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Félix-Bautista R, Hamad Y, Yáñez-González T, Ochoa-Parra P, Granja C, Martišíková M, Mairani A, Gehrke T. Towards precise LET measurements based on energy deposition of therapeutic ions in Timepix3 detectors. Phys Med Biol 2024; 69:125030. [PMID: 38815613 DOI: 10.1088/1361-6560/ad5267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 05/30/2024] [Indexed: 06/01/2024]
Abstract
Objective.There is an increasing interest in calculating and measuring linear energy transfer (LET) spectra in particle therapy in order to assess their impact in biological terms. As such, the accuracy of the particle fluence energy spectra becomes paramount. This study focuses on quantifying energy depositions of distinct proton, helium, carbon, and oxygen ion beams using a silicon pixel detector developed at CERN to determine LET spectra in silicon.Approach.While detection systems have been investigated in this pursuit, the scarcity of detectors capable of providing per-ion data with high spatial and temporal resolution remains an issue. This gap is where silicon pixel detector technology steps in, enabling online tracking of single-ion energy deposition. The used detector consisted of a 300µm thick silicon sensor operated in partial depletion.Main results.During post-processing, artifacts in the acquired signals were identified and methods for their corrections were developed. Subsequently, a correlation between measured and Monte Carlo-based simulated energy deposition distributions was performed, relying on a two-step recalibration approach based on linear and saturating exponential models. Despite the observed saturation effects, deviations were confined below 7% across the entire investigated range of track-averaged LET values in silicon from 0.77 keVµm-1to 93.16 keVµm-1.Significance.Simulated and measured mean energy depositions were found to be aligned within 7%, after applying artifact corrections. This extends the range of accessible LET spectra in silicon to clinically relevant values and validates the accuracy and reliability of the measurements. These findings pave the way towards LET-based dosimetry through an approach to translate these measurements to LET spectra in water. This will be addressed in a future study, extending functionality of treatment planning systems into clinical routine, with the potential of providing ion-beam therapy of utmost precision to cancer patients.
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Affiliation(s)
- Renato Félix-Bautista
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Research in Radiation Oncology (NCRO), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Yasmin Hamad
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Research in Radiation Oncology (NCRO), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Faculty of Physics and Astronomy, Heidelberg University, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany
- Heidelberg Ion-Beam Therapy Center (HIT), Department of Radiation Oncology, Heidelberg University Hospital, Im Neuenheimer Feld 450, 69120 Heidelberg, Germany
- Clinical Cooperation Unit Translational Radiation Oncology, National Center for Tumor Diseases (NCT), Heidelberg University Hospital (UKHD) and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Tomás Yáñez-González
- Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Currently at Faculty of Mechanical Engineering, Leibniz University of Hannover
| | - Pamela Ochoa-Parra
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Research in Radiation Oncology (NCRO), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Faculty of Physics and Astronomy, Heidelberg University, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany
| | - Carlos Granja
- ADVACAM, Department of Research and Development, U Pergamenky 12, 17000 Prague, Czech Republic
| | - Mária Martišíková
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Research in Radiation Oncology (NCRO), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Andrea Mairani
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Research in Radiation Oncology (NCRO), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Heidelberg Ion-Beam Therapy Center (HIT), Department of Radiation Oncology, Heidelberg University Hospital, Im Neuenheimer Feld 450, 69120 Heidelberg, Germany
| | - Tim Gehrke
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Research in Radiation Oncology (NCRO), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Neuenheimer Feld 280, 69120 Heidelberg, Germany
- Department of Radiation Oncology, Heidelberg University Hospital, Im Neuenheimer Feld 450, 69120 Heidelberg, Germany
