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Shamsabadi R, Baghani HR. DNA-damage RBE assessment for combined boron and gadolinium neutron capture therapy. J Appl Clin Med Phys 2024; 25:e14399. [PMID: 38767333 PMCID: PMC11244684 DOI: 10.1002/acm2.14399] [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: 09/20/2023] [Revised: 04/17/2024] [Accepted: 04/25/2024] [Indexed: 05/22/2024] Open
Abstract
PURPOSE Neutron capture therapy (NCT) by 10B and 157Gd agents is a unique irradiation-based method which can be used to treat brain tumors. Current study aims to quantitatively evaluate the relative biological effectiveness (RBE) and dose distributions during the combined BNCT and GdNCT modalities through a hybrid Monte Carlo (MC) simulation approach. METHODS Snyder head phantom as well as a cubic hypothetical tumor was at first modeled by Geant4 MC Code. Then, the energy spectra and dose distribution relevant to the released secondary particles during the combined Gd/BNCT were scored for different concentrations of 157Gd and 10B inside tumor volume. Finally, the scored energy spectra were imported to the MCDS code to estimate both RBESSB and RBEDSB values for different 157Gd concentrations. RESULTS The results showed that combined Gd/BNCT increases the fluence-averaged RBESSB values by about 1.7 times when 157Gd concentration increments from 0 to 2000 µg/g for both considered cell oxygen levels (pO2 = 10% and 100%). Besides, a reduction of about 26% was found for fluence-averaged RBEDSB values with an increment of 157Gd concentration in tumor volume. CONCLUSION From the results, it can be concluded that combined Gd/BNCT technique can improve tumor coverage with higher dose levels but in the expense of RBEDSB reduction which can affect the clinical efficacy of the NCT technique.
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Affiliation(s)
- Reza Shamsabadi
- Physics Department, Hakim Sabzevari University, Sabzevar, Iran
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2
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Fuentealba M, Ferreira A, Salgado A, Vergara C, Díez S, Santibáñez M. An Optimized Method for Evaluating the Potential Gd-Nanoparticle Dose Enhancement Produced by Electronic Brachytherapy. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:430. [PMID: 38470761 DOI: 10.3390/nano14050430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 01/08/2024] [Accepted: 01/11/2024] [Indexed: 03/14/2024]
Abstract
This work reports an optimized method to experimentally quantify the Gd-nanoparticle dose enhancement generated by electronic brachytherapy. The dose enhancement was evaluated considering energy beams of 50 kVp and 70 kVp, determining the Gd-nanoparticle concentration ranges that would optimize the process for each energy. The evaluation was performed using delaminated radiochromic films and a Poly(methyl methacrylate) (PMMA) phantom covered on one side by a thin 2.5 μm Mylar filter acting as an interface between the region with Gd suspension and the radiosensitive film substrate. The results for the 70 kVp beam quality showed dose increments of 6±6%, 22±7%, and 9±7% at different concentrations of 10, 20, and 30 mg/mL, respectively, verifying the competitive mechanisms of enhancement and attenuation. For the 50 kVp beam quality, no increase in dose was recorded for the concentrations studied, indicating that the major contribution to enhancement is from the K-edge interaction. In order to separate the contributions of attenuation and enhancement to the total dose, measurements were replicated with a 12 μm Mylar filter, obtaining a dose enhancement attributable to the K-edge of 29±7% and 34±7% at 20 and 30 mg/mL, respectively, evidencing a significant additional dose proportional to the Gd concentration.
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Affiliation(s)
- Melani Fuentealba
- Departamento de Cs. Físicas, Universidad de La Frontera, Temuco 4811230, Chile
- Laboratorio de Radiaciones Ionizantes, Universidad de La Frontera, Temuco 4811230, Chile
- Departamento de Fisiología, Universitat de Valencia, 46010 Valencia, Spain
| | - Alejandro Ferreira
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago 7510602, Chile
| | | | - Christopher Vergara
- Departamento de Cs. Físicas, Universidad de La Frontera, Temuco 4811230, Chile
- Laboratorio de Radiaciones Ionizantes, Universidad de La Frontera, Temuco 4811230, Chile
| | - Sergio Díez
- Departamento de Fisiología, Universitat de Valencia, 46010 Valencia, Spain
- Medical Physics Department, Hospital Clínico Universitario de Valencia, 46010 Valencia, Spain
| | - Mauricio Santibáñez
- Departamento de Cs. Físicas, Universidad de La Frontera, Temuco 4811230, Chile
- Laboratorio de Radiaciones Ionizantes, Universidad de La Frontera, Temuco 4811230, Chile
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Experimental characterization and Monte Carlo simulations of the dose enhancement on the millimeter scale of PAGAT infused with gadolinium. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2021.109533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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4
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Dombrowsky AC, Burger K, Porth AK, Stein M, Dierolf M, Günther B, Achterhold K, Gleich B, Feuchtinger A, Bartzsch S, Beyreuther E, Combs SE, Pfeiffer F, Wilkens JJ, Schmid TE. A proof of principle experiment for microbeam radiation therapy at the Munich compact light source. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2020; 59:111-120. [PMID: 31655869 DOI: 10.1007/s00411-019-00816-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 10/14/2019] [Indexed: 06/10/2023]
Abstract
Microbeam radiation therapy (MRT), a preclinical form of spatially fractionated radiotherapy, uses an array of microbeams of hard synchrotron X-ray radiation. Recently, compact synchrotron X-ray sources got more attention as they provide essential prerequisites for the translation of MRT into clinics while overcoming the limited access to synchrotron facilities. At the Munich compact light source (MuCLS), one of these novel compact X-ray facilities, a proof of principle experiment was conducted applying MRT to a xenograft tumor mouse model. First, subcutaneous tumors derived from the established squamous carcinoma cell line FaDu were irradiated at a conventional X-ray tube using broadbeam geometry to determine a suitable dose range for the tumor growth delay. For irradiations at the MuCLS, FaDu tumors were irradiated with broadbeam and microbeam irradiation at integral doses of either 3 Gy or 5 Gy and tumor growth delay was measured. Microbeams had a width of 50 µm and a center-to-center distance of 350 µm with peak doses of either 21 Gy or 35 Gy. A dose rate of up to 5 Gy/min was delivered to the tumor. Both doses and modalities delayed the tumor growth compared to a sham-irradiated tumor. The irradiated area and microbeam pattern were verified by staining of the DNA double-strand break marker γH2AX. This study demonstrates for the first time that MRT can be successfully performed in vivo at compact inverse Compton sources.
