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Senirkentli GB, Ekinci F, Bostanci E, Güzel MS, Dağli Ö, Karim AM, Mishra A. Proton Therapy for Mandibula Plate Phantom. Healthcare (Basel) 2021; 9:healthcare9020167. [PMID: 33557337 PMCID: PMC7915841 DOI: 10.3390/healthcare9020167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 01/28/2021] [Accepted: 02/01/2021] [Indexed: 12/25/2022] Open
Abstract
Purpose: In this study, the required dose rates for optimal treatment of tumoral tissues when using proton therapy in the treatment of defective tumours seen in mandibles has been calculated. We aimed to protect the surrounding soft and hard tissues from unnecessary radiation as well as to prevent complications of radiation. Bragg curves of therapeutic energized protons for two different mandible (molar and premolar) plate phantoms were computed and compared with similar calculations in the literature. The results were found to be within acceptable deviation values. Methods: In this study, mandibular tooth plate phantoms were modelled for the molar and premolar areas and then a Monte Carlo simulation was used to calculate the Bragg curve, lateral straggle/range and recoil values of protons remaining in the therapeutic energy ranges. The mass and atomic densities of all the jawbone layers were selected and the effect of layer type and thickness on the Bragg curve, lateral straggle/range and the recoil were investigated. As protons move through different layers of density, lateral straggle and increases in the range were observed. A range of energies was used for the treatment of tumours at different depths in the mandible phantom. Results: Simulations revealed that as the cortical bone thickness increased, Bragg peak position decreased between 0.47–3.3%. An increase in the number of layers results in a decrease in the Bragg peak position. Finally, as the proton energy increased, the amplitude of the second peak and its effect on Bragg peak position decreased. Conclusion: These findings should guide the selection of appropriate energy levels in the treatment of tumour structures without damaging surrounding tissues.
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Affiliation(s)
| | - Fatih Ekinci
- Department of Physics, Gazi University, Ankara 06500, Turkey;
| | - Erkan Bostanci
- Computer Engineering Department, Ankara University, Ankara 06830, Turkey; (E.B.); (M.S.G.)
| | - Mehmet Serdar Güzel
- Computer Engineering Department, Ankara University, Ankara 06830, Turkey; (E.B.); (M.S.G.)
| | - Özlem Dağli
- Department of Neurosurgery Gamma Knife Unit, Gazi University, Ankara 06850, Turkey;
| | - Ahmad M. Karim
- Computer Engineering Department, Ankara Yıldırım Beyazıt University, Ankara 06830, Turkey;
| | - Alok Mishra
- Faculty of Logistics, Molde University College-Specialized University in Logistics, 6402 Molde, Norway
- Software Engineering Department, Atilim University, Ankara 06830, Turkey
- Correspondence:
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Bolst D, Guatelli S, Tran LT, Rosenfeld AB. The impact of sensitive volume thickness for silicon on insulator microdosimeters in hadron therapy. Phys Med Biol 2020; 65:035004. [PMID: 31842007 DOI: 10.1088/1361-6560/ab623f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Compact silicon on insulator (SOI) microdosimeters have been used to characterise the radiation field of many different hadron therapy beams. SOI devices are particularly attractive in hadron therapy fields due to their spatial resolution being well suited to the sharp dose gradients at the end of the primary beam's range. Due to the small size of SOI's sensitive volumes (SVs), which are usually ∼1-10 [Formula: see text]m thick, the fabrication of these devices can present challenges which are not as common for more conventional thickness silicon devices such as silicon spectroscopy detectors. Microdosimetry is the study of the energy deposition in micrometre sized volumes representing biological sites and is a powerful approach to estimate the biological effect of radiation on the micron-scale level, in a cell. However, cell sizes vary extensively translating in different energy deposition spectra. This work studies SV thicknesses between 1 and 100 [Formula: see text]m using Geant4 and examines the impact of SV dimensions on microdosimetric quantities. The quantities studied were the frequency mean lineal energy, [Formula: see text], and the dose mean lineal energy, [Formula: see text]. Additionally the relative biological effectiveness (RBE), estimated by the microdosimetric kinetic model (MKM), is also investigated. To study the impact of the SV thickness, SOI microdosimeters were irradiated with proton, [Formula: see text] and [Formula: see text] ion beams with ranges of ∼160 mm, with the microdosimeter being set at various positions along the Bragg curve. It was found that [Formula: see text] was influenced the least in proton beams and increased for heavier ion beams. Conversely, [Formula: see text] was impacted by the SV thickness the most in proton beams and [Formula: see text] was the least. Similar to [Formula: see text], protons were impacted the most by the SV thickness when estimating the RBE using the MKM. The cause of these differences was largely due to the different densities of the delta electron track structure for the case of [Formula: see text] and the energy transferred to the medium from the primary beam for [Formula: see text].