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Bobić M, Christensen JB, Lee H, Choulilitsa E, Czerska K, Togno M, Safai S, Yukihara EG, Winey BA, Lomax AJ, Paganetti H, Albertini F, Nesteruk KP. Optically stimulated luminescence dosimeters for simultaneous measurement of point dose and dose-weighted LET in an adaptive proton therapy workflow. Front Oncol 2024; 13:1333039. [PMID: 38510267 PMCID: PMC10951997 DOI: 10.3389/fonc.2023.1333039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 12/18/2023] [Indexed: 03/22/2024] Open
Abstract
Purpose To demonstrate the suitability of optically stimulated luminescence detectors (OSLDs) for accurate simultaneous measurement of the absolute point dose and dose-weighted linear energy transfer (LETD) in an anthropomorphic phantom for experimental validation of daily adaptive proton therapy. Methods A clinically realistic intensity-modulated proton therapy (IMPT) treatment plan was created based on a CT of an anthropomorphic head-and-neck phantom made of tissue-equivalent material. The IMPT plan was optimized with three fields to deliver a uniform dose to the target volume covering the OSLDs. Different scenarios representing inter-fractional anatomical changes were created by modifying the phantom. An online adaptive proton therapy workflow was used to recover the daily dose distribution and account for the applied geometry changes. To validate the adaptive workflow, measurements were performed by irradiating Al2O3:C OSLDs inside the phantom. In addition to the measurements, retrospective Monte Carlo simulations were performed to compare the absolute dose and dose-averaged LET (LETD) delivered to the OSLDs. Results The online adaptive proton therapy workflow was shown to recover significant degradation in dose conformity resulting from large anatomical and positioning deviations from the reference plan. The Monte Carlo simulations were in close agreement with the OSLD measurements, with an average relative error of 1.4% for doses and 3.2% for LETD. The use of OSLDs for LET determination allowed for a correction for the ionization quenched response. Conclusion The OSLDs appear to be an excellent detector for simultaneously assessing dose and LET distributions in proton irradiation of an anthropomorphic phantom. The OSLDs can be cut to almost any size and shape, making them ideal for in-phantom measurements to probe the radiation quality and dose in a predefined region of interest. Although we have presented the results obtained in the experimental validation of an adaptive proton therapy workflow, the same approach can be generalized and used for a variety of clinical innovations and workflow developments that require accurate assessment of point dose and/or average LET.
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Affiliation(s)
- Mislav Bobić
- Department of Physics, ETH Zurich, Zurich, Switzerland
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | | | - Hoyeon Lee
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Evangelia Choulilitsa
- Department of Physics, ETH Zurich, Zurich, Switzerland
- Paul Scherrer Institute, Villigen, Switzerland
| | | | | | | | | | - Brian A. Winey
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Antony J. Lomax
- Department of Physics, ETH Zurich, Zurich, Switzerland
- Paul Scherrer Institute, Villigen, Switzerland
| | - Harald Paganetti
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | | | - Konrad P. Nesteruk
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
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Wróbel D, Kowalski T, Kusyk S, Marczewska B, Nowak T, Olko P, Swakoń J. Application of LiMgPO4 crystal for proton beam quality control in radiotherapy. RADIATION PROTECTION DOSIMETRY 2023; 199:1937-1940. [PMID: 37819291 PMCID: PMC10566436 DOI: 10.1093/rpd/ncac214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 09/20/2022] [Accepted: 09/26/2022] [Indexed: 10/13/2023]
Abstract
The radioluminescence (RL) emitted by LiMgPO4 detector under proton beam irradiation was investigated in real time at the radiotherapy facility in the Institute of Nuclear Physics Polish Academy of Sciences in Krakow. The facility uses protons accelerated by the AIC-144 isochronous cyclotron up to the energy of 60 MeV. The measurements of RL were carried out using a remote optical fiber device with a luminophore detector and photomultiplier located at opposite ends of the optical fiber. A thin slice of LiMgPO4 doped with Tm (1.2 mol%) crystal was exposed to the proton beam. The tested detector allowed for the measurement of proton beam current, flux fluence and determination of proton beam time structure parameters. The investigation of LiMgPO4 crystal showed its high sensitivity, fast reaction time to irradiation and possibility of application as the detector for control of proton beam parameters.
