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Suzuki S, Yagihashi T, Nitta K, Yamanaka M, Sato N, Gotoh S, Sugimoto S, Shiba S, Nagata H, Tanaka H. Evaluating optimal quality assurance and quality control conditions of activation measurements at the accelerator-based boron neutron capture therapy system employing a lithium target. Biomed Phys Eng Express 2024; 10:045028. [PMID: 38744248 DOI: 10.1088/2057-1976/ad4b1e] [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: 03/12/2024] [Accepted: 05/14/2024] [Indexed: 05/16/2024]
Abstract
Evaluating neutron output is important to ensure proper dose delivery for patients in boron neutron capture therapy (BNCT). It requires efficient quality assurance (QA) and quality control (QC) while maintaining measurement accuracy. This study investigated the optimal measurement conditions for QA/QC of activation measurements using a high-purity germanium (HP-Ge) detector in an accelerator-based boron neutron capture therapy (AB-BNCT) system employing a lithium target. The QA/QC uncertainty of the activation measurement was evaluated based on counts, reproducibility, and standard radiation source uncertainties. Measurements in a polymethyl methacrylate (PMMA) cylindrical phantom using aluminum-manganese (Al-Mn) foils and aluminum-gold (Al-Au) foils and measurements in a water phantom using gold wire with and without cadmium cover were performed to determine the optimal measurement conditions. The QA/QC uncertainties of the activation measurements were 4.5% for Au and 4.6% for Mn. The optimum irradiation proton charge and measurement time were determined to be 36 C and 900 s for measurements in a PMMA cylindrical phantom, 7.0 C and 900 s for gold wire measurements in a water phantom, and 54 C and 900 s at 0-2.2 cm depth and 3,600 s at deeper depths for gold wire measurements with cadmium cover. Our results serve as a reference for determining measurement conditions when performing QA/QC of activation measurements using HP-Ge detectors at an AB-BNCT employing a lithium target.
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Affiliation(s)
- Shunsuke Suzuki
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
- Graduate School of Engineering, Kyoto University, Kyoto University Katsura, Kyoto Nishikyo-ku, Kyoto 615-8246, Japan
| | - Takayuki Yagihashi
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
| | - Kazunori Nitta
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
| | - Masashi Yamanaka
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
| | - Naoki Sato
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
| | - Shinichi Gotoh
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
| | - Satoru Sugimoto
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
- Medical Data Mathematical Reasoning Team, Advanced Data Science Project, Information R&D and Strategy Headquarters, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Shintaro Shiba
- Department of Radiation Oncology, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
| | - Hironori Nagata
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa 247-8533, Japan
| | - Hiroki Tanaka
- Particle Radiation Oncology Research Center, Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
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Suzuki S, Nitta K, Yagihashi T, Eide P, Koivunoro H, Sato N, Gotoh S, Shiba S, Omura M, Nagata H, Tanaka H. Initial evaluation of accelerator-based neutron source system at the Shonan Kamakura General Hospital. Appl Radiat Isot 2023; 199:110898. [PMID: 37311297 DOI: 10.1016/j.apradiso.2023.110898] [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: 03/02/2023] [Revised: 05/28/2023] [Accepted: 06/07/2023] [Indexed: 06/15/2023]
Abstract
An accelerator-based boron neutron capture therapy (AB-BNCT) system was installed at the Shonan Kamakura General Hospital (SKGH). We confirmed that a stable operation was possible for 1 h at a current of 30 mA. The evaluated thermal neutron flux was 2.8 × 109 cm-2 s-1 and in good agreement (±5%) with the calculated values. The daily variation was within ±2%. The ambient dose rate due to residual radioactivity after irradiation was approximately 5 μSv/h using a lead shutter.
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Affiliation(s)
- Shunsuke Suzuki
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan; Graduate School of Engineering, Kyoto University, Kyoto University Katsura, Kyoto Nishikyo-ku, Kyoto, 615-8246, Japan.