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Affiliation(s)
- D Bolst
- Author to whom any correspondence should be addressed
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3
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Vogin G, Wambersie A, Koto M, Ohno T, Uhl M, Fossati P, Balosso J. A step towards international prospective trials in carbon ion radiotherapy: investigation of factors influencing dose distribution in the facilities in operation based on a case of skull base chordoma. Radiat Oncol 2019; 14:24. [PMID: 30709366 PMCID: PMC6359776 DOI: 10.1186/s13014-019-1224-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 01/20/2019] [Indexed: 12/23/2022] Open
Abstract
Background Carbon ion radiotherapy (CIRT) has been delivered to more than 20,000 patients worldwide. International trials have been recommended in order to emphasize the actual benefits. The ULICE program (Union of Light Ion Centers in Europe) addressed the need for harmonization of CIRT practices. A comparative knowledge of the sources and magnitudes of uncertainties altering dose distribution and clinical effects during the whole CIRT procedure is required in that aim. Methods As part of ULICE WP2 task group, we sent a centrally reviewed questionnaire exploring candidate sources of uncertainties in dose deposition to the ten CIRT facilities in operation by February 2017. We aimed to explore native beam characterization, immobilization, anatomic data acquisition, target volumes and organs at risks delineation, treatment planning, dose delivery, quality assurance prior and during treatment. The responders had to consider the clinical case of a clival chordoma eligible for postoperative CIRT according to their clinical practice. With the results, our task group discussed ways to harmonize CIRT practices. Results We received 5 surveys from facilities that have treated 77% of the patients worldwide per November 2017. We pointed out the singularity of the facilities and beam delivery systems, a divergent definition of target volumes, the multiplicity of TPS and equieffective dose calculation approximations. Conclusion Multiple uncertainties affect equieffective dose definition, deposition and calculation in CIRT. Although it is not possible to harmonize all the steps of the CIRT planning between the centers, our working group proposed counter-measures addressing the improvable limitations.
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Affiliation(s)
- G Vogin
- Department of Radiation Oncology, Institut de Cancérologie de Lorraine, 6 avenue de bourgogne - CS 30519, 54519, Nancy, Vandoeuvre-les-Nancy Cedex, France. .,UMR 7365 CNRS-UL, IMoPA, Nancy, Vandoeuvre-les-Nancy Cedex, France.