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Affiliation(s)
- Damian Wróbel
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Tomasz Kowalski
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Sebastian Kusyk
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Barbara Marczewska
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Tomasz Nowak
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Paweł Olko
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Jan Swakoń
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
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Bossin L, Plokhikh I, Christensen JB, Gawryluk DJ, Kitagawa Y, Leblans P, Tanabe S, Vandenbroucke D, Yukihara EG. Addressing Current Challenges in OSL Dosimetry Using MgB 4O 7:Ce,Li: State of the Art, Limitations and Avenues of Research. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3051. [PMID: 37109886 PMCID: PMC10142933 DOI: 10.3390/ma16083051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/29/2023] [Accepted: 04/03/2023] [Indexed: 06/19/2023]
Abstract
The objective of this work is to review and assess the potential of MgB4O7:Ce,Li to fill in the gaps where the need for a new material for optically stimulated luminescence (OSL) dosimetry has been identified. We offer a critical assessment of the operational properties of MgB4O7:Ce,Li for OSL dosimetry, as reviewed in the literature and complemented by measurements of thermoluminescence spectroscopy, sensitivity, thermal stability, lifetime of the luminescence emission, dose response at high doses (>1000 Gy), fading and bleachability. Overall, compared with Al2O3:C, for example, MgB4O7:Ce,Li shows a comparable OSL signal intensity following exposure to ionizing radiation, a higher saturation limit (ca 7000 Gy) and a shorter luminescence lifetime (31.5 ns). MgB4O7:Ce,Li is, however, not yet an optimum material for OSL dosimetry, as it exhibits anomalous fading and shallow traps. Further optimization is therefore needed, and possible avenues of investigation encompass gaining a better understanding of the roles of the synthesis route and dopants and of the nature of defects.
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Affiliation(s)
- Lily Bossin
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
| | - Igor Plokhikh
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland
| | - Jeppe Brage Christensen
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
| | - Dariusz Jakub Gawryluk
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland
| | - Yuuki Kitagawa
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
| | - Paul Leblans
- Radiology Division, Agfa NV, 2640 Mortsel, Belgium
| | - Setsuhisa Tanabe
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
| | | | - Eduardo Gardenali Yukihara
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
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5
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de Freitas Nascimento L, Leblans P, van der Heyden B, Akselrod M, Goossens J, Correa Rocha LE, Vaniqui A, Verellen D. Characterisation and Quenching Correction for an Al 2O 3:C Optical Fibre Real Time System in Therapeutic Proton, Helium, and Carbon-Charged Beams. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22239178. [PMID: 36501879 DOI: 10.1016/j.sna.2022.113781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/21/2022] [Accepted: 11/23/2022] [Indexed: 05/24/2023]
Abstract
Real time radioluminescence fibre-based detectors were investigated for application in proton, helium, and carbon therapy dosimetry. The Al2O3:C probes are made of one single crystal (1 mm) and two droplets of micro powder in two sizes (38 μm and 4 μm) mixed with a water-equivalent binder. The fibres were irradiated behind different thicknesses of solid slabs, and the Bragg curves presented a quenching effect attributed to the nonlinear response of the radioluminescence (RL) signal as a function of linear energy transfer (LET). Experimental data and Monte Carlo simulations were utilised to acquire a quenching correction method, adapted from Birks' formulation, to restore the linear dose-response for particle therapy beams. The method for quenching correction was applied and yielded the best results for the '4 μm' optical fibre probe, with an agreement at the Bragg peak of 1.4% (160 MeV), and 1.5% (230 MeV) for proton-charged particles; 2.4% (150 MeV/u) for helium-charged particles and of 4.8% (290 MeV/u) and 2.9% (400 MeV/u) for the carbon-charged particles. The most substantial deviations for the '4 μm' optical fibre probe were found at the falloff regions, with ~3% (protons), ~5% (helium) and 6% (carbon).
