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Ferreira CVG, Piedade JS, Prado MRD, Benavente J, Mendes BM, Paixão L, Fonseca TCF. Monte Carlo calculation of whole body counter efficiency factors for different computational phantoms. Appl Radiat Isot 2023; 194:110685. [PMID: 36758323 DOI: 10.1016/j.apradiso.2023.110685] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 12/28/2022] [Accepted: 01/15/2023] [Indexed: 02/09/2023]
Abstract
Individual monitoring can provide an estimate of the radioactivity present in the body of the exposed individuals. Periodic monitoring of occupationally exposed individuals is of great importance in case of accidental incorporation. Computational phantoms and Monte Carlo codes are often used to complement the calibration method of counting systems in internal dosimetry. Here, counting efficiency (CE) factors for a WBC system were calculated using MC simulations. The WBC system with a NaI(Tl) detector and the BOMAB phantom was modeled using three MC codes. After validation, the models were used to obtain CE values for a wide range of energies, and a CE curve was generated for the WBC system. To estimate the effects of anatomical differences on the measurement process, two anthropomorphic voxel phantoms were modeled using the VMC code. For the detector position with the highest CE value, the differences when comparing BOMAB results with the MaMP and Yale results were (-1 ± 6)% and (-1 ± 3)%, respectively. The results confirm that the use of the BOMAB phantom is a good approach for the calibration of the whole-body counter system. Measurements should be made at detector position with the highest CE values, and it is recommended to use the mean Monte Carlo CE values calculated in this work.
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Affiliation(s)
- Carlos V G Ferreira
- Universidade Federal de Minas Gerais, Escola de Engenharia - Departamento de Engenharia Nuclear, Programa de Pós-graduação em Ciências e Técnicas Nucleares, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil.
| | - Jennifer S Piedade
- Universidade Federal de Minas Gerais, Faculdade de Medicina - Departamento de Anatomia e Imagem, Av. Prof. Alfredo Balena 190, Belo Horizonte, MG, Brazil
| | - Max R D Prado
- Centro universitário de Belo Horizonte, Av. Mário Werneck 1685, Belo Horizonte MG, Brazil
| | - Jhonny Benavente
- Universidade Federal de Minas Gerais, Escola de Engenharia - Departamento de Engenharia Nuclear, Programa de Pós-graduação em Ciências e Técnicas Nucleares, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil
| | - Bruno M Mendes
- Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil
| | - Lucas Paixão
- Universidade Federal de Minas Gerais, Faculdade de Medicina - Departamento de Anatomia e Imagem, Av. Prof. Alfredo Balena 190, Belo Horizonte, MG, Brazil
| | - Telma C F Fonseca
- Universidade Federal de Minas Gerais, Escola de Engenharia - Departamento de Engenharia Nuclear, Programa de Pós-graduação em Ciências e Técnicas Nucleares, Av. Pres. Antônio Carlos 6627, Belo Horizonte MG, Brazil.
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Ferreira CV, Mendes BM, Paixão L, Lima TV, Santos-Oliveira R, Fonseca TC. Calculation of absorbed dose in paediatric phantoms using Monte Carlo techniques for 18F-FDG and 99mTc-DMSA and the new TIAC. Appl Radiat Isot 2022; 191:110526. [DOI: 10.1016/j.apradiso.2022.110526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 09/27/2022] [Accepted: 10/18/2022] [Indexed: 11/06/2022]
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Seniwal B, Thipe VC, Singh S, Fonseca TCF, Freitas de Freitas L. Recent Advances in Brachytherapy Using Radioactive Nanoparticles: An Alternative to Seed-Based Brachytherapy. Front Oncol 2021; 11:766407. [PMID: 34900715 PMCID: PMC8651618 DOI: 10.3389/fonc.2021.766407] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 10/29/2021] [Indexed: 12/24/2022] Open
Abstract
Interstitial brachytherapy (BT) is generally used for the treatment of well-confined solid tumors. One example of this is in the treatment of prostate tumors by permanent placement of radioactive seeds within the prostate gland, where low doses of radiation are delivered for several months. However, successful implementation of this technique is hampered due to several posttreatment adverse effects or symptoms and operational and logistical complications associated with it. Recently, with the advancements in nanotechnology, radioactive nanoparticles (radio-NPs) functionalized with tumor-specific biomolecules, injected intratumorally, have been reported as an alternative to seed-based BT. Successful treatment of solid tumors using radio-NPs has been reported in several preclinical studies, on both mice and canine models. In this article, we review the recent advancements in the synthesis and use of radio-NPs as a substitute to seed-based BT. Here, we discuss the limitations of current seed-based BT and advantages of radio-NPs for BT applications. Recent progress on the types of radio-NPs, their features, synthesis methods, and delivery techniques are discussed. The last part of the review focuses on the currently used dosimetry protocols and studies on the dosimetry of nanobrachytherapy applications using radio-NPs. The current challenges and future research directions on the role of radio-NPs in BT treatments are also discussed.
