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Domingo Muñoz I, Van Hoey O, Parisi A, Bassler N, Grzanka L, De Saint-Hubert M, Vaniqui A, Olko P, Sądel M, Stolarczyk L, Vestergaard A, Jäkel O, Gardenali Yukihara E, Brage Christensen J. Assessment of fluence- and dose-averaged linear energy transfer with passive luminescence detectors in clinical proton beams. Phys Med Biol 2024; 69:135004. [PMID: 38774985 DOI: 10.1088/1361-6560/ad4e8e] [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: 12/15/2023] [Accepted: 05/21/2024] [Indexed: 06/22/2024]
Abstract
Objective.This work investigates the use of passive luminescence detectors to determine different types of averaged linear energy transfer (LET-) for the energies relevant to proton therapy. The experimental results are compared to reference values obtained from Monte Carlo simulations.Approach.Optically stimulated luminescence detectors (OSLDs), fluorescent nuclear track detectors (FNTDs), and two different groups of thermoluminescence detectors (TLDs) were irradiated at four different radiation qualities. For each irradiation, the fluence- (LET-f) and dose-averaged LET (LET-d) were determined. For both quantities, two sub-types of averages were calculated, either considering the contributions from primary and secondary protons or from all protons and heavier, charged particles. Both simulated and experimental data were used in combination with a phenomenological model to estimate the relative biological effectiveness (RBE).Main results.All types ofLET-could be assessed with the luminescence detectors. The experimental determination ofLET-fis in agreement with reference data obtained from simulations across all measurement techniques and types of averaging. On the other hand,LET-dcan present challenges as a radiation quality metric to describe the detector response in mixed particle fields. However, excluding secondaries heavier than protons from theLET-dcalculation, as their contribution to the luminescence is suppressed by ionization quenching, leads to equal accuracy betweenLET-fandLET-d. Assessment of RBE through the experimentally determinedLET-dvalues agrees with independently acquired reference values, indicating that the investigated detectors can determineLET-with sufficient accuracy for proton therapy.Significance.OSLDs, TLDs, and FNTDs can be used to determineLET-and RBE in proton therapy. With the capability to determine dose through ionization quenching corrections derived fromLET-, OSLDs and TLDs can simultaneously ascertain dose,LET-, and RBE. This makes passive detectors appealing for measurements in phantoms to facilitate validation of clinical treatment plans or experiments related to proton therapy.
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Affiliation(s)
- Iván Domingo Muñoz
- Department of Physics and Astronomy, University of Heidelberg, Heidelberg, Germany
- Division of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Radiation Research in Oncology (NCRO), Heidelberg, Germany
| | | | - Alessio Parisi
- Department of Radiation Oncology, Mayo Clinic, Jacksonville, Florida, United States of America
| | - Niels Bassler
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
| | - Leszek Grzanka
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Kraków, Poland
| | | | - Ana Vaniqui
- Belgian Nuclear Research Center (SCK CEN), Mol, Belgium
| | - Paweł Olko
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Kraków, Poland
| | - Michał Sądel
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Kraków, Poland
| | - Liliana Stolarczyk
- Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
| | - Anne Vestergaard
- Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
| | - Oliver Jäkel
- Division of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Radiation Research in Oncology (NCRO), Heidelberg, Germany
- Department of Radiation Oncology, Heidelberg Ion-Beam Therapy Center (HIT), Heidelberg University Hospital, Heidelberg, Germany
| | | | - Jeppe Brage Christensen
- Department of Radiation Safety and Security, Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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Jeong S, Kim C, An S, Kwon YC, Pak SI, Cheon W, Shin D, Lim Y, Jeong JH, Kim H, Lee SB. Determination of the proton LET using thin film solar cells coated with scintillating powder. Med Phys 2023; 50:1194-1204. [PMID: 36135795 DOI: 10.1002/mp.15977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 08/30/2022] [Accepted: 08/30/2022] [Indexed: 11/08/2022] Open
Abstract