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Affiliation(s)
| | | | | | - Mark Akselrod
- Landauer, Stillwater Crystal Growth Division, Stillwater, OK 74074, USA
| | - Jo Goossens
- Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
- Iridium Netwerk, University of Antwerp, 2610 Antwerp, Belgium
| | - Luis Enrique Correa Rocha
- Department of Economics, Ghent University, 9000 Ghent, Belgium
- Department of Physics and Astronomy, Ghent University, 9000 Ghent, Belgium
| | - Ana Vaniqui
- Belgian Nuclear Research Centre, SCK CEN, 2400 Mol, Belgium
| | - Dirk Verellen
- Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
- Iridium Netwerk, University of Antwerp, 2610 Antwerp, Belgium
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6
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de Freitas Nascimento L, Leblans P, van der Heyden B, Akselrod M, Goossens J, Correa Rocha LE, Vaniqui A, Verellen D. Characterisation and Quenching Correction for an Al 2O 3:C Optical Fibre Real Time System in Therapeutic Proton, Helium, and Carbon-Charged Beams. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22239178. [PMID: 36501879 PMCID: PMC9737660 DOI: 10.3390/s22239178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/21/2022] [Accepted: 11/23/2022] [Indexed: 05/08/2023]
Abstract
Real time radioluminescence fibre-based detectors were investigated for application in proton, helium, and carbon therapy dosimetry. The Al2O3:C probes are made of one single crystal (1 mm) and two droplets of micro powder in two sizes (38 μm and 4 μm) mixed with a water-equivalent binder. The fibres were irradiated behind different thicknesses of solid slabs, and the Bragg curves presented a quenching effect attributed to the nonlinear response of the radioluminescence (RL) signal as a function of linear energy transfer (LET). Experimental data and Monte Carlo simulations were utilised to acquire a quenching correction method, adapted from Birks' formulation, to restore the linear dose-response for particle therapy beams. The method for quenching correction was applied and yielded the best results for the '4 μm' optical fibre probe, with an agreement at the Bragg peak of 1.4% (160 MeV), and 1.5% (230 MeV) for proton-charged particles; 2.4% (150 MeV/u) for helium-charged particles and of 4.8% (290 MeV/u) and 2.9% (400 MeV/u) for the carbon-charged particles. The most substantial deviations for the '4 μm' optical fibre probe were found at the falloff regions, with ~3% (protons), ~5% (helium) and 6% (carbon).
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Affiliation(s)
| | | | | | - Mark Akselrod
- Landauer, Stillwater Crystal Growth Division, Stillwater, OK 74074, USA
| | - Jo Goossens
- Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
- Iridium Netwerk, University of Antwerp, 2610 Antwerp, Belgium
| | - Luis Enrique Correa Rocha
- Department of Economics, Ghent University, 9000 Ghent, Belgium
- Department of Physics and Astronomy, Ghent University, 9000 Ghent, Belgium
| | - Ana Vaniqui
- Belgian Nuclear Research Centre, SCK CEN, 2400 Mol, Belgium
| | - Dirk Verellen
- Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
- Iridium Netwerk, University of Antwerp, 2610 Antwerp, Belgium
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7
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Time-resolved radiation dosimetry using a cerium and terbium Co-doped YAG crystal scintillator. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Cohen LO, Ghosh P, Berner A, Marder R, Kaplan WD. The Solubility Limit of Carbon in Alumina at 1,600°C. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2022; 29:1-11. [PMID: 36073062 DOI: 10.1017/s1431927622012491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The solubility limit of carbon in α-Al2O3 (alumina) equilibrated at 1,600°C under He in a graphite furnace was measured by wavelength-dispersive spectroscopy. Undoped alumina and alumina containing carbon at a concentration resulting in the precipitation of a second phase were prepared and equilibrated at 1,600°C. The undoped alumina was used to quantify the amount of carbon deposited on the surface of samples because of hydrocarbon contamination in the electron microscope, and this background level was removed from the signal measured from carbon-doped samples. The solubility limit of carbon in alumina was found to be 5,300 ± 390 at. ppm, and it is believed that carbon substitutes oxygen as an anion and is charge-compensated by oxygen vacancies. Doping alumina with carbon at concentrations below the solubility limit does not impede densification and reduces grain growth. Doping above the solubility limit hinders densification during sintering.