| | - Kazunori Nitta
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan
| | - Takayuki Yagihashi
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan
| | - Paul Eide
- Neutron Therapeutics, Inc., 1 Industrial Drive, Danvers, Massachusetts, 01923, USA
| | - Hanna Koivunoro
- Neutron Therapeutics, Inc., 1 Industrial Drive, Danvers, Massachusetts, 01923, USA
| | - Naoki Sato
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan
| | - Shinichi Gotoh
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan
| | - Shintaro Shiba
- Department of Radiation Oncology, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan
| | - Motoko Omura
- Department of Radiation Oncology, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan
| | - Hironori Nagata
- Department of Medical Physics, Shonan Kamakura General Hospital, 1370-1 Okamoto, Kamakura, Kanagawa, 247-8533, Japan
| | - Hiroki Tanaka
- Particle Radiation Oncology Research Center, Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
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Hirose K, Kato T, Harada T, Motoyanagi T, Tanaka H, Takeuchi A, Kato R, Komori S, Yamazaki Y, Arai K, Kadoya N, Sato M, Takai Y. Determining a methodology of dosimetric quality assurance for commercially available accelerator-based boron neutron capture therapy system. JOURNAL OF RADIATION RESEARCH 2022; 63:620-635. [PMID: 35726375 PMCID: PMC9303606 DOI: 10.1093/jrr/rrac030] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 01/20/2021] [Indexed: 06/15/2023]
Abstract
The irradiation field of boron neutron capture therapy (BNCT) consists of multiple dose components including thermal, epithermal and fast neutron, and gamma. The objective of this work was to establish a methodology of dosimetric quality assurance (QA), using the most standard and reliable measurement methods, and to determine tolerance level for each QA measurement for a commercially available accelerator-based BNCT system. In order to establish a system of dosimetric QA suitable for BNCT, the following steps were taken. First, standard measurement points based on tissue-administered doses in BNCT for brain tumors were defined, and clinical tolerances of dosimetric QA measurements were derived from the contribution to total tissue relative biological effectiveness factor-weighted dose for each dose component. Next, a QA program was proposed based on TG-142 and TG-198, and confirmed that it could be assessed whether constancy of each dose component was assured within the limits of tolerances or not by measurements of the proposed QA program. Finally, the validity of the BNCT QA program as an evaluation system was confirmed in a demonstration experiment for long-term measurement over 1 year. These results offer an easy, reliable QA method that is clinically applicable with dosimetric validity for the mixed irradiation field of accelerator-based BNCT.
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Affiliation(s)
- Katsumi Hirose
- Corresponding author. Southern Tohoku BNCT Research Center, 7-10 Yatsuyamada, Koriyama, 963-8052 Japan, Tel: +81-24-934-5330,
| | - Takahiro Kato
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
- Department of Radiation Oncology, Southern Tohoku Proton Therapy Center, 7-172 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
- School of Health Sciences, Fukushima Medical University, 10-6 Sakaemachi, Fukushima 960-8516, Japan
| | - Takaomi Harada
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
| | - Tomoaki Motoyanagi
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
| | - Hiroki Tanaka
- Particle Radiation Oncology Research Center, Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2 Asashiro-nisi, Sennan-gun, Osaka 590-0494, Japan
| | - Akihiko Takeuchi
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
| | - Ryohei Kato
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
| | - Shinya Komori
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
| | - Yuhei Yamazaki
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
| | - Kazuhiro Arai
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
- Department of Radiation Oncology, Southern Tohoku Proton Therapy Center, 7-172 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
| | - Noriyuki Kadoya
- Department of Radiation Oncology, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan
| | - Mariko Sato
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
- Department of Radiology and Radiation Oncology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori 036-8562, Japan
| | - Yoshihiro Takai
- Department of Radiation Oncology, Southern Tohoku BNCT Research Center and Southern Tohoku General Hospital, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
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Yu H, Tang X, Shu D, Liu Y, Geng C, Gong C, Hang S, Chen D. Influence of Neutron Sources and 10B Concentration on Boron Neutron Capture Therapy for Shallow and Deeper Non-small Cell Lung Cancer. HEALTH PHYSICS 2017; 112:258-265. [PMID: 28121726 DOI: 10.1097/hp.0000000000000601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Boron Neutron Capture Therapy (BNCT) is a radiotherapy that combines biological targeting and high Linear Energy Transfer (LET). It is considered a potential therapeutic approach for non-small cell lung cancer (NSCLC). It could avoid the inaccurate treatment caused by the lung motion during radiotherapy, because the dose deposition mainly depends on the boron localization and neutron source. Thus, B concentration and neutron sources are both principal factors of BNCT, and they play significant roles in the curative effect of BNCT for different cases. The purpose was to explore the feasibility of BNCT treatment for NSCLC with either of two neutron sources (the epithermal reactor at the Massachusetts Institute of Technology named "MIT source" and the accelerator neutron source designed in Argentina named "MEC source") and various boron concentrations. Shallow and deeper lung tumors were defined in the Chinese hybrid radiation phantom, and the Monte Carlo method was used to calculate the dose to tumors and healthy organs. The MEC source was more appropriate to treat the shallow tumor (depth of 6 cm) with a shorter treatment time. However, the MIT source was more suitable for deep lung tumor (depth of 9 cm) treatment, as the MEC source is more likely to exceed the skin dose limit. Thus, a neutron source consisting of more fast neutrons is not necessarily suitable for deep treatment of lung tumors. Theoretical distribution of B in tumors and organs at risk (especially skin) was obtained to meet the treatable requirement of BNCT, which may provide the references to identify the feasibility of BNCT for the treatment of lung cancer using these two neutron sources in future clinical applications.