| | - A Wambersie
- Institut de Recherche Expérimentale et Clinique (IREC), Molecular Imaging, Radiotherapy and Oncology (MIRO), University Clinics St Luc, Brussels, Belgium.,Université catholique de Louvain (UCL), Louvain-la-Neuve, Belgium
| | - M Koto
- Hospital of the National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Sciences and Technology, Chiba, Japan
| | - T Ohno
- Gunma University Heavy Ion Medical Center, Gunma University, Maebashi, Gunma, Japan
| | - M Uhl
- Universitätsklinik Heidelberg, Abteilung für Radioonkologie und Strahlentherapie, Heidelberg, Germany
| | - P Fossati
- EBG GmbH MedAustron, Wiener Neustadt, Austria.,Fondazione CNAO (Centro Nazionale di Adroterapia Oncologica), Pavia, Italy
| | - J Balosso
- Service de Cancérologie-Radiothérapie, Hôpital A.Michallon, CHU de Grenoble, Grenoble, France.,Université Grenoble Alpes, Grenoble, France.,Département de radiothérapie, Centre François Baclesse, Caen, France
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Augusto RS, Mohammadi A, Tashima H, Yoshida E, Yamaya T, Ferrari A, Parodi K. Experimental validation of the FLUKA Monte Carlo code for dose and [Formula: see text]-emitter predictions of radioactive ion beams. Phys Med Biol 2018; 63:215014. [PMID: 30252649 DOI: 10.1088/1361-6560/aae431] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In the context of hadrontherapy, whilst ions are capable of effectively destroying radio resistant, deep seated tumors, their treatment localization must be well assessed to ensure the sparing of surrounding healthy tissue and treatment effectiveness. Thus, range verification techniques, such as online positron-emission-tomography (PET) imaging, hold great potential in clinical practice, providing information on the in vivo beam range and consequent tumor targeting. Furthermore, [Formula: see text] emitting radioactive ions can be an asset in online PET imaging, depending on their half-life, compared to their stable counterparts. It is expected that using these radioactive ions the signal obtained by a PET apparatus during beam delivery will be greatly increased, and exhibit a better correlation to the Bragg Peak. To this end, FLUKA Monte Carlo particle transport and interaction code was used to evaluate, in terms of annihilation events at rest and dose, the figure of merit in using [Formula: see text] emitter, radioactive ion beams (RI [Formula: see text]). For this purpose, the simulation results were compared with experimental data obtained with an openPET prototype in various online PET acquisitions at the Heavy Ion Medical Accelerator in Chiba (HIMAC), in collaboration with colleagues from the National Institute of Radiological Sciences' (NIRS) Imaging Physics Team. The dosimetry performance evaluation with FLUKA benefits from its recent developments in fragmentation production models. The present work estimated that irradiations with RI [Formula: see text], produced via projectile fragmentation and their signal acquisition with state-of-the-art PET scanner, lead to nearly a factor of two more accurate definition of the signals' peak position. In addition to its more advantageous distribution shape, it was observed at least an order magnitude higher signal acquired from 11C and 15O irradiations, with respect to their stable counterparts.
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Affiliation(s)
- R S Augusto
- European Organization for Nuclear Research, Geneva, Switzerland. Ludwig-Maximilians-Universität München, Munich, Germany
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Collins-Fekete CA, Volz L, Portillo SKN, Beaulieu L, Seco J. A theoretical framework to predict the most likely ion path in particle imaging. Phys Med Biol 2017; 62:1777-1790. [DOI: 10.1088/1361-6560/aa58ce] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kitagawa A, Drentje AG, Fujita T, Muramatsu M, Fukushima K, Shiraishi N, Suzuki T, Takahashi K, Takasugi W, Biri S, Rácz R, Kato Y, Uchida T, Yoshida Y. Recent developments of ion sources for life-science studies at the Heavy Ion Medical Accelerator in Chiba (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:02C107. [PMID: 26932117 DOI: 10.1063/1.4934843] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
With about 1000-h of relativistic high-energy ion beams provided by Heavy Ion Medical Accelerator in Chiba, about 70 users are performing various biology experiments every year. A rich variety of ion species from hydrogen to xenon ions with a dose rate of several Gy/min is available. Carbon, iron, silicon, helium, neon, argon, hydrogen, and oxygen ions were utilized between 2012 and 2014. Presently, three electron cyclotron resonance ion sources (ECRISs) and one Penning ion source are available. Especially, the two frequency heating techniques have improved the performance of an 18 GHz ECRIS. The results have satisfied most requirements for life-science studies. In addition, this improved performance has realized a feasible solution for similar biology experiments with a hospital-specified accelerator complex.