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Affiliation(s)
- Li-Or Cohen
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Priyadarshini Ghosh
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Alex Berner
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Rachel Marder
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Wayne D Kaplan
- Department of Materials Science and Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel
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9
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Christensen JB, Togno M, Bossin L, Pakari OV, Safai S, Yukihara EG. Improved simultaneous LET and dose measurements in proton therapy. Sci Rep 2022; 12:8262. [PMID: 35585205 PMCID: PMC9117334 DOI: 10.1038/s41598-022-10575-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 04/11/2022] [Indexed: 11/23/2022] Open
Abstract
The objective of this study was to improve the precision of linear energy transfer (LET) measurements using \documentclass[12pt]{minimal}
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\begin{document}$$\text {Al}_2\text {O}_3\text {:C}$$\end{document}Al2O3:C optically stimulated luminescence detectors (OSLDs) in proton beams, and, with that, improve OSL dosimetry by correcting the readout for the LET-dependent ionization quenching. The OSLDs were irradiated in spot-scanning proton beams at different doses for fluence-averaged LET values in the (0.4–6.5) \documentclass[12pt]{minimal}
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\begin{document}$$\hbox {keV}\, \upmu \hbox {m}^{-1}$$\end{document}keVμm-1 range (in water). A commercial automated OSL reader with a built-in beta source was used for the readouts, which enabled a reference irradiation and readout of each OSLD to establish individual corrections. Pulsed OSL was used to separately measure the blue (F-center) and UV (\documentclass[12pt]{minimal}
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\begin{document}$$F^+$$\end{document}F+-center) emission bands of \documentclass[12pt]{minimal}
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\begin{document}$$\text {Al}_2\text {O}_3\text {:C}$$\end{document}Al2O3:C and the ratio between them (UV/blue signal) was used for the LET measurements. The average deviation between the simulated and measured LET values along the central beam axis amounts to 5.5% if both the dose and LET are varied, but the average deviation is reduced to 3.5% if the OSLDs are irradiated with the same doses. With the measurement procedure and automated equipment used here, the variation in the signals used for LET estimates and quenching-corrections is reduced from 0.9 to 0.6%. The quenching-corrected OSLD doses are in agreement with ionization chamber measurements within the uncertainties. The automated OSLD corrections are demonstrated to improve the LET estimates and the ionization quenching-corrections in proton dosimetry for a clinically relevant energy range up to 230 MeV. It is also for the first time demonstrated how the LET can be estimated for different doses.
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Affiliation(s)
- Jeppe Brage Christensen
- Department of Radiation Safety and Security, Paul Scherrer Institute, Villigen PSI, Switzerland.
| | - Michele Togno
- Center for Proton Therapy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Lily Bossin
- Department of Radiation Safety and Security, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Oskari Ville Pakari
- Department of Radiation Safety and Security, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Sairos Safai
- Center for Proton Therapy, Paul Scherrer Institute, Villigen PSI, Switzerland
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Thermoluminescence and optically stimulated luminescence response of Al2O3 coatings deposited by mist-chemical vapor deposition. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Yukihara E, Christensen J, Togno M. Demonstration of an optically stimulated luminescence (OSL) material with reduced quenching for proton therapy dosimetry: MgB4O7:Ce,Li. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106721] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Hirata Y, Sato T, Watanabe K, Ogawa T, Parisi A, Uritani A. Theoretical and experimental estimation of the relative optically stimulated luminescence efficiency of an optical-fiber-based BaFBr:Eu detector for swift ions. J NUCL SCI TECHNOL 2022. [DOI: 10.1080/00223131.2021.2017372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Yuho Hirata
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai, Japan
| | - Tatsuhiko Sato
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai, Japan
| | - Kenichi Watanabe
- Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Japan
| | - Tatsuhiko Ogawa
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai, Japan
| | - Alessio Parisi
- Expert Group in Radiation Protection Dosimetry and Calibration, Belgian Nuclear Research Centre (SCK CEN), Mol Belgium
| | - Akira Uritani
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
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Parisi A, Sawakuchi G, Granville D, Yukihara EG. Microdosimetric modeling of the relative efficiency of Al2O3:C (Luxel, blue emission) optically stimulated luminescent detectors exposed to ions from 1H to 132Xe. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2021.106678] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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14
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Vedelago J, Geser FA, Muñoz ID, Stabilini A, Yukihara EG, Jaekel O. Assessment of secondary neutrons in particle therapy by Monte Carlo simulations. Phys Med Biol 2021; 67. [PMID: 34905742 DOI: 10.1088/1361-6560/ac431b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 12/14/2021] [Indexed: 11/12/2022]
Abstract
OBJECTIVE The purpose of this study is to estimate the energy and angular distribution of secondary neutrons inside a phantom in hadron therapy, which will support decisions on detector choice and experimental setup design for in-phantom secondary neutron measurements. APPROACH Dedicated Monte Carlo simulations were implemented, considering clinically relevant energies of protons, helium and carbon ions. Since scored quantities can vary from different radiation transport models, the codes FLUKA, TOPAS and MCNP were used. The geometry of an active scanning beam delivery system for heavy ion treatment was implemented, and simulations of pristine and spread-out Bragg peaks were carried out. Previous studies, focused on specific ion types or single energies, are qualitatively in agreement with the obtained results. MAIN RESULTS The secondary neutrons energy distributions present a continuous spectrum with two peaks, one centred on the thermal/epithermal region, and one on the high-energy region, with the most probable energy ranging from 19 MeV up to 240 MeV, depending on the ion type and its initial energy. The simulations show that the secondary neutron energies may exceed 400 MeV and, therefore, suitable neutron detectors for this energy range shall be needed. Additionally, the angular distribution of the low energy neutrons is quite isotropic, whereas the fast/relativistic neutrons are mainly scattered in the down-stream direction. SIGNIFICANCE It would be possible to minimize the influence of the heavy ions when measuring the neutron-generated recoil protons by selecting appropriate measurement positions within the phantom. Although there are discrepancies among the three Monte Carlo codes, the results agree qualitatively and in order of magnitude, being sufficient to support further investigations with the ultimate goal of mapping the secondary neutron doses both in- and out-of-field in hadrontherapy. The obtained secondary neutron spectra are available as supplementary material.