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Affiliation(s)
- Haiyan Yu
- *Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, 210016 Nanjing, China; †Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 29 Yudao Street, 210016 Nanjing, China; ‡Department of Radiation Oncology, Massachusetts General Hospital, Boston, MA 02114
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The FiR 1 photon beam model adjustment according to in-air spectrum measurements with the Mg(Ar) ionization chamber. Appl Radiat Isot 2014; 88:134-8. [PMID: 24588987 DOI: 10.1016/j.apradiso.2014.01.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Revised: 01/24/2014] [Accepted: 01/28/2014] [Indexed: 11/24/2022]
Abstract
The mixed neutron-photon beam of FiR 1 reactor is used for boron-neutron capture therapy (BNCT) in Finland. A beam model has been defined for patient treatment planning and dosimetric calculations. The neutron beam model has been validated with an activation foil measurements. The photon beam model has not been thoroughly validated against measurements, due to the fact that the beam photon dose rate is low, at most only 2% of the total weighted patient dose at FiR 1. However, improvement of the photon dose detection accuracy is worthwhile, since the beam photon dose is of concern in the beam dosimetry. In this study, we have performed ionization chamber measurements with multiple build-up caps of different thickness to adjust the calculated photon spectrum of a FiR 1 beam model.
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Koivunoro H, Siiskonen T, Kotiluoto P, Auterinen I, Hippelainen E, Savolainen S. Accuracy of the electron transport in mcnp5 and its suitability for ionization chamber response simulations: A comparison with the egsnrc and penelope codes. Med Phys 2013; 39:1335-44. [PMID: 22380366 DOI: 10.1118/1.3685446] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE In this work, accuracy of the mcnp5 code in the electron transport calculations and its suitability for ionization chamber (IC) response simulations in photon beams are studied in comparison to egsnrc and penelope codes. METHODS The electron transport is studied by comparing the depth dose distributions in a water phantom subdivided into thin layers using incident energies (0.05, 0.1, 1, and 10 MeV) for the broad parallel electron beams. The IC response simulations are studied in water phantom in three dosimetric gas materials (air, argon, and methane based tissue equivalent gas) for photon beams ((60)Co source, 6 MV linear medical accelerator, and mono-energetic 2 MeV photon source). Two optional electron transport models of mcnp5 are evaluated: the ITS-based electron energy indexing (mcnp5(ITS)) and the new detailed electron energy-loss straggling logic (mcnp5(new)). The electron substep length (ESTEP parameter) dependency in mcnp5 is investigated as well. RESULTS For the electron beam studies, large discrepancies (>3%) are observed between the MCNP5 dose distributions and the reference codes at 1 MeV and lower energies. The discrepancy is especially notable for 0.1 and 0.05 MeV electron beams. The boundary crossing artifacts, which are well known for the mcnp5(ITS), are observed for the mcnp5(new) only at 0.1 and 0.05 MeV beam energies. If the excessive boundary crossing is eliminated by using single scoring cells, the mcnp5(ITS) provides dose distributions that agree better with the reference codes than mcnp5(new). The mcnp5 dose estimates for the gas cavity agree within 1% with the reference codes, if the mcnp5(ITS) is applied or electron substep length is set adequately for the gas in the cavity using the mcnp5(new). The mcnp5(new) results are found highly dependent on the chosen electron substep length and might lead up to 15% underestimation of the absorbed dose. CONCLUSIONS Since the mcnp5 electron transport calculations are not accurate at all energies and in every medium by general clinical standards, caution is needed, if mcnp5 is used with the current electron transport models for dosimetric applications.
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Savolainen S, Kortesniemi M, Timonen M, Reijonen V, Kuusela L, Uusi-Simola J, Salli E, Koivunoro H, Seppälä T, Lönnroth N, Välimäki P, Hyvönen H, Kotiluoto P, Serén T, Kuronen A, Heikkinen S, Kosunen A, Auterinen I. Boron neutron capture therapy (BNCT) in Finland: technological and physical prospects after 20 years of experiences. Phys Med 2012; 29:233-48. [PMID: 22613369 DOI: 10.1016/j.ejmp.2012.04.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Revised: 04/17/2012] [Accepted: 04/24/2012] [Indexed: 01/18/2023] Open
Abstract
Boron Neutron Capture Therapy (BNCT) is a binary radiotherapy method developed to treat patients with certain malignant tumours. To date, over 300 treatments have been carried out at the Finnish BNCT facility in various on-going and past clinical trials. In this technical review, we discuss our research work in the field of medical physics to form the groundwork for the Finnish BNCT patient treatments, as well as the possibilities to further develop and optimize the method in the future. Accordingly, the following aspects are described: neutron sources, beam dosimetry, treatment planning, boron imaging and determination, and finally the possibilities to detect the efficacy and effects of BNCT on patients.
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