PURPOSE The amount of luminescent light detected in a scintillator is reduced with increased proton linear energy transfer (LET) despite receiving the same proton dose, through a phenomenon called quenching. This study evaluated the ability of a solar cell coated with scintillating powder (SC-SP) to measure therapeutic proton LET by measuring the quenching effect of the scintillating powder using a solar cell while simultaneously measuring the dose of the proton beam. METHODS SC-SP was composed of a flexible thin film solar cell and scintillating powder. The LET and dose of the pristine Bragg peak in the 14 cm range were calculated using a validated Monte Carlo model of a double scattering proton beam nozzle. The SC-SP was evaluated by measuring the proton beam under the same conditions at specific depths using SC-SP and Markus chamber. Finally, the 10 and 20 cm range pristine Bragg peaks and 5 cm spread-out Bragg peak (SOBP) in the 14 cm range were measured using the SC-SP and the Markus chamber. LETs measured using the SC-SP were compared with those calculated using Monte Carlo simulations. RESULTS The quenching factors of the SC-SP and solar cell alone, which were slopes of linear fit obtained from quenching correction factors according to LET, were 0.027 and 0.070 µm/keV (R2 : 0.974 and 0.975). For pristine Bragg peaks in the 10 and 20 cm ranges, the maximum differences between LETs measured using the SC-SP and calculated using Monte Carlo simulations were 0.5 keV/µm (15.7%) and 1.2 keV/µm (12.0%), respectively. For a 5 cm SOBP proton beam, the LET measured using the SC-SP and calculated using Monte Carlo simulations differed by up to 1.9 keV/µm (18.7%). CONCLUSIONS Comparisons of LETs for pristine Bragg peaks and SOBP between measured using the SC-SP and calculated using Monte Carlo simulations indicated that the solar cell-based system could simultaneously measure both LET and dose in real-time and is cost-effective.
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Affiliation(s)
- Seonghoon Jeong
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Chankyu Kim
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Seohyeon An
- Proton Therapy Center, National Cancer Center, Goyang, Korea.,Department of Physics, Hanyang University, Seoul, Korea
| | - Yong-Cheol Kwon
- Department of Radiation Oncology, Samsung Medical Center, Seoul, Korea
| | - Sang-Il Pak
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Wonjoong Cheon
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Dongho Shin
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Youngkyung Lim
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Jong Hwi Jeong
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Haksoo Kim
- Proton Therapy Center, National Cancer Center, Goyang, Korea
| | - Se Byeong Lee
- Proton Therapy Center, National Cancer Center, Goyang, Korea
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Muneem A, Yoshida J, Ekawa H, Hino M, Hirota K, Ichikawa G, Kasagi A, Kitaguchi M, Kodaira S, Mishima K, Nabi JU, Nakagawa M, Sakashita M, Saito N, Saito TR, Wada S, Yasuda N. Study on the reusability of fluorescent nuclear track detectors using optical bleaching. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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McFadden CH, Rahmanian S, Flint DB, Bright SJ, Yoon DS, O'Brien DJ, Asaithamby A, Abdollahi A, Greilich S, Sawakuchi GO. Isolation of time-dependent DNA damage induced by energetic carbon ions and their fragments using fluorescent nuclear track detectors. Med Phys 2019; 47:272-281. [PMID: 31677156 DOI: 10.1002/mp.13897] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 10/14/2019] [Accepted: 10/22/2019] [Indexed: 12/17/2022] Open
Abstract
PURPOSE High energetic carbon (C-) ion beams undergo nuclear interactions with tissue, producing secondary nuclear fragments. Thus, at depth, C-ion beams are composed of a mixture of different particles with different linear energy transfer (LET) values. We developed a technique to enable isolation of DNA damage response (DDR) in mixed radiation fields using beam line microscopy coupled with fluorescence nuclear track detectors (FNTDs). METHODS We imaged live cells on a coverslip made of FNTDs right after C-ion, proton or photon irradiation using an in-house built confocal microscope placed in the beam path. We used the FNTD to link track traversals with DNA damage and separated DNA damage induced by primary particles from fragments. RESULTS We were able to spatially link physical parameters of radiation tracks to DDR in live cells to investigate spatiotemporal DDR in multi-ion radiation fields in real time, which was previously not possible. We demonstrated that the response of lesions produced by the high-LET primary particles associates most strongly with cell death in a multi-LET radiation field, and that this association is not seen when analyzing radiation induced foci in aggregate without primary/fragment classification. CONCLUSIONS We report a new method that uses confocal microscopy in combination with FNTDs to provide submicrometer spatial-resolution measurements of radiation tracks in live cells. Our method facilitates expansion of the radiation-induced DDR research because it can be used in any particle beam line including particle therapy beam lines. CATEGORY Biological Physics and Response Prediction.