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Affiliation(s)
- Annique C Dombrowsky
- Institute of Radiation Medicine, Helmholtz Zentrum München GmbH, 85764, Neuherberg, Germany
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
| | - Karin Burger
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, 85748, Garching, Germany
- Munich School of BioEngineering, Technical University of Munich, 85748, Garching, Germany
| | - Ann-Kristin Porth
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
| | - Marlon Stein
- Institute of Radiation Medicine, Helmholtz Zentrum München GmbH, 85764, Neuherberg, Germany
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
| | - Martin Dierolf
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, 85748, Garching, Germany
- Munich School of BioEngineering, Technical University of Munich, 85748, Garching, Germany
| | - Benedikt Günther
- Munich School of BioEngineering, Technical University of Munich, 85748, Garching, Germany
| | - Klaus Achterhold
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, 85748, Garching, Germany
- Munich School of BioEngineering, Technical University of Munich, 85748, Garching, Germany
| | - Bernhard Gleich
- Munich School of BioEngineering, Technical University of Munich, 85748, Garching, Germany
| | - Annette Feuchtinger
- Research Unit Analytical Pathology, Helmholtz Zentrum München GmbH, 85764, Neuherberg, Germany
| | - Stefan Bartzsch
- Institute of Radiation Medicine, Helmholtz Zentrum München GmbH, 85764, Neuherberg, Germany
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
| | - Elke Beyreuther
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- OncoRay, National Center for Radiation Research in Oncology, Faculty of Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Stephanie E Combs
- Institute of Radiation Medicine, Helmholtz Zentrum München GmbH, 85764, Neuherberg, Germany
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
- German Consortium for Translational Cancer Research, Deutsches Konsortium für Translationale Krebsforschung (dktk), Technical University Munich, 81675, Munich, Germany
| | - Franz Pfeiffer
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, 85748, Garching, Germany
- Munich School of BioEngineering, Technical University of Munich, 85748, Garching, Germany
- Department of Diagnostic and Interventional Radiobiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
| | - Jan J Wilkens
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, 85748, Garching, Germany
| | - Thomas E Schmid
- Institute of Radiation Medicine, Helmholtz Zentrum München GmbH, 85764, Neuherberg, Germany.
- Department of Radiation Oncology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, 81675, Munich, Germany.
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Bartzsch S, Corde S, Crosbie JC, Day L, Donzelli M, Krisch M, Lerch M, Pellicioli P, Smyth LML, Tehei M. Technical advances in x-ray microbeam radiation therapy. Phys Med Biol 2020; 65:02TR01. [PMID: 31694009 DOI: 10.1088/1361-6560/ab5507] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In the last 25 years microbeam radiation therapy (MRT) has emerged as a promising alternative to conventional radiation therapy at large, third generation synchrotrons. In MRT, a multi-slit collimator modulates a kilovoltage x-ray beam on a micrometer scale, creating peak dose areas with unconventionally high doses of several hundred Grays separated by low dose valley regions, where the dose remains well below the tissue tolerance level. Pre-clinical evidence demonstrates that such beam geometries lead to substantially reduced damage to normal tissue at equal tumour control rates and hence drastically increase the therapeutic window. Although the mechanisms behind MRT are still to be elucidated, previous studies indicate that immune response, tumour microenvironment, and the microvasculature may play a crucial role. Beyond tumour therapy, MRT has also been suggested as a microsurgical tool in neurological disorders and as a primer for drug delivery. The physical properties of MRT demand innovative medical physics and engineering solutions for safe treatment delivery. This article reviews technical developments in MRT and discusses existing solutions for dosimetric validation, reliable treatment planning and safety. Instrumentation at synchrotron facilities, including beam production, collimators and patient positioning systems, is also discussed. Specific solutions reviewed in this article include: dosimetry techniques that can cope with high spatial resolution, low photon energies and extremely high dose rates of up to 15 000 Gy s-1, dose calculation algorithms-apart from pure Monte Carlo Simulations-to overcome the challenge of small voxel sizes and a wide dynamic dose-range, and the use of dose-enhancing nanoparticles to combat the limited penetrability of a kilovoltage energy spectrum. Finally, concepts for alternative compact microbeam sources are presented, such as inverse Compton scattering set-ups and carbon nanotube x-ray tubes, that may facilitate the transfer of MRT into a hospital-based clinical environment. Intensive research in recent years has resulted in practical solutions to most of the technical challenges in MRT. Treatment planning, dosimetry and patient safety systems at synchrotrons have matured to a point that first veterinary and clinical studies in MRT are within reach. Should these studies confirm the promising results of pre-clinical studies, the authors are confident that MRT will become an effective new radiotherapy option for certain patients.
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Affiliation(s)
- Stefan Bartzsch
- Department of Radiation Oncology, School of Medicine, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany. Helmholtz Centre Munich, Institute for Radiation Medicine, Munich, Germany
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Keshavarz S, Sardari D. Different distributions of gold nanoparticles on the tumor and calculation of dose enhancement factor by Monte Carlo simulation. NUCLEAR ENERGY AND TECHNOLOGY 2019. [DOI: 10.3897/nucet.5.39096] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Gold nanoparticles can be used to increase the dose of the tumor due to its high atomic number as well as being free from apparent toxicity. The aim of this study is to evaluate the effect of distribution of gold nanoparticles models, as well as changes in nanoparticle sizes and spectrum of radiation energy along with the effects of nanoparticle penetration into surrounding tissues in dose enhancement factor DEF. Three mathematical models were considered for distribution of gold nanoparticles in the tumor, such as 1-uniform, 2- non-uniform distribution with no penetration margin and 3- non-uniform distribution with penetration margin of 2.7 mm of gold nanoparticles. For this purpose, a cube-shaped water phantom of 50 cm size in each side and a cube with 1 cm side placed at depth of 2 cm below the upper surface of the cubic phantom as the tumor was defined, and then 3 models of nanoparticle distribution were modeled. MCNPX code was used to simulate 3 distribution models. DEF was evaluated for sizes of 20, 25, 30, 50, 70, 90 and 100 nm of gold nanoparticles, and 50, 95, 250 keV and 4 MeV photon energies. In uniform distribution model the maximum DEF was observed at 100 nm and 50 keV being equal to 2.90, in non-uniform distribution with no penetration margin, the maximum DEF was measured at 100 nm and 50 keV being 1.69, and in non-uniform distribution with penetration margin of 2.7 mm, the maximum DEF was measured at 100 nm and 50 keV as 1.38, and the results have been showed that the dose was increased by injecting nanoparticles into the tumor. It is concluded that the highest DEF could be achieved in low energy photons and larger sizes of nanoparticles. Non-uniform distribution of gold nanoparticles can increase the dose and also decrease the DEF in comparison with the uniform distribution. The non-uniform distribution of nanoparticles with penetration margin showed a lower DEF than the non-uniform distribution without any margin and uniform distribution. Meanwhile, utilization of the real X-ray spectrum brought about a smaller DEF in comparison to mono-energetic X-ray photons.