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Affiliation(s)
- A Kitagawa
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
| | - A G Drentje
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
| | - T Fujita
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
| | - M Muramatsu
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
| | - K Fukushima
- Accelerator Engineering Corporation, Chiba, Japan
| | - N Shiraishi
- Accelerator Engineering Corporation, Chiba, Japan
| | - T Suzuki
- Accelerator Engineering Corporation, Chiba, Japan
| | - K Takahashi
- Accelerator Engineering Corporation, Chiba, Japan
| | - W Takasugi
- Accelerator Engineering Corporation, Chiba, Japan
| | - S Biri
- Institute for Nuclear Research (Atomki), Hungarian Academy of Sciences, Bem tér 18/C, H-4026 Debrecen, Hungary
| | - R Rácz
- Institute for Nuclear Research (Atomki), Hungarian Academy of Sciences, Bem tér 18/C, H-4026 Debrecen, Hungary
| | - Y Kato
- Graduate School of Engineering, Osaka University, Osaka, Japan
| | - T Uchida
- Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Japan
| | - Y Yoshida
- Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Japan
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Winkelmann T, Cee R, Haberer T, Naas B, Peters A, Schreiner J. Improvements for extending the time between maintenance periods for the Heidelberg ion beam therapy center (HIT) ion sources. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02A951. [PMID: 24593530 DOI: 10.1063/1.4860651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The clinical operation at the Heidelberg Ion Beam Therapy Center (HIT) started in November 2009; since then more than 1600 patients have been treated. In a 24/7 operation scheme two 14.5 GHz electron cyclotron resonance ion sources are routinely used to produce protons and carbon ions. The modification of the low energy beam transport line and the integration of a third ion source into the therapy facility will be shown. In the last year we implemented a new extraction system at all three sources to enhance the lifetime of extraction parts and reduce preventive and corrective maintenance. The new four-electrode-design provides electron suppression as well as lower beam emittance. Unwanted beam sputtering effects which typically lead to contamination of the insulator ceramics and subsequent high-voltage break-downs are minimized by the beam guidance of the new extraction system. By this measure the service interval can be increased significantly. As a side effect, the beam emittance can be reduced allowing a less challenging working point for the ion sources without reducing the effective beam performance. This paper gives also an outlook to further enhancements at the HIT ion source testbench.
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Affiliation(s)
- Tim Winkelmann
- Heidelberger Ionenstrahl-Therapie Centrum (HIT), D -69120 Heidelberg, Germany
| | - Rainer Cee
- Heidelberger Ionenstrahl-Therapie Centrum (HIT), D -69120 Heidelberg, Germany
| | - Thomas Haberer
- Heidelberger Ionenstrahl-Therapie Centrum (HIT), D -69120 Heidelberg, Germany
| | - Bernd Naas
- Heidelberger Ionenstrahl-Therapie Centrum (HIT), D -69120 Heidelberg, Germany
| | - Andreas Peters
- Heidelberger Ionenstrahl-Therapie Centrum (HIT), D -69120 Heidelberg, Germany
| | - Jochen Schreiner
- Heidelberger Ionenstrahl-Therapie Centrum (HIT), D -69120 Heidelberg, Germany
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8
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Nakagawa T. Review of highly charged heavy ion production with electron cyclotron resonance ion source (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02A935. [PMID: 24593514 DOI: 10.1063/1.4842315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The electron cyclotron resonance ion source (ECRIS) plays an important role in the advancement of heavy ion accelerators and other ion beam applications worldwide, thanks to its remarkable ability to produce a great variety of intense highly charged heavy ion beams. Great efforts over the past decade have led to significant ECRIS performance improvements in both the beam intensity and quality. A number of high-performance ECRISs have been built and are in daily operation or are under construction to meet the continuously increasing demand. In addition, comprehension of the detailed and complex physical processes in high-charge-state ECR plasmas has been enhanced experimentally and theoretically. This review covers and discusses the key components, leading-edge developments, and enhanced ECRIS performance in the production of highly charged heavy ion beams.