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Affiliation(s)
- Conor H McFadden
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Shirin Rahmanian
- Division of Medical Physics in Radiation Oncology, German Cancer Research Center, 69120, Heidelberg, Germany.,Heidelberg Institute for Radiation Oncology, National Center for Radiation Research in Oncology, 69120, Heidelberg, Germany
| | - David B Flint
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.,Graduate School of Biomedical Sciences, The University of Texas, Houston, TX, 77030, USA
| | - Scott J Bright
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - David S Yoon
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Daniel J O'Brien
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Aroumougame Asaithamby
- Division of Molecular Radiation Biology, Department of Radiation Oncology, The University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Amir Abdollahi
- Heidelberg Institute for Radiation Oncology, National Center for Radiation Research in Oncology, 69120, Heidelberg, Germany.,Division of Molecular and Translational Radiation Oncology, Heidelberg Ion-Beam Therapy Center, Heidelberg University Hospital, 69120, Heidelberg, Germany.,German Cancer Consortium, 69120, Heidelberg, Germany.,Translational Radiation Oncology, National Center for Tumor Diseases, German Cancer Research Center, 69120, Heidelberg, Germany
| | - Steffen Greilich
- Division of Medical Physics in Radiation Oncology, German Cancer Research Center, 69120, Heidelberg, Germany.,Heidelberg Institute for Radiation Oncology, National Center for Radiation Research in Oncology, 69120, Heidelberg, Germany
| | - Gabriel O Sawakuchi
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.,Graduate School of Biomedical Sciences, The University of Texas, Houston, TX, 77030, USA
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Paganetti H, Blakely E, Carabe-Fernandez A, Carlson DJ, Das IJ, Dong L, Grosshans D, Held KD, Mohan R, Moiseenko V, Niemierko A, Stewart RD, Willers H. Report of the AAPM TG-256 on the relative biological effectiveness of proton beams in radiation therapy. Med Phys 2019; 46:e53-e78. [PMID: 30661238 DOI: 10.1002/mp.13390] [Citation(s) in RCA: 182] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 11/21/2018] [Accepted: 01/13/2019] [Indexed: 12/14/2022] Open
Abstract
The biological effectiveness of proton beams relative to photon beams in radiation therapy has been taken to be 1.1 throughout the history of proton therapy. While potentially appropriate as an average value, actual relative biological effectiveness (RBE) values may differ. This Task Group report outlines the basic concepts of RBE as well as the biophysical interpretation and mathematical concepts. The current knowledge on RBE variations is reviewed and discussed in the context of the current clinical use of RBE and the clinical relevance of RBE variations (with respect to physical as well as biological parameters). The following task group aims were designed to guide the current clinical practice: Assess whether the current clinical practice of using a constant RBE for protons should be revised or maintained. Identifying sites and treatment strategies where variable RBE might be utilized for a clinical benefit. Assess the potential clinical consequences of delivering biologically weighted proton doses based on variable RBE and/or LET models implemented in treatment planning systems. Recommend experiments needed to improve our current understanding of the relationships among in vitro, in vivo, and clinical RBE, and the research required to develop models. Develop recommendations to minimize the effects of uncertainties associated with proton RBE for well-defined tumor types and critical structures.