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Affiliation(s)
- José Vedelago
- German Cancer Research Centre, Im Neuenheimer Feld 280, Heidelberg, 69120, GERMANY
| | - Federico A Geser
- Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI, 5232, SWITZERLAND
| | - Iván D Muñoz
- German Cancer Research Centre, Im Neuenheimer Feld 280, Heidelberg, 69120, GERMANY
| | - Alberto Stabilini
- Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI, 5235, SWITZERLAND
| | - Eduardo G Yukihara
- Paul Scherrer Institut, Forschungsstrasse 111, Villigen PSI, 5232, SWITZERLAND
| | - Oliver Jaekel
- German Cancer Research Centre, Im Neuenheimer Feld 280, Heidelberg, 69120, GERMANY
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Christensen JB, Togno M, Nesteruk KP, Psoroulas S, Meer D, Weber DC, Lomax T, Yukihara EG, Safai S. Al 2O 3:C optically stimulated luminescence dosimeters (OSLDs) for ultra-high dose rate proton dosimetry. Phys Med Biol 2021; 66. [PMID: 33571973 DOI: 10.1088/1361-6560/abe554] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 02/11/2021] [Indexed: 11/11/2022]
Abstract
The response of Al2O3:C optically stimulated luminescence detectors (OSLDs) was investigated in a 250 MeV pencil proton beam. The OSLD response was mapped for a wide range of average dose rates up to 9000 Gy s-1, corresponding to a ∼150 kGy s-1instantaneous dose rate in each pulse. Two setups for ultra-high dose rate (FLASH) experiments are presented, which enable OSLDs or biological samples to be irradiated in either water-filled vials or cylinders. The OSLDs were found to be dose rate independent for all dose rates, with an average deviation <1% relative to the nominal dose for average dose rates of (1-1000) Gy s-1when irradiated in the two setups. A third setup for irradiations in a 9000 Gy s-1pencil beam is presented, where OSLDs are distributed in a 3 × 4 grid. Calculations of the signal averaging of the beam over the OSLDs were in agreement with the measured response at 9000 Gy s-1. Furthermore, a new method was presented to extract the beam spot size of narrow pencil beams, which is in agreement within a standard deviation with results derived from radiochromic films. The Al2O3:C OSLDs were found applicable to support radiobiological experiments in proton beams at ultra-high dose rates.