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Spiga J, Pellicioli P, Manger SP, Duffy JA, Bravin A. Experimental benchmarking of Monte Carlo simulations for radiotherapy dosimetry using monochromatic X-ray beams in the presence of metal-based compounds. Phys Med 2019; 66:45-54. [DOI: 10.1016/j.ejmp.2019.09.075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 08/03/2019] [Accepted: 09/11/2019] [Indexed: 10/25/2022] Open
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8
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Santibáñez M, Fuentealba M, Torres F, Vargas A. Experimental determination of the gadolinium dose enhancement in phantom irradiated with low energy X-ray sources by a spectrophotometer -Gafchromic-EBT3 dosimetry system. Appl Radiat Isot 2019; 154:108857. [PMID: 31434044 DOI: 10.1016/j.apradiso.2019.108857] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 08/10/2019] [Accepted: 08/12/2019] [Indexed: 01/22/2023]
Abstract
This work reports the experimental determination of dose enhancement produced in phantoms containing target volumes doped with Gadolinium and irradiated with low-energy X-ray beams. EBT3 Gafchromic films were immersed into 5 ml target volumes to simulate tumor filling with 100% ultra-pure water (blank sample) and ultra-pure water infused with Gd solution (Omniscan®) in different concentration (9-24 mg/ml). The dose enhancement due to excitation of Gd K-edge (50.2 keV) was evaluated in terms of the increment in optical density, obtained by a Spectrophotometer-Gafchromic-EBT3 dosimetry system calibrated in terms of the dose-response for 1-8 Gy range. The dose enhancement was evaluated in two condition: a beam quality with spectrum above the absorption edge in a medium with and without Gd; and two beam qualities (above and below the absorption edge) in a medium with a fixed Gd concentration (18 mg/ml). The obtained results confirmed increments in relative dose enhancement according to Gd concentrations up to 18 mg/ml, with a dose enhancement of 1.1 Gy and an average percentage enhancement of 28.4%. For higher values of concentration, the attenuation interaction of the primary beam is more relevant instead of dose enhancement process. On the other hand, the dose enhancement obtained to comparison the spectra above and below the absorption edge, shown results up to 3.3 Gy of enhancement and average percentage enhancement of 88%.
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Affiliation(s)
- M Santibáñez
- Departamento de Ciencias Físicas, Universidad de La Frontera, F. Salazar, 01145, Temuco, Chile; Centro de Física e Ingeniería en Medicina (CFIM), Facultad de Ingenieria y Ciencias, Universidad de La Frontera, Temuco, Chile.
| | - M Fuentealba
- Departamento de Ciencias Físicas, Universidad de La Frontera, F. Salazar, 01145, Temuco, Chile
| | - F Torres
- Departamento de Ciencias Físicas, Universidad de La Frontera, F. Salazar, 01145, Temuco, Chile
| | - A Vargas
- Departamento de Ciencias Físicas, Universidad de La Frontera, F. Salazar, 01145, Temuco, Chile
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Gérard M, Corroyer-Dulmont A, Lesueur P, Collet S, Chérel M, Bourgeois M, Stefan D, Limkin EJ, Perrio C, Guillamo JS, Dubray B, Bernaudin M, Thariat J, Valable S. Hypoxia Imaging and Adaptive Radiotherapy: A State-of-the-Art Approach in the Management of Glioma. Front Med (Lausanne) 2019; 6:117. [PMID: 31249831 PMCID: PMC6582242 DOI: 10.3389/fmed.2019.00117] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 05/13/2019] [Indexed: 01/31/2023] Open
Abstract
Severe hypoxia [oxygen partial pressure (pO2) below 5–10 mmHg] is more frequent in glioblastoma multiforme (GBM) compared to lower-grade gliomas. Seminal studies in the 1950s demonstrated that hypoxia was associated with increased resistance to low–linear energy transfer (LET) ionizing radiation. In experimental conditions, the total radiation dose has to be multiplied by a factor of 3 to achieve the same cell lethality in anoxic situations. The presence of hypoxia in human tumors is assumed to contribute to treatment failures after radiotherapy (RT) in cancer patients. Therefore, a logical way to overcome hypoxia-induced radioresistance would be to deliver substantially higher doses of RT in hypoxic volumes delineated on pre-treatment imaging as biological target volumes (BTVs). Such an approach faces various fundamental, technical, and clinical challenges. The present review addresses several technical points related to the delineation of hypoxic zones, which include: spatial accuracy, quantitative vs. relative threshold, variations of hypoxia levels during RT, and availability of hypoxia tracers. The feasibility of hypoxia imaging as an assessment tool for early tumor response to RT and for predicting long-term outcomes is discussed. Hypoxia imaging for RT dose painting is likewise examined. As for the radiation oncologist's point of view, hypoxia maps should be converted into dose-distribution objectives for RT planning. Taking into account the physics and the radiobiology of various irradiation beams, preliminary in silico studies are required to investigate the feasibility of dose escalation in terms of normal tissue tolerance before clinical trials are undertaken.