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Affiliation(s)
- Harald Paganetti
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Eleanor Blakely
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | | | - David J Carlson
- Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA
| | - Indra J Das
- New York University Langone Medical Center & Laura and Isaac Perlmutter Cancer Center, New York, NY, USA
| | - Lei Dong
- Department of Radiation Oncology, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - David Grosshans
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Kathryn D Held
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Radhe Mohan
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Vitali Moiseenko
- Department of Radiation Medicine and Applied Sciences, University of California San Diego, La Jolla, CA, USA
| | - Andrzej Niemierko
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Robert D Stewart
- Department of Radiation Oncology, School of Medicine, University of Washington, Seattle, WA, USA
| | - Henning Willers
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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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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7
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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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8
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Kouwenberg J, de Pooter J, Wolterbeek H, Denkova A, Bos A. Alpha radiation dosimetry using Fluorescent Nuclear Track Detectors. RADIAT MEAS 2018. [DOI: 10.1016/j.radmeas.2018.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Alsanea F, Therriault-Proulx F, Sawakuchi G, Beddar S. A real-time method to simultaneously measure linear energy transfer and dose for proton therapy using organic scintillators. Med Phys 2018; 45:1782-1789. [PMID: 29446078 DOI: 10.1002/mp.12815] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 01/18/2018] [Accepted: 02/05/2018] [Indexed: 11/05/2022] Open
Abstract
PURPOSE Currently, no detectors are capable of simultaneously measuring dose and linear energy transfer (LET) in real time. In this study, we evaluated the feasibility of exploiting the difference in the response of various organic plastic scintillation detectors to measure LET and dose in therapeutic proton beams. The hypothesis behind this work was that the ratio of the responses of different scintillators exposed to the same proton beam can be used to obtain a LET vs ratio calibration curve that can then be used to infer LET under any other measurement conditions. METHODS We first used similar scintillators with different ionization quenching factors. LET values for different irradiation conditions were calculated using a validated Monte Carlo model of the proton beam line. The quenching factors in the Birks equation for different scintillators as a function of LET were obtained from measurements in a 100-MeV pristine proton beam. We then used four different organic scintillation materials - polystyrene (BCF-12), poly (methyl methacrylate), polyvinyltoluene, and a liquid scintillator - for which the LET response varied with regard to not only quenching but also differences in material density and relative stopping power. We simultaneously exposed the four different organic scintillators and a plane-parallel ion chamber to passively scattered proton beams at fluence-averaged LET. Comparisons to the expected values obtained from the Monte Carlo simulations were made on the basis of both dose and LET. RESULTS The maximum difference in the quenching factor was 20%, resulting in a 5% change in LET with a response ratio over a range of 5 keV/μm. Among all the scintillators investigated, the ratio of PMMA to BCF-12 provided the best correlation with LET values and was therefore used to construct the LET calibration curve. The expected LET values in the validation set were within 2% ± 6%, which resulted in dose accuracy of 1.5% ± 5.8% for the range of LET values investigated in this work. CONCLUSIONS We demonstrated the feasibility of using the ratio of the light outputs of two organic scintillators to simultaneously measure LET and dose in therapeutic proton beams for fluence-averaged LET values from 0.47 to 1.26 keV/μm. Further studies are needed to verify the response for higher LET values and the reproducibility of this method.