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Affiliation(s)
- T Nakagawa
- Nishina Center for Accelerator-Based Science, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
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Matsumoto T, Imagama S, Ito Z, Imai R, Kamada T, Shimoyama Y, Matsuyama Y, Ishiguro N. Total spondylectomy following carbon ion radiotherapy to treat chordoma of the mobile spine. Bone Joint J 2013; 95-B:1392-5. [PMID: 24078538 DOI: 10.1302/0301-620x.95b10.31269] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The main form of treatment of a chordoma of the mobile spine is total en bloc spondylectomy (TES), but the clinical results are not satisfactory. Stand-alone carbon ion radiotherapy (CIRT) for bone and soft-tissue sarcomas has recently been reported to have a high rate of local control with a low rate of local recurrence. We report two patients who underwent TES after CIRT for treating a chordoma in the lumbar spine with good medium-term outcomes. At operation, there remained histological evidence of viable tumour cells in both cases. After the combination use of TES following CIRT, neither patient showed signs of recurrence at the follow-up examination. These two cases suggest that CIRT should be combined with total spondylectomy in the treatment of chordoma of the mobile spine.
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Affiliation(s)
- T Matsumoto
- Nagoya University Graduate School of Medicine, Department of Orthopaedic Surgery, 65 Tsurumai-cho, Showa-ku, Nagoya city, Aichi 466-8550, Japan
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10
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Fletcher JD, Parkes MA, Price SD. Bond-Forming Reactions of Small Triply Charged Cations with Neutral Molecules. Chemistry 2013; 19:10965-70. [DOI: 10.1002/chem.201301861] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Indexed: 11/10/2022]
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11
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Kitagawa A, Fujita T, Goto A, Hattori T, Hamano T, Hojo S, Honma T, Imaseki H, Katagiri K, Muramatsu M, Sakamoto Y, Sekiguchi M, Suda M, Sugiura A, Suya N. Status of ion sources at National Institute of Radiological Sciences. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:02A332. [PMID: 22380179 DOI: 10.1063/1.3670742] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The National Institute of Radiological Sciences (NIRS) maintains various ion accelerators in order to study the effects of radiation of the human body and medical uses of radiation. Two electrostatic tandem accelerators and three cyclotrons delivered by commercial companies have offered various life science tools; these include proton-induced x-ray emission analysis (PIXE), micro beam irradiation, neutron exposure, and radioisotope tracers and probes. A duoplasmatron, a multicusp ion source, a penning ion source (PIG), and an electron cyclotron resonance ion source (ECRIS) are in operation for these purposes. The Heavy-Ion Medical Accelerator in Chiba (HIMAC) is an accelerator complex for heavy-ion radiotherapy, fully developed by NIRS. HIMAC is utilized not only for daily treatment with the carbon beam but also for fundamental experiments. Several ECRISs and a PIG at HIMAC satisfy various research and clinical requirements.
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Affiliation(s)
- A Kitagawa
- National Institute of Radiological Sciences (NIRS), 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
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12
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Kase Y, Himukai T, Nagano A, Tameshige Y, Minohara S, Matsufuji N, Mizoe J, Fossati P, Hasegawa A, Kanai T. Preliminary calculation of RBE-weighted dose distribution for cerebral radionecrosis in carbon-ion treatment planning. JOURNAL OF RADIATION RESEARCH 2011; 52:789-796. [PMID: 21921434 DOI: 10.1269/jrr.11044] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Cerebral radionecrosis is a significant side effect in radiotherapy for brain cancer. The purpose of this study is to calculate the relative biological effectiveness (RBE) of carbon-ion beams on brain cells and to show RBE-weighted dose distributions for cerebral radionecrosis speculation in a carbon-ion treatment planning system. The RBE value of the radionecrosis for the carbon-ion beam is calculated by the modified microdosimetric kinetic model on the assumption of a typical clinical α/β ratio of 2 Gy for cerebral radionecrosis in X-rays. This calculation method for the RBE-weighted dose is built into the treatment planning system for the carbon-ion radiotherapy. The RBE-weighted dose distributions are calculated on computed tomography (CT) images of four patients who had been treated by carbon-ion radiotherapy for astrocytoma (WHO grade 2) and who suffered from necrosis around the target areas. The necrotic areas were detected by brain scans via magnetic resonance imaging (MRI) after the treatment irradiation. The detected necrotic areas are easily found near high RBE-weighted dose regions. The visual comparison between the RBE-weighted dose distribution and the necrosis region indicates that the RBE-weighted dose distribution will be helpful information for the prediction of radionecrosis areas after carbon-ion radiotherapy.