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Affiliation(s)
- Michael Gérard
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | | | - Paul Lesueur
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Solène Collet
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Radiophysics, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Michel Chérel
- Team 13-Nuclear Oncology, INSERM U1232 Centre de Recherche en Cancérologie et Immunologie Nantes Angers (CRCINA), Nantes, France
| | - Mickael Bourgeois
- Team 13-Nuclear Oncology, INSERM U1232 Centre de Recherche en Cancérologie et Immunologie Nantes Angers (CRCINA), Nantes, France
| | - Dinu Stefan
- Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Elaine Johanna Limkin
- Department of Radiotherapy, Gustave Roussy, Université Paris-Saclay, Villejuif, France
| | - Cécile Perrio
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/LDM-TEP Group, GIP Cyceron, Caen, France
| | - Jean-Sébastien Guillamo
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France.,Department of Neurology, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
| | - Bernard Dubray
- Département de Radiothérapie et de Physique Médicale, Laboratoire QuantIF-LITIS [EA 4108], Centre de Lutte Contre le Cancer Henri Becquerel, Université de Normandie, Rouen, France
| | - Myriam Bernaudin
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France
| | - Juliette Thariat
- Department of Radiation Oncology, Centre Lutte Contre le Cancer François Baclesse, Caen, France
| | - Samuel Valable
- Normandie Université, UNICAEN, CEA, CNRS, ISTCT/CERVOxy Group, GIP Cyceron, Caen, France
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Identifying optimal clinical scenarios for synchrotron microbeam radiation therapy: A treatment planning study. Phys Med 2019; 60:111-119. [DOI: 10.1016/j.ejmp.2019.03.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 02/20/2019] [Accepted: 03/19/2019] [Indexed: 12/25/2022] Open
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11
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Feasibility of dose enhancement assessment: Preliminary results by means of Gd-infused polymer gel dosimeter and Monte Carlo study. Appl Radiat Isot 2018; 141:210-218. [PMID: 29678602 DOI: 10.1016/j.apradiso.2018.04.016] [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: 12/15/2017] [Revised: 03/22/2018] [Accepted: 04/05/2018] [Indexed: 11/23/2022]
Abstract
This work reports the experimental development of an integral Gd-infused dosimeter suitable for Gd dose enhancement assessment along with Monte Carlo simulations applied to determine the dose enhancement by radioactive and X-ray sources of interest in conventional and electronic brachytherapy. In this context, capability to elaborate a stable and reliable Gd-infused dosimeter was the first goal aimed at direct and accurate measurements of dose enhancement due to Gd presence. Dose-response was characterized for standard and Gd-infused PAGAT polymer gel dosimeters by means of optical transmission/absorbance. The developed Gd-infused PAGAT dosimeters demonstrated to be stable presenting similar dose-response as standard PAGAT within a linear trend up to 13 Gy along with good post-irradiation readout stability verified at 24 and 48 h. Additionally, dose enhancement was evaluated for Gd-infused PAGAT dosimeters by means of Monte Carlo (PENELOPE) simulations considering scenarios for isotopic and X-ray generator sources. The obtained results demonstrated the feasibility of obtaining a maximum enhancement around of (14 ± 1)% for 192Ir source and an average enhancement of (70 ± 13)% for 241Am. However, dose enhancement up to (267 ± 18)% may be achieved if suitable filtering is added to the 241Am source. On the other hand, optimized X-ray spectra may attain dose enhancements up to (253 ± 22) %, which constitutes a promising future alternative for replacing radioactive sources by implementing electronic brachytherapy achieving high dose levels.
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12
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Livingstone J, Stevenson AW, Häusermann D, Adam JF. Experimental optimisation of the X-ray energy in microbeam radiation therapy. Phys Med 2017; 45:156-161. [PMID: 29472081 DOI: 10.1016/j.ejmp.2017.12.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 12/18/2017] [Accepted: 12/23/2017] [Indexed: 11/30/2022] Open
Abstract
Microbeam radiation therapy has demonstrated superior normal tissue sparing properties compared to broadbeam radiation fields. The ratio of the microbeam peak dose to the valley dose (PVDR), which is dependent on the X-ray energy/spectrum and geometry, should be maximised for an optimal therapeutic ratio. Simulation studies in the literature report the optimal energy for MRT based on the PVDR. However, most of these studies have considered different microbeam geometries to that at the Imaging and Medical Beamline (50 μm beam width with a spacing of 400 μm). We present the first fully experimental investigation of the energy dependence of PVDR and microbeam penumbra. Using monochromatic X-ray energies in the range 40-120 keV the PVDR was shown to increase with increasing energy up to 100 keV before plateauing. PVDRs measured for pink beams were consistently higher than those for monochromatic energies similar or equivalent to the average energy of the spectrum. The highest PVDR was found for a pink beam average energy of 124 keV. Conversely, the microbeam penumbra decreased with increasing energy before plateauing for energies above 90 keV. The effect of bone on the PVDR was investigated at energies 60, 95 and 120 keV. At depths greater than 20 mm beyond the bone/water interface there was almost no effect on the PVDR. In conclusion, the optimal energy range for MRT at IMBL is 90-120 keV, however when considering the IMBL flux at different energies, a spectrum with 95 keV weighted average energy was found to be the best compromise.
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Affiliation(s)
- Jayde Livingstone
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, Victoria, Australia.
| | - Andrew W Stevenson
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, Victoria, Australia
| | - Daniel Häusermann
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, Victoria, Australia
| | - Jean-François Adam
- Equipe d'accueil Rayonnement Synchrotron et Recherche Médicale, Université Grenoble-Alpes, Grenoble, France; Centre Hospitalier Universitaire de Grenoble, Grenoble, France
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Lin H, Jing J, Xu L, Mao X. Monte Carlo study of the influence of energy spectra, mesh size, high Z element on dose and PVDR based on 1-D and 3-D heterogeneous mouse head phantom for Microbeam Radiation Therapy. Phys Med 2017; 44:96-107. [DOI: 10.1016/j.ejmp.2017.07.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 07/05/2017] [Accepted: 07/07/2017] [Indexed: 12/01/2022] Open
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Lee E, Meyer J, Sandison G. Collimator design for spatially-fractionated proton beams for radiobiology research. Phys Med Biol 2016; 61:5378-89. [DOI: 10.1088/0031-9155/61/14/5378] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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15
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Zygmanski P, Sajo E. Nanoscale radiation transport and clinical beam modeling for gold nanoparticle dose enhanced radiotherapy (GNPT) using X-rays. Br J Radiol 2015; 89:20150200. [PMID: 26642305 PMCID: PMC4986475 DOI: 10.1259/bjr.20150200] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 11/17/2015] [Accepted: 12/01/2015] [Indexed: 11/05/2022] Open
Abstract
We review radiation transport and clinical beam modelling for gold nanoparticle dose-enhanced radiotherapy using X-rays. We focus on the nanoscale radiation transport and its relation to macroscopic dosimetry for monoenergetic and clinical beams. Among other aspects, we discuss Monte Carlo and deterministic methods and their applications to predicting dose enhancement using various metrics.