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Affiliation(s)
- Baljeet Seniwal
- Centre de Recherche du Centre Hospitalier Universitaire de Québec-Université Laval (CR-CHU de Québec), Axe Médecine Régénératrice, Québec, QC, Canada
| | - Velaphi C Thipe
- Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear (IPEN-CNEN), Cidade Universitária, São Paulo, Brazil.,Department of Radiology, Institute of Green Nanotechnology, School of Medicine, University of Missouri, Columbia, MO, United States
| | - Sukhvir Singh
- Institute of Nuclear Medicine and Allied Sciences, Defence Research and Development Organisation, Delhi, India
| | - Telma C F Fonseca
- Departamento de Engenharia Nuclear-Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Lucas Freitas de Freitas
- Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear (IPEN-CNEN), Cidade Universitária, São Paulo, Brazil
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Mendes BM, Guimarães Antunes PC, Soares Lopes Branco I, Nascimento ED, Seniwal B, Ferreira Fonseca TC, Yoriyaz H. Calculation of dose point kernel values for monoenergetic electrons and beta emitting radionuclides: Intercomparison of Monte Carlo codes. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2020.109327] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Monte Carlo simulation and dosimetry measurements of an experimental approach for in vitro HDR brachytherapy irradiation. Appl Radiat Isot 2021; 172:109666. [PMID: 33773203 DOI: 10.1016/j.apradiso.2021.109666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 01/09/2021] [Accepted: 02/23/2021] [Indexed: 11/20/2022]
Abstract
Irradiation of tumor cell lines is a useful way to investigate the effects of ionizing radiation on biological molecules. We designed an easy and reproducible approach for in vitro experimental high dose rate brachytherapy, which was simulated by a Monte Carlo code and dosimetrically characterized by experimental methods to evaluate the correspondence between planned doses and doses absorbed by the cells. This approach is an acrylic platform containing T25 tissue culture flasks and multiwell tissue culture plates. It allows nine parallel needles carrying an 192Ir source to irradiate the adherent cells. The whole system composed of the acrylic platform, tissue culture flasks and 192Ir source tracking was simulated by the Monte Carlo N-Particle transport code (MCNPX). Dosimetric measurements were taken by well ionization chamber and radiochromic films. There was a slight difference, averaging from 2% to 7%, between the MCNPX results and film dosimetry results regarding uniform radiation created by the source arrangement. The results showed different values for planned and measured doses in each cell culture plate, which was attributed to the non-equivalent water material used and to the lack of full scattering coming from the top of the platform. This last contribution was different for each tissue culture plate and an individual dose correction factor was calculated. The dose correction factor must be applied to match the planned dose and the actual doses absorbed by the cells. The designed approach is an efficient tool for in vitro brachytherapy experiments for most commercial cell culture plates.
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Seniwal B, Freitas LF, Mendes BM, Lugão AB, Katti KV, Fonseca TCF. In silico dosimetry of low-dose rate brachytherapy using radioactive nanoparticles. Phys Med Biol 2021; 66:045016. [PMID: 33561008 DOI: 10.1088/1361-6560/abd671] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
PURPOSE Nanoparticles (NPs) with radioactive atoms incorporated within the structure of the NP or bound to its surface, functionalized with biomolecules are reported as an alternative to low-dose-rate seed-based brachytherapy. In this study, authors report a mathematical dosimetric study on low-dose rate brachytherapy using radioactive NPs. METHOD Single-cell dosimetry was performed by calculating cellular S-values for spherical cell model using Au-198, Pd-103 and Sm-153 NPs. The cell survival and tumor volume versus time curves were calculated and compared to the experimental studies on radiotherapeutic efficiency of radioactive NPs published in the literature. Finally, the radiotherapeutic efficiency of Au-198, Pd-103 and Sm-153 NPs was tested for variable: administered radioactivity, tumor volume and tumor cell type. RESULT At the cellular level Sm-153 presented the highest S-value, followed by Pd-103 and Au-198. The calculated cell survival and tumor volume curves match very well with the published experimental results. It was found that Au-198 and Sm-153 can effectively treat highly aggressive, large tumor volumes with low radioactivity. CONCLUSION The accurate knowledge of uptake rate, washout rate of NPs, radio-sensitivity and tumor repopulation rate is important for the calculation of cell survival curves. Self-absorption of emitted radiation and dose enhancement due to AuNPs must be considered in the calculations. Selection of radionuclide for radioactive NP must consider size of tumor, repopulation rate and radiosensitivity of tumor cells. Au-198 NPs functionalized with Mangiferin are a suitable choice for treating large, radioresistant and rapidly growing tumors.
