are a cost-effective alternative to the conventional ion chambers in radiation dosimetry. However, stem effects from optical fibers such as Cerenkov radiation incur significant errors in the readout signal. Here we introduce a second near-infrared window dosimeter, dubbed as NIR2D, that can potentially be used as real-time radiation detector for clinical megavoltage beams. Lanthanide-based rare-earth NaYF4 nano-phosphors doped with both erbium and cerium elements were synthesized, and a compact 3D printed reader device integrated with a photodetector and data acquisition system was designed. The performance of the NIR2D was tested using a pre-clinical orthovoltage radiation source and a clinical megavoltage radiation source. The system was tested for dose linearity (100, 200, 600 MU), dose rate dependency (100, 200, 400, 600 MU min-1), and energy dependency (6, 10, 15 MV). Test results with the clinical linear accelerator demonstrated excellent dose linearity and dose rate independency when exposed to 6 MV linac beams-both data follows a linear trendline with R2 > 0.99. On the other hand, the NIR2D was energy dependent, where the readout dropped by 9% between 6 and 15 MV. For stem effects, we observed a finite Cerenkov contribution of 1%-3% when exposed between 100-600 MU min-1 (6 MV) and 3%-6% when exposed between 5-15 MV (600 MU min-1). While the stem effects were still observable, we expect that enhancing the current optical setup will simultaneously improve the scintillation signal and reduce the stem effects.
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Affiliation(s)
- Tae Jin Kim
- Department of Radiation Oncology, Stanford University, Stanford, CA 94305, United States of America. These authors contributed equally to this work
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Melada J, Arosio P, Gargano M, Veronese I, Gallo S, Ludwig N. Optical reflectance apparatus for moisture content determination in porous media. Microchem J 2020. [DOI: 10.1016/j.microc.2020.104627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Novel Gd 3+-doped silica-based optical fiber material for dosimetry in proton therapy. Sci Rep 2019; 9:16376. [PMID: 31704964 PMCID: PMC6841944 DOI: 10.1038/s41598-019-52608-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 10/14/2019] [Indexed: 12/25/2022] Open
Abstract
Optical fibers hold promise for accurate dosimetry in small field proton therapy due to their superior spatial resolution and the lack of significant Cerenkov contamination in proton beams. One known drawback for most scintillation detectors is signal quenching in areas of high linear energy transfer, as is the case in the Bragg peak region of a proton beam. In this study, we investigated the potential of innovative optical fiber bulk materials using the sol-gel technique for dosimetry in proton therapy. This type of glass is made of amorphous silica (SiO\documentclass[12pt]{minimal}
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\begin{document}$${}_{2}$$\end{document}2) and is doped with Gd\documentclass[12pt]{minimal}
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\begin{document}$${}^{3+}$$\end{document}3+ ions and possesses very interesting light emission properties with a luminescence band around 314 nm when exposed to protons. The fibers were manufactured at the University of Lille and tested at the TRIUMF Proton Therapy facility with 8.2–62.9 MeV protons and 2–6 nA of extracted beam current. Dose-rate dependence and quenching were measured and compared to other silica-based fibers also made by sol-gel techniques and doped with Ce\documentclass[12pt]{minimal}
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\begin{document}$${}^{3+}$$\end{document}3+ and Cu\documentclass[12pt]{minimal}
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\begin{document}$${}^{+}$$\end{document}+. The three fibers present strong luminescence in the UV (Gd) or visible (Cu,Ce) under irradiation, with the emission intensities related directly to the proton flux. In addition, the 0.5 mm diameter Gd\documentclass[12pt]{minimal}
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\begin{document}$${}^{3+}$$\end{document}3+-doped fiber shows superior resolution of the Bragg peak, indicating significantly reduced quenching in comparison to the Ce\documentclass[12pt]{minimal}
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\begin{document}$${}^{3+}$$\end{document}3+ and Cu\documentclass[12pt]{minimal}
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\begin{document}$${}^{+}$$\end{document}+ fibers with a Birks’ constant, k\documentclass[12pt]{minimal}
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\begin{document}$${}_{B}$$\end{document}B, of (0.0162 \documentclass[12pt]{minimal}
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\begin{document}$$\pm $$\end{document}± 0.0003) cm/MeV in comparison to (0.0333 \documentclass[12pt]{minimal}
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\begin{document}$$\pm $$\end{document}± 0.0006) cm/MeV and (0.0352 \documentclass[12pt]{minimal}
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\begin{document}$$\pm $$\end{document}± 0.0003) cm/MeV, respectively. To our knowledge, this is the first report of such an interesting k\documentclass[12pt]{minimal}
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\begin{document}$${}_{B}$$\end{document}B for a silica-based optical fiber material, showing clearly that this fiber presents lower quenching than common plastic scintillators. This result demonstrates the high potential of this inorganic fiber material for proton therapy dosimetry.
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Archer J, Li E, Davis J, Cameron M, Rosenfeld A, Lerch M. High spatial resolution scintillator dosimetry of synchrotron microbeams. Sci Rep 2019; 9:6873. [PMID: 31053762 PMCID: PMC6499773 DOI: 10.1038/s41598-019-43349-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 04/10/2019] [Indexed: 11/23/2022] Open
Abstract
Microbeam radiation therapy is a novel pre-clinical external beam therapy that uses high-brilliance synchrotron X-rays to deliver the necessary high dose rates. The unique conditions of high dose rate and high spatial fractionation demand a new class of detector to experimentally measure important beam quality parameters. Here we demonstrate the highest spatial resolution plastic scintillator fibre-optic dosimeter found in the literature to date and tested it on the Imaging and Medical Beam-Line at the Australian Synchrotron in a X-ray beam where the irradiation dose rate was 4435 Gy/s. With a one-dimensional spatial resolution of 10 μm the detector is able to resolve the individual microbeams (53.7 ± 0.4 μm wide), and measure the peak-to-valley dose ratio to be 55 ± 17. We also investigate the role of radioluminescence in the optical fibre used to transport the scintillation photons, and conclude that it creates a significant contribution to the total light detected.
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Affiliation(s)
- James Archer
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Enbang Li
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia.
| | - Jeremy Davis
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Matthew Cameron
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Anatoly Rosenfeld
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Michael Lerch
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, 2522, Australia
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
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Cova F, Moretti F, Fasoli M, Chiodini N, Pauwels K, Auffray E, Lucchini MT, Baccaro S, Cemmi A, Bártová H, Vedda A. Radiation hardness of Ce-doped sol-gel silica fibers for high energy physics applications. OPTICS LETTERS 2018; 43:903-906. [PMID: 29444023 DOI: 10.1364/ol.43.000903] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 01/17/2018] [Indexed: 06/08/2023]
Abstract
The results of irradiation tests on Ce-doped sol-gel silica using x- and γ-rays up to 10 kGy are reported in order to investigate the radiation hardness of this material for high-energy physics applications. Sol-gel silica fibers with Ce concentrations of 0.0125 and 0.05 mol. % are characterized by means of optical absorption and attenuation length measurements before and after irradiation. The two different techniques give comparable results, evidencing the formation of a main broad radiation-induced absorption band, peaking at about 2.2 eV, related to radiation-induced color centers. The results are compared with those obtained on bulk silica. This study reveals that an improvement of the radiation hardness of Ce-doped silica fibers can be achieved by reducing Ce content inside the fiber core, paving the way for further material development.
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