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Affiliation(s)
- Piotr Zygmanski
- Department of Radiation Oncology, Brigham and Women's Hospital, Dana-Farber Cancer Institute, and Harvard Medical School, Boston, MA, USA
| | - Erno Sajo
- Department of Physics and Applied Physics, University of Massachusetts Lowell, Medical Physics Program, Lowell, MA, USA
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Monte Carlo study of radiation dose enhancement by gadolinium in megavoltage and high dose rate radiotherapy. PLoS One 2014; 9:e109389. [PMID: 25275550 PMCID: PMC4183586 DOI: 10.1371/journal.pone.0109389] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 09/01/2014] [Indexed: 12/31/2022] Open
Abstract
MRI is often used in tumor localization for radiotherapy treatment planning, with gadolinium (Gd)-containing materials often introduced as a contrast agent. Motexafin gadolinium is a novel radiosensitizer currently being studied in clinical trials. The nanoparticle technologies can target tumors with high concentration of high-Z materials. This Monte Carlo study is the first detailed quantitative investigation of high-Z material Gd-induced dose enhancement in megavoltage external beam photon therapy. BEAMnrc, a radiotherapy Monte Carlo simulation package, was used to calculate dose enhancement as a function of Gd concentration. Published phase space files for the TrueBeam flattening filter free (FFF) and conventional flattened 6MV photon beams were used. High dose rate (HDR) brachytherapy with Ir-192 source was also investigated as a reference. The energy spectra difference caused a dose enhancement difference between the two beams. Since the Ir-192 photons have lower energy yet, the photoelectric effect in the presence of Gd leads to even higher dose enhancement in HDR. At depth of 1.8 cm, the percent mean dose enhancement for the FFF beam was 0.38±0.12, 1.39±0.21, 2.51±0.34, 3.59±0.26, and 4.59±0.34 for Gd concentrations of 1, 5, 10, 15, and 20 mg/mL, respectively. The corresponding values for the flattened beam were 0.09±0.14, 0.50±0.28, 1.19±0.29, 1.68±0.39, and 2.34±0.24. For Ir-192 with direct contact, the enhanced were 0.50±0.14, 2.79±0.17, 5.49±0.12, 8.19±0.14, and 10.80±0.13. Gd-containing materials used in MRI as contrast agents can also potentially serve as radiosensitizers in radiotherapy. This study demonstrates that Gd can be used to enhance radiation dose in target volumes not only in HDR brachytherapy, but also in 6 MV FFF external beam radiotherapy, but higher than the currently used clinical concentration (>5 mg/mL) would be needed.
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Porcel E, Tillement O, Lux F, Mowat P, Usami N, Kobayashi K, Furusawa Y, Le Sech C, Li S, Lacombe S. Gadolinium-based nanoparticles to improve the hadrontherapy performances. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2014; 10:1601-8. [PMID: 24846523 DOI: 10.1016/j.nano.2014.05.005] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 04/25/2014] [Accepted: 05/12/2014] [Indexed: 01/04/2023]
Abstract
UNLABELLED Nanomedicine is proposed as a novel strategy to improve the performance of radiotherapy. High-Z nanoparticles are known to enhance the effects of ionizing radiation. Recently, multimodal nanoparticles such as gadolinium-based nanoagents were proposed to amplify the effects of x-rays and g-rays and to improve MRI diagnosis. For tumors sited in sensitive tissues, childhood cases and radioresistant cancers, hadrontherapy is considered superior to x-rays and g-rays. Hadrontherapy, based on fast ion radiation, has the advantage of avoiding damage to the tissues behind the tumor; however, the damage caused in front of the tumor is its major limitation. Here, we demonstrate that multimodal gadolinium-based nanoparticles amplify cell death with fast ions used as radiation. Molecular scale experiments give insights into the mechanisms underlying the amplification of radiation effects. This proof-of-concept opens up novel perspectives for multimodal nanomedicine in hadrontherapy, ultimately reducing negative radiation effects in healthy tissues in front of the tumor. FROM THE CLINICAL EDITOR Gadolinium-chelating polysiloxane nanoparticles were previously reported to amplify the anti-tumor effects of x-rays and g-rays and to serve as MRI contrast agents. Fast ion radiation-based hadrontherapy avoids damage to the tissues behind the tumor, with a major limitation of tissue damage in front of the tumor. This study demonstrates a potential role for the above nanoagents in optimizing hadrontherapy with preventive effects in healthy tissue and amplified cell death in the tumor.
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Affiliation(s)
- Erika Porcel
- Institut des Sciences Moléculaires d'Orsay, Université Paris Sud, CNRS, Orsay, France
| | - Olivier Tillement
- Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS, Villeurbanne, France
| | - François Lux
- Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS, Villeurbanne, France
| | - Pierre Mowat
- Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS, Villeurbanne, France
| | - Noriko Usami
- Photon Factory, Institute of Material Science, High Energy Accelerator Research Organization, Oho 1, Tsukuba, Ibaraki, Japan
| | - Katsumi Kobayashi
- Photon Factory, Institute of Material Science, High Energy Accelerator Research Organization, Oho 1, Tsukuba, Ibaraki, Japan
| | - Yoshiya Furusawa
- Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan
| | - Claude Le Sech
- Institut des Sciences Moléculaires d'Orsay, Université Paris Sud, CNRS, Orsay, France
| | - Sha Li
- Institut des Sciences Moléculaires d'Orsay, Université Paris Sud, CNRS, Orsay, France
| | - Sandrine Lacombe
- Institut des Sciences Moléculaires d'Orsay, Université Paris Sud, CNRS, Orsay, France.
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Hill R, Healy B, Holloway L, Kuncic Z, Thwaites D, Baldock C. Advances in kilovoltage x-ray beam dosimetry. Phys Med Biol 2014; 59:R183-231. [DOI: 10.1088/0031-9155/59/6/r183] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Abstract
PURPOSE This Monte Carlo simulation work aims at studying a new radiotherapy approach called proton-minibeam radiation therapy (pMBRT). The main objective of this proof of concept was the evaluation of the possible gain in tissue sparing, thanks to the spatial fractionation of the dose, which could be used to deposit higher and potentially curative doses in clinical cases where tissue tolerances are a limit for conventional methods. METHODS Monte Carlo simulations (GATE v.6) have been used as a method to calculate the ratio of the peak-to-valley doses (PVDR) for arrays of proton minibeams of 0.7 mm width and several center-to-center distances, at different depths in a water phantom. The beam penumbras were also evaluated as an important parameter for tissue sparing, for example, in the treatment of non-cancer diseases like epilepsy. Two proton energies were considered in this study: a clinically relevant energy (105 MeV) and a very high energy (1 GeV), to benefit from a reduced lateral scattering. For the latter case, an interlaced geometry was also evaluated. RESULTS Higher or similar PVDR than the ones obtained in x-rays minibeam radiation therapy were achieved in several pMBRT configurations. In addition, for the two energies studied, the beam penumbras are smaller than in the case of Gamma Knife radiosurgery. CONCLUSIONS The high PVDR obtained for some configurations and the small penumbras in comparison with existing radiosurgery techniques, suggest a potential gain in healthy tissue sparing in this new technique. Biological studies are warranted to assess the effects of pMBRT on both normal and tumoral tissues.