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Affiliation(s)
- Yuki Kase
- Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba-shi, Chiba 263-8555, Japan.
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Autsavapromporn N, de Toledo SM, Little JB, Jay-Gerin JP, Harris AL, Azzam EI. The role of gap junction communication and oxidative stress in the propagation of toxic effects among high-dose α-particle-irradiated human cells. Radiat Res 2011; 175:347-57. [PMID: 21388278 PMCID: PMC3139025 DOI: 10.1667/rr2372.1] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We investigated the roles of gap junction communication and oxidative stress in modulating potentially lethal damage repair in human fibroblast cultures exposed to doses of α particles or γ rays that targeted all cells in the cultures. As expected, α particles were more effective than γ rays at inducing cell killing; further, holding γ-irradiated cells in the confluent state for several hours after irradiation promoted increased survival and decreased chromosomal damage. However, maintaining α-particle-irradiated cells in the confluent state for various times prior to subculture resulted in increased rather than decreased lethality and was associated with persistent DNA damage and increased protein oxidation and lipid peroxidation. Inhibiting gap junction communication with 18-α-glycyrrhetinic acid or by knockdown of connexin43, a constitutive protein of junctional channels in these cells, protected against the toxic effects in α-particle-irradiated cell cultures during confluent holding. Upregulation of antioxidant defense by ectopic overexpression of glutathione peroxidase protected against cell killing by α particles when cells were analyzed shortly after exposure. However, it did not attenuate the decrease in survival during confluent holding. Together, these findings indicate that the damaging effect of α particles results in oxidative stress, and the toxic effects in the hours after irradiation are amplified by intercellular communication, but the communicated molecule(s) is unlikely to be a substrate of glutathione peroxidase.
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Affiliation(s)
- Narongchai Autsavapromporn
- Department of Radiology, UMDNJ – New Jersey Medical School Cancer Center, Newark, New Jersey 07103
- Département de Médecine Nucléaire et de Radiobiologie, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, Sherbrooke (Québec) J1H 5N4, Canada
| | - Sonia M. de Toledo
- Department of Radiology, UMDNJ – New Jersey Medical School Cancer Center, Newark, New Jersey 07103
| | - John B. Little
- Laboratory of Radiobiology, Harvard School of Public Health, Boston, Massachusetts 02115
| | - Jean-Paul Jay-Gerin
- Département de Médecine Nucléaire et de Radiobiologie, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, Sherbrooke (Québec) J1H 5N4, Canada
| | - Andrew L. Harris
- Department of Pharmacology and Physiology, UMDNJ – New Jersey Medical School, Newark, New Jersey 07103
| | - Edouard I. Azzam
- Department of Radiology, UMDNJ – New Jersey Medical School Cancer Center, Newark, New Jersey 07103
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Drentje AG, Kitagawa A, Muramatsu M. Isotopic anomaly for carbon ions in an electron cyclotron resonance ion source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:02B502. [PMID: 20192439 DOI: 10.1063/1.3265342] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In many experiments methods were applied to increase the highly charged ion output from an electron cyclotron resonance ion source; the gas-mixing method is still generally being applied. The dominant role of the masses of the ions in the gas-mixture was apparent. Two basically differing mechanisms could to first order explain most of the observations. A significant mass effect showed up in a mixture of oxygen isotopes, the so-called oxygen anomaly; so far that effect could be explained in zeroth order only. The anomaly was observed later for nitrogen isotopes as well. In the present experiment it is shown that the anomaly also exists for carbon isotopes, where the necessity of feeding the source with carbon-hydrogen compounds brings about an essential different experimental fact.
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Affiliation(s)
- A G Drentje
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
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