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Affiliation(s)
- Fahed Alsanea
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.,The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX, 77030, USA
| | - Francois Therriault-Proulx
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA
| | - Gabriel Sawakuchi
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.,The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX, 77030, USA
| | - Sam Beddar
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.,The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX, 77030, USA
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Bilski P, Marczewska B, Gieszczyk W, Klosowski M, Nowak T, Naruszewicz M. LITHIUM FLUORIDE CRYSTALS AS FLUORESCENT NUCLEAR TRACK DETECTORS. RADIATION PROTECTION DOSIMETRY 2018; 178:337-340. [PMID: 28981759 DOI: 10.1093/rpd/ncx116] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Accepted: 08/03/2017] [Indexed: 06/07/2023]
Abstract
Radiophotoluminescence signal of LiF crystals was found to be sufficiently strong to visualize tracks of a single charged particle. This was achieved with a wide-field fluorescent microscope equipped with a ×100 objective and LiF single crystals grown with the Czochralski method at IFJ PAN. The tracks of alpha particles, protons, as well as products of 6Li(n,α)3H reaction with thermal neutrons (moderated Pu/Be source), were observed. These encouraging results are the first steps towards practical use of LiF as fluorescent nuclear track detectors. The most promising dosimetric application seems to be neutron measurements.
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Affiliation(s)
- P Bilski
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31 342 Kraków, Poland
| | - B Marczewska
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31 342 Kraków, Poland
| | - W Gieszczyk
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31 342 Kraków, Poland
| | - M Klosowski
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31 342 Kraków, Poland
| | - T Nowak
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31 342 Kraków, Poland
| | - M Naruszewicz
- Institute of Nuclear Physics, Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31 342 Kraków, Poland
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Anderson SE, Furutani KM, Tran LT, Chartier L, Petasecca M, Lerch M, Prokopovich DA, Reinhard M, Perevertaylo VL, Rosenfeld AB, Herman MG, Beltran C. Microdosimetric measurements of a clinical proton beam with micrometer-sized solid-state detector. Med Phys 2017; 44:6029-6037. [DOI: 10.1002/mp.12583] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 08/09/2017] [Accepted: 08/18/2017] [Indexed: 11/08/2022] Open
Affiliation(s)
- Sarah E. Anderson
- Department of Radiation Oncology; Mayo Clinic; Rochester MN 55902 USA
| | - Keith M. Furutani
- Department of Radiation Oncology; Mayo Clinic; Rochester MN 55902 USA
| | - Linh T. Tran
- Centre for Medical Radiation Physics; University of Wollongong; Wollongong NSW 2522 Australia
| | - Lachlan Chartier
- Centre for Medical Radiation Physics; University of Wollongong; Wollongong NSW 2522 Australia
| | - Marco Petasecca
- Centre for Medical Radiation Physics; University of Wollongong; Wollongong NSW 2522 Australia
| | - Michael Lerch
- Centre for Medical Radiation Physics; University of Wollongong; Wollongong NSW 2522 Australia
| | - Dale A. Prokopovich
- Institute of Materials Engineering; Australian Nuclear Science and Technology Organisation; Lucas Heights NSW 2234 Australia
| | - Mark Reinhard
- Institute of Materials Engineering; Australian Nuclear Science and Technology Organisation; Lucas Heights NSW 2234 Australia
| | | | - Anatoly B. Rosenfeld
- Centre for Medical Radiation Physics; University of Wollongong; Wollongong NSW 2522 Australia
| | - Michael G. Herman
- Department of Radiation Oncology; Mayo Clinic; Rochester MN 55902 USA
| | - Chris Beltran
- Department of Radiation Oncology; Mayo Clinic; Rochester MN 55902 USA
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12
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Niklas M, Henrich M, Jäkel O, Engelhardt J, Abdollahi A, Greilich S. STED microscopy visualizes energy deposition of single ions in a solid-state detector beyond diffraction limit. Phys Med Biol 2017; 62:N180-N190. [PMID: 28379846 DOI: 10.1088/1361-6560/aa5edc] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Fluorescent nuclear track detectors (FNTDs) allow for visualization of single-particle traversal in clinical ion beams. The point spread function of the confocal readout has so far hindered a more detailed characterization of the track spots-the ion's characteristic signature left in the FNTD. Here we report on the readout of the FNTD by optical nanoscopy, namely stimulated emission depletion microscopy. It was firstly possible to visualize the track spots of carbon ions and protons beyond the diffraction limit of conventional light microscopy with a resolving power of approximately 80 nm (confocal: 320 nm). A clear discrimination of the spatial width, defined by the full width half maximum of track spots from particles (proton and carbon ions), with a linear energy transfer (LET) ranging from approximately 2-1016 keV µm-1 was possible. Results suggest that the width depends on LET but not on particle charge within the uncertainties. A discrimination of particle type by width thus does not seem possible (as well as with confocal microscopy). The increased resolution, however, could allow for refined determination of the cross-sectional area facing substantial energy deposition. This work could pave the way towards development of optical nanoscopy-based analysis of radiation-induced cellular response using cell-fluorescent ion track hybrid detectors.