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Affiliation(s)
- Y Prezado
- IMNC-UMR 8165, CNRS, Paris 7 and Paris 11 Universities, Orsay, France.
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20
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Xiao Q, Zheng X, Bu W, Ge W, Zhang S, Chen F, Xing H, Ren Q, Fan W, Zhao K, Hua Y, Shi J. A Core/Satellite Multifunctional Nanotheranostic for in Vivo Imaging and Tumor Eradication by Radiation/Photothermal Synergistic Therapy. J Am Chem Soc 2013; 135:13041-8. [PMID: 23924214 DOI: 10.1021/ja404985w] [Citation(s) in RCA: 396] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Qingfeng Xiao
- State Key
Laboratory of High
Performance Ceramics and Superfine Microstructures, Shanghai Institute
of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China
| | - Xiangpeng Zheng
- Department of Radiation Oncology,
Shanghai Huadong Hospital, Fudan University, Shanghai, 200040, P.R. China
| | - Wenbo Bu
- State Key
Laboratory of High
Performance Ceramics and Superfine Microstructures, Shanghai Institute
of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China
| | - Weiqiang Ge
- Department of Radiation Oncology,
Shanghai Huadong Hospital, Fudan University, Shanghai, 200040, P.R. China
| | - Shengjian Zhang
- Department of Radiology, Shanghai
Cancer Hospital, Fudan University, Shanghai,
200032, P.R. China
| | - Feng Chen
- State Key
Laboratory of High
Performance Ceramics and Superfine Microstructures, Shanghai Institute
of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China
| | - Huaiyong Xing
- State Key
Laboratory of High
Performance Ceramics and Superfine Microstructures, Shanghai Institute
of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China
| | - Qingguo Ren
- Department of Radiation Oncology,
Shanghai Huadong Hospital, Fudan University, Shanghai, 200040, P.R. China
| | - Wenpei Fan
- State Key
Laboratory of High
Performance Ceramics and Superfine Microstructures, Shanghai Institute
of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China
| | - Kuaile Zhao
- Department of Radiology, Shanghai
Cancer Hospital, Fudan University, Shanghai,
200032, P.R. China
| | - Yanqing Hua
- Department of Radiation Oncology,
Shanghai Huadong Hospital, Fudan University, Shanghai, 200040, P.R. China
| | - Jianlin Shi
- State Key
Laboratory of High
Performance Ceramics and Superfine Microstructures, Shanghai Institute
of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China
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Gokeri G, Kocar C, Tombakoglu M, Cecen Y. Monte Carlo simulation of stereotactic microbeam radiation therapy: evaluation of the usage of a linear accelerator as the x-ray source. Phys Med Biol 2013; 58:4621-42. [PMID: 23771153 DOI: 10.1088/0031-9155/58/13/4621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The usage of linear accelerator-generated x-rays for the stereotactic microbeam radiation therapy technique was evaluated in this study. Dose distributions were calculated with the Monte Carlo code MCNPX. Unidirectional single beams and beam arrays were simulated in a cylindrical water phantom to observe the effects of x-ray energies and irradiation geometry on dose distributions. Beam arrays were formed with square pencil beams. Two orthogonally interlaced beam arrays were simulated in a detailed head phantom and dose distributions were compared with ones which had been calculated for a bidirectional interlaced microbeam therapy (BIMRT) technique that uses synchrotron-generated x-rays. A parallel pattern of the beams was preserved through the phantom; however an unsegmented dose region could not be formed at the target. Five orthogonally interlaced beam array pairs (ten beam arrays) were simulated in a mathematical head phantom and the unsegmented dose region was formed. However, the dose fall-off distance is longer than the one that had been calculated for the BIMRT technique. Besides, the peak-to-dose ratios between the phantom's outer surface and the target region are lower. Therefore, the advantages of the MRT technique may not be preserved with the usage of a linac as the x-ray source.
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Affiliation(s)
- Gurdal Gokeri
- Department of Nuclear Engineering, Hacettepe University, Ankara, Turkey.
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22
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Pouyatos B, Serduc R, Chipaux M, Chabrol T, Bräuer-Krisch E, Nemoz C, Mathieu H, David O, Renaud L, Prezado Y, Laissue JA, Estève F, Charpier S, Depaulis A. Synchrotron X-ray interlaced microbeams suppress paroxysmal oscillations in neuronal networks initiating generalized epilepsy. Neurobiol Dis 2012; 51:152-60. [PMID: 23159741 DOI: 10.1016/j.nbd.2012.11.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Revised: 10/17/2012] [Accepted: 11/02/2012] [Indexed: 10/27/2022] Open
Abstract
Radiotherapy has shown some efficacy for epilepsies but the insufficient confinement of the radiation dose to the pathological target reduces its indications. Synchrotron-generated X-rays overcome this limitation and allow the delivery of focalized radiation doses to discrete brain volumes via interlaced arrays of microbeams (IntMRT). Here, we used IntMRT to target brain structures involved in seizure generation in a rat model of absence epilepsy (GAERS). We addressed the issue of whether and how synchrotron radiotherapeutic treatment suppresses epileptic activities in neuronal networks. IntMRT was used to target the somatosensory cortex (S1Cx), a region involved in seizure generation in the GAERS. The antiepileptic mechanisms were investigated by recording multisite local-field potentials and the intracellular activity of irradiated S1Cx pyramidal neurons in vivo. MRI and histopathological images displayed precise and sharp dose deposition and revealed no impairment of surrounding tissues. Local-field potentials from behaving animals demonstrated a quasi-total abolition of epileptiform activities within the target. The irradiated S1Cx was unable to initiate seizures, whereas neighboring non-irradiated cortical and thalamic regions could still produce pathological oscillations. In vivo intracellular recordings showed that irradiated pyramidal neurons were strongly hyperpolarized and displayed a decreased excitability and a reduction of spontaneous synaptic activities. These functional alterations explain the suppression of large-scale synchronization within irradiated cortical networks. Our work provides the first post-irradiation electrophysiological recordings of individual neurons. Altogether, our data are a critical step towards understanding how X-ray radiation impacts neuronal physiology and epileptogenic processes.