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Affiliation(s)
| | - Michele Togno
- Center for Proton Therapy, Paul Scherrer Institute, Switzerland
| | | | | | - David Meer
- Center for Proton Therapy, Paul Scherrer Institute, Switzerland
| | - Damien Charles Weber
- Center for Proton Therapy, Paul Scherrer Institute, Switzerland.,Department of Radiation Oncology, University Hospital Zurich, Switzerland.,Department of Radiation Oncology, University Hospital Bern, Switzerland
| | - Tony Lomax
- Center for Proton Therapy, Paul Scherrer Institute, Switzerland.,Department of Physics, ETH Zurich, Switzerland
| | - Eduardo G Yukihara
- Department of Radiation Safety and Security, Paul Scherrer Institute, Switzerland
| | - Sairos Safai
- Center for Proton Therapy, Paul Scherrer Institute, Switzerland
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Yukihara EG, Kron T. APPLICATIONS OF OPTICALLY STIMULATED LUMINESCENCE IN MEDICAL DOSIMETRY. RADIATION PROTECTION DOSIMETRY 2020; 192:122-138. [PMID: 33412585 DOI: 10.1093/rpd/ncaa213] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 11/15/2020] [Accepted: 11/23/2020] [Indexed: 06/12/2023]
Abstract
If the first decade of the new millennium saw the establishment of a more solid foundation for the use of the Optically Stimulated Luminescence (OSL) in medical dosimetry, the second decade saw the technique take root and become more widely used in clinical studies. Recent publications report not only characterization and feasibility studies of the OSL technique for various applications in radiotherapy and radiology, but also the practical use of OSL for postal audits, estimation of staff dose, in vivo dosimetry, dose verification and dose mapping studies. This review complements previous review papers and reports on the topic, providing a panorama of the new advances and applications in the last decade. Attention is also dedicated to potential future applications, such as LET dosimetry, 2D/3D dosimetry using OSL, dosimetry in magnetic resonance imaging-guided radiotherapy (MRIgRT) and dosimetry of extremely high dose rates (FLASH therapy).
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Affiliation(s)
- Eduardo G Yukihara
- Department of Radiation Safety and Security, Paul Scherrer Institute, 5200 Villigen, Switzerland
| | - Tomas Kron
- Department of Physical Sciences, Peter MacCallum Cancer Centre, 3000 Melbourne, Australia
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Kry SF, Alvarez P, Cygler JE, DeWerd LA, Howell RM, Meeks S, O'Daniel J, Reft C, Sawakuchi G, Yukihara EG, Mihailidis D. AAPM TG 191: Clinical use of luminescent dosimeters: TLDs and OSLDs. Med Phys 2019; 47:e19-e51. [DOI: 10.1002/mp.13839] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 08/27/2019] [Accepted: 08/28/2019] [Indexed: 12/20/2022] Open
Affiliation(s)
- Stephen F. Kry
- The University of Texas MD Anderson Cancer Center Houston TX USA
| | - Paola Alvarez
- The University of Texas MD Anderson Cancer Center Houston TX USA
| | | | | | | | - Sanford Meeks
- University of Florida Health Cancer Center Orlando FL USA
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Marczewska B, Sas-Bieniarz A, Bilski P, Gieszczyk W, Kłosowski M, Sądel M. OSL and RL of LiMgPO4 crystals doped with rare earth elements. RADIAT MEAS 2019. [DOI: 10.1016/j.radmeas.2019.106205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Verkhovtsev A, Zimmer L, Greilich S. Calibration of intensity spectra from fluorescent nuclear track detectors in clinical ion beams. RADIAT MEAS 2019. [DOI: 10.1016/j.radmeas.2018.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Akselrod M, Kouwenberg J. Fluorescent nuclear track detectors – Review of past, present and future of the technology. RADIAT MEAS 2018. [DOI: 10.1016/j.radmeas.2018.07.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Spindeldreier C, Schrenk O, Ahmed M, Shrestha N, Karger C, Greilich S, Pfaffenberger A, Yukihara E. Feasibility of dosimetry with optically stimulated luminescence detectors in magnetic fields. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.03.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ahmed M, Shrestha N, Ahmad S, Schnell E, Akselrod M, Yukihara E. Demonstration of 2D dosimetry using Al 2 O 3 optically stimulated luminescence films for therapeutic megavoltage x-ray and ion beams. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.04.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ahmed MF, Schnell E, Ahmad S, Yukihara EG. Image reconstruction algorithm for optically stimulated luminescence 2D dosimetry using laser-scanned Al2O3:C and Al2O3:C,Mg films. Phys Med Biol 2016; 61:7484-7506. [DOI: 10.1088/0031-9155/61/20/7484] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Flint DB, Granville DA, Sahoo N, McEwen M, Sawakuchi GO. Ionization density dependence of the curve shape and ratio of blue to UV emissions of Al 2 O 3 :C optically stimulated luminescence detectors exposed to 6-MV photon and therapeutic proton beams. RADIAT MEAS 2016. [DOI: 10.1016/j.radmeas.2016.02.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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