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Affiliation(s)
- M Niklas
- Molecular & Translational Radiation Oncology, National Center for Tumor Diseases (NCT), German Cancer Research Center (DKFZ), D-69120 Heidelberg, Germany. German Cancer Consortium (DKTK), D-69120 Heidelberg, Germany. Heidelberg Institute of Radiation Oncology (HIRO), German Cancer Research Center (DKFZ), D-69120 Heidelberg, Germany
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13
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Underwood TSA, Sung W, McFadden CH, McMahon SJ, Hall DC, McNamara AL, Paganetti H, Sawakuchi GO, Schuemann J. Comparing stochastic proton interactions simulated using TOPAS-nBio to experimental data from fluorescent nuclear track detectors. Phys Med Biol 2017; 62:3237-3249. [PMID: 28350546 PMCID: PMC8627280 DOI: 10.1088/1361-6560/aa6429] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Whilst Monte Carlo (MC) simulations of proton energy deposition have been well-validated at the macroscopic level, their microscopic validation remains lacking. Equally, no gold-standard yet exists for experimental metrology of individual proton tracks. In this work we compare the distributions of stochastic proton interactions simulated using the TOPAS-nBio MC platform against confocal microscope data for Al2O3:C,Mg fluorescent nuclear track detectors (FNTDs). We irradiated [Formula: see text] mm3 FNTD chips inside a water phantom, positioned at seven positions along a pristine proton Bragg peak with a range in water of 12 cm. MC simulations were implemented in two stages: (1) using TOPAS to model the beam properties within a water phantom and (2) using TOPAS-nBio with Geant4-DNA physics to score particle interactions through a water surrogate of Al2O3:C,Mg. The measured median track integrated brightness (IB) was observed to be strongly correlated to both (i) voxelized track-averaged linear energy transfer (LET) and (ii) frequency mean microdosimetric lineal energy, [Formula: see text], both simulated in pure water. Histograms of FNTD track IB were compared against TOPAS-nBio histograms of the number of terminal electrons per proton, scored in water with mass-density scaled to mimic Al2O3:C,Mg. Trends between exposure depths observed in TOPAS-nBio simulations were experimentally replicated in the study of FNTD track IB. Our results represent an important first step towards the experimental validation of MC simulations on the sub-cellular scale and suggest that FNTDs can enable experimental study of the microdosimetric properties of individual proton tracks.
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Affiliation(s)
- T S A Underwood
- Department of Radiation Oncology, Massachusetts General Hospital & Harvard Medical School, Boston, MA, United States of America. Department of Medical Engineering and Physics, University College London, London, United Kingdom
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McFadden CH, Hallacy TM, Flint DB, Granville DA, Asaithamby A, Sahoo N, Akselrod MS, Sawakuchi GO. Time-Lapse Monitoring of DNA Damage Colocalized With Particle Tracks in Single Living Cells. Int J Radiat Oncol Biol Phys 2016; 96:221-7. [DOI: 10.1016/j.ijrobp.2016.04.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 04/08/2016] [Indexed: 12/18/2022]
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