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Affiliation(s)
- Benoît Pouyatos
- Grenoble Institut des Neurosciences, Inserm U836, Université Joseph Fourier, Grenoble, France.
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Choi GH, Seo SJ, Kim KH, Kim HT, Park SH, Lim JH, Kim JK. Photon activated therapy (PAT) using monochromatic synchrotron X-rays and iron oxide nanoparticles in a mouse tumor model: feasibility study of PAT for the treatment of superficial malignancy. Radiat Oncol 2012; 7:184. [PMID: 23111059 PMCID: PMC3549855 DOI: 10.1186/1748-717x-7-184] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2012] [Accepted: 10/28/2012] [Indexed: 11/10/2022] Open
Abstract
Background X-rays are known to interact with metallic nanoparticles, producing photoelectric species as radiosensitizing effects, and have been exploited in vivo mainly with gold nanoparticles. The purpose of this study was to investigate the potential of sensitizing effect of iron oxide nanoparticles for photon activated therapy. Methods X-rays photon activated therapy (PAT) was studied by treating CT26 tumor cells and CT26 tumor-bearing mice loaded with 13-nm diameter FeO NP, and irradiating them at 7.1 keV near the Fe K-edge using synchrotron x-rays radiation. Survival of cells was determined by MTT assay, and tumor regression assay was performed for in vivo model experiment. The results of PAT treated groups were compared with x-rays alone control groups. Results A more significant reduction in viability and damage was observed in the FeO NP-treated irradiated cells, compared to the radiation alone group (p < 0.04). Injection of FeO NP (100 mg/kg) 30 min prior to irradiation elevated the tumor concentration of magnetite to 40 μg of Fe/g tissue, with a tumor-to-muscle ratio of 17.4. The group receiving FeO NP and radiation of 10 Gy showed 80% complete tumor regression (CTR) after 15–35 days and relapse-free survival for up to 6 months, compared to the control group, which showed growth retardation, resulting in 80% fatality. The group receiving radiation of 40 Gy showed 100% CTR in all cases irrespective of the presence of FeO NP, but CTR was achieved earlier in the PAT-treated group compared with the radiation alone group. Conclusions An iron oxide nanoparticle enhanced therapeutic effect with relatively low tissue concentration of iron and 10 Gy of monochromatic X-rays. Since 7.1 keV X-rays is attenuated very sharply in the tissue, FeO NP-PAT may have promise as a potent treatment option for superficial malignancies in the skin, like chest wall recurrence of breast cancer.
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Affiliation(s)
- Gi-Hwan Choi
- Department of Neurosurgery, School of Medicine, Catholic University of Daegu, Korea
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24
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Yan Y, Guo Z, Zhang H, Wang N, Xu Y. Precision radiotherapy for brain tumors: A 10-year bibliometric analysis. Neural Regen Res 2012; 7:1752-9. [PMID: 25624798 PMCID: PMC4302458 DOI: 10.3969/j.issn.1673-5374.2012.22.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Accepted: 08/02/2012] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE: Precision radiotherapy plays an important role in the management of brain tumors. This study aimed to identify global research trends in precision radiotherapy for brain tumors using a bibliometric analysis of the Web of Science. DATA RETRIEVAL: We performed a bibliometric analysis of data retrievals for precision radiotherapy for brain tumors containing the key words cerebral tumor, brain tumor, intensity-modulated radiotherapy, stereotactic body radiation therapy, stereotactic ablative radiotherapy, imaging-guided radiotherapy, dose-guided radiotherapy, stereotactic brachytherapy, and stereotactic radiotherapy using the Web of Science. SELECTION CRITERIA: Inclusion criteria: (a) peer-reviewed articles on precision radiotherapy for brain tumors which were published and indexed in the Web of Science; (b) type of articles: original research articles and reviews; (c) year of publication: 2002-2011. Exclusion criteria: (a) articles that required manual searching or telephone access; (b) Corrected papers or book chapters. MAIN OUTCOME MEASURES: (1) Annual publication output; (2) distribution according to country; (3) distribution according to institution; (4) top cited publications; (5) distribution according to journals; and (6) comparison of study results on precision radiotherapy for brain tumors. RESULTS: The stereotactic radiotherapy, intensity-modulated radiotherapy, and imaging-guided radiotherapy are three major methods of precision radiotherapy for brain tumors. There were 260 research articles addressing precision radiotherapy for brain tumors found within the Web of Science. The USA published the most papers on precision radiotherapy for brain tumors, followed by Germany and France. European Synchrotron Radiation Facility, German Cancer Research Center and Heidelberg University were the most prolific research institutes for publications on precision radiotherapy for brain tumors. Among the top 13 research institutes publishing in this field, seven are in the USA, three are in Germany, two are in France, and there is one institute in India. Research interests including urology and nephrology, clinical neurology, as well as rehabilitation are involved in precision radiotherapy for brain tumors studies. CONCLUSION: Precision radiotherapy for brain tumors remains a highly active area of research and development.
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Affiliation(s)
- Ying Yan
- Department of Radiotherapy, Shenyang Northern Hospital, Shenyang 110016, Liaoning Province, China
| | - Zhanwen Guo
- Department of Radiotherapy, Shenyang Northern Hospital, Shenyang 110016, Liaoning Province, China
| | - Haibo Zhang
- Department of Radiotherapy, Shenyang Northern Hospital, Shenyang 110016, Liaoning Province, China
| | - Ning Wang
- Department of Radiotherapy, Shenyang Northern Hospital, Shenyang 110016, Liaoning Province, China
| | - Ying Xu
- Department of Radiotherapy, Shenyang Northern Hospital, Shenyang 110016, Liaoning Province, China
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Anderson D, Siegbahn EA, Fallone BG, Serduc R, Warkentin B. Evaluation of dose-volume metrics for microbeam radiation therapy dose distributions in head phantoms of various sizes using Monte Carlo simulations. Phys Med Biol 2012; 57:3223-48. [PMID: 22546732 DOI: 10.1088/0031-9155/57/10/3223] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This work evaluates four dose-volume metrics applied to microbeam radiation therapy (MRT) using simulated dosimetric data as input. We seek to improve upon the most frequently used MRT metric, the peak-to-valley dose ratio (PVDR), by analyzing MRT dose distributions from a more volumetric perspective. Monte Carlo simulations were used to calculate dose distributions in three cubic head phantoms: a 2 cm mouse head, an 8 cm cat head and a 16 cm dog head. The dose distribution was calculated for a 4 × 4 mm² microbeam array in each phantom, as well as a 16 × 16 mm² array in the 8 cm cat head, and a 32 × 32 mm² array in the 16 cm dog head. Microbeam widths of 25, 50 and 75 µm and center-to-center spacings of 100, 200 and 400 µm were considered. The metrics calculated for each simulation were the conventional PVDR, the peak-to-mean valley dose ratio (PMVDR), the mean dose and the percentage volume below a threshold dose. The PVDR ranged between 3 and 230 for the 2 cm mouse phantom, and between 2 and 186 for the 16 cm dog phantom depending on geometry. The corresponding ranges for the PMVDR were much smaller, being 2-49 (mouse) and 2-46 (dog), and showed a slightly weaker dependence on phantom size and array size. The ratio of the PMVDR to the PVDR varied from 0.21 to 0.79 for the different collimation configurations, indicating a difference between the geometric dependence on outcome that would be predicted by these two metrics. For unidirectional irradiation, the mean lesion dose was 102%, 79% and 42% of the mean skin dose for the 2 cm mouse, 8 cm cat and 16 cm dog head phantoms, respectively. However, the mean lesion dose recovered to 83% of the mean skin dose in the 16 cm dog phantom in intersecting cross-firing regions. The percentage volume below a 10% dose threshold was highly dependent on geometry, with ranges for the different collimation configurations of 2-87% and 33-96% for the 2 cm mouse and 16 cm dog heads, respectively. The results of this study illustrate that different dose-volume metrics exhibit different functional dependences on MRT geometry parameters, and suggest that reliance on the PVDR as a predictor of therapeutic outcome may be insufficient.
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Affiliation(s)
- Danielle Anderson
- Department of Oncology, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2, Canada.
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Prezado Y, Martínez-Rovira I, Sánchez M. Scatter factors assessment in microbeam radiation therapy. Med Phys 2012; 39:1234-8. [DOI: 10.1118/1.3681274] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Prezado Y, Sarun S, Gil S, Deman P, Bouchet A, Le Duc G. Increase of lifespan for glioma-bearing rats by using minibeam radiation therapy. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:60-65. [PMID: 22186645 DOI: 10.1107/s0909049511047042] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 11/07/2011] [Indexed: 05/31/2023]
Abstract
This feasibility work assesses the therapeutic effectiveness of minibeam radiation therapy, a new synchrotron radiotherapy technique. In this new approach the irradiation is performed on 9L gliosarcoma-bearing rats with arrays of parallel beams of width 500-700 µm. Two irradiation configurations were compared: a lateral unidirectional irradiation and two orthogonal arrays interlacing at the target. A dose escalation study was performed. A factor of three gain in the mean survival time obtained for some animals paves the way for further exploration of the different possibilities of this technique and its further optimization.
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Affiliation(s)
- Yolanda Prezado
- ID17 Biomedical Beamline, European Synchrotron Radiation Facility, Grenoble, France.
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28
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Le Duc G, Miladi I, Alric C, Mowat P, Bräuer-Krisch E, Bouchet A, Khalil E, Billotey C, Janier M, Lux F, Epicier T, Perriat P, Roux S, Tillement O. Toward an image-guided microbeam radiation therapy using gadolinium-based nanoparticles. ACS NANO 2011; 5:9566-74. [PMID: 22040385 DOI: 10.1021/nn202797h] [Citation(s) in RCA: 161] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Ultrasmall gadolinium-based nanoparticles (GBNs) induce both a positive contrast for magnetic resonance imaging and a radiosentizing effect. The exploitation of these characteristics leads to a greater increase in lifespan of rats bearing brain tumors since the radiosensitizing effect of GBNs can be activated by X-ray microbeams when the gadolinium content is, at the same time, sufficiently high in the tumor and low in the surrounding healthy tissue. GBNs exhibit therefore an interesting potential for image-guided radiotherapy.
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Affiliation(s)
- Géraldine Le Duc
- ID17 Biomedical Beamline, European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, 38000 Grenoble, France
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Martínez-Rovira I, Sempau J, Prezado Y. Development and commissioning of a Monte Carlo photon beam model for the forthcoming clinical trials in microbeam radiation therapy. Med Phys 2011; 39:119-31. [DOI: 10.1118/1.3665768] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Prezado Y, Martínez-Rovira I, Thengumpallil S, Deman P. Dosimetry protocol for the preclinical trials in white-beam minibeam radiation therapy. Med Phys 2011; 38:5012-5020. [DOI: 10.1118/1.3608908] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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32
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Martínez-Rovira I, Prezado Y. Monte Carlo dose enhancement studies in microbeam radiation therapy. Med Phys 2011; 38:4430-9. [DOI: 10.1118/1.3603189] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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33
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Influence of Gold Nanoparticles on Radiation Dose Enhancement and Cellular Migration in Microbeam-Irradiated Cells. BIONANOSCIENCE 2011. [DOI: 10.1007/s12668-011-0001-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Ghasemi M, Kakuee O, Fathollahi V, Shahvar A, Mohati M, Ghafoori M. Physical dose distribution due to multi-sliced kV X-ray beam in labeled tissue-like media: An experimental approach. Appl Radiat Isot 2011; 69:482-91. [DOI: 10.1016/j.apradiso.2010.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2010] [Revised: 10/06/2010] [Accepted: 10/11/2010] [Indexed: 10/18/2022]
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Gokeri G, Kocar C, Tombakoglu M. Monte Carlo simulation of microbeam radiation therapy with an interlaced irradiation geometry and an Au contrast agent in a realistic head phantom. Phys Med Biol 2010; 55:7469-87. [DOI: 10.1088/0031-9155/55/24/006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Martínez-Rovira I, Sempau J, Fernández-Varea JM, Bravin A, Prezado Y. Monte Carlo dosimetry for forthcoming clinical trials in x-ray microbeam radiation therapy. Phys Med Biol 2010; 55:4375-88. [DOI: 10.1088/0031-9155/55/15/012] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Roux S, Faure AC, Mandon C, Dufort S, Rivière C, Bridot JL, Mutelet B, Marquette CA, Josserand V, Le Duc G, Le Pape A, Billotey C, Janier M, Coll JL, Perriat P, Tillement O. Multifunctional gadolinium oxide nanoparticles: towards image-guided therapy. ACTA ACUST UNITED AC 2010. [DOI: 10.2217/iim.10.5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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