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Affiliation(s)
- Baljeet Seniwal
- Departamento de Engenharia Nuclear-Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, 31270-901, Belo Horizonte, MG, Brasil
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Seniwal B, Mendes BM, Malano F, Pérez P, Valente M, Fonseca TCF. Monte Carlo assessment of low energy electron range in liquid water and dosimetry effects. Phys Med 2020; 80:363-372. [PMID: 33285337 DOI: 10.1016/j.ejmp.2020.11.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 10/30/2020] [Accepted: 11/07/2020] [Indexed: 11/25/2022] Open
Abstract
The effects of low energy electrons in biological tissues have proved to lead to severe damages at the cellular and sub-cellular level. It is due to an increase in the relative biological effectiveness (RBE) of these electrons with a decrease in their penetration range. That is, lower the range higher will be its RBE.Therefore, accurate determination of low energy electron range becomes a key issue for radiation dosimetry. This work reports on in-water electron tracks evaluated at low kinetic energy (1-50 keV) using isotropic mono-energetic point source approach suitably implemented by different general-purpose Monte Carlo codes. For this aim, simulations were performed using PENELOPE, EGSnrc, MCNP6, FLUKA and Geant4-DNA Monte Carlo codes to obtain the particle range, R,R90,R50. Finally, evaluation of dose point kernel (DPK), as used for internal dosimetry, was carried out as an application example. Scaled dose point kernels (sDPK) were estimated for a range of mono-energetic low energy electron sources. The non-negligible differences among the calculated sDPK using different codes were obtained for energy electrons up to 5 keV. It was also observed that differences of in-water range for low-energy electrons, due to the different general-purpose Monte Carlo codes, affected the DPKs used for dosimetry by convolution approach. Finally, the 3D dosimetry was found to be almost not affected at macroscopic clinical scale, whereas non-negligible differences appeared at the microscopic level. Hence, a thorough validation of the used sDPKs have to be performed before they could be used in applications to derive any conclusions.
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Affiliation(s)
- Baljeet Seniwal
- Departamento de Engenharia Nuclear (DEN/UFMG) & Programa de Pós-graduação em Ciências e Técnicas Nucleares (PCTN), Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil
| | - Bruno M Mendes
- Centro de Desenvolvimento da Tecnologia Nuclear - CDTN/CNEN, Belo Horizonte, MG, Brasil
| | - Francisco Malano
- Departamento de Ciencias Físicas & Centro de Física e Ingeniería en Medicina (CFIM), Univesidad de La Frontera, Temuco, Chile
| | - Pedro Pérez
- Instituto de Física E. Gaviola, CONICET & Laboratorio de Investigación e Instrumentación en Física Aplicada a la Medicina e Imágenes por Rayos X (LIIFAMIR(x)), Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Medina Allende esq. Haya de la Torre, Córdoba, Argentina
| | - Mauro Valente
- Instituto de Física E. Gaviola, CONICET & Laboratorio de Investigación e Instrumentación en Física Aplicada a la Medicina e Imágenes por Rayos X (LIIFAMIR(x)), Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Medina Allende esq. Haya de la Torre, Córdoba, Argentina; Centro de Física e Ingeniería en Medicina (CFIM) & Departamento de Ciencias Físicas, Univesidad de La Frontera, Temuco, Chile
| | - Telma C F Fonseca
- Departamento de Engenharia Nuclear (DEN/UFMG) & Programa de Pós-graduação em Ciências e Técnicas Nucleares (PCTN), Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
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Seniwal B, Bhatt CP, Fonseca TCF. Comparison of dosimetric accuracy of acuros XB and analytical anisotropic algorithm against Monte Carlo technique. Biomed Phys Eng Express 2020; 6:015035. [DOI: 10.1088/2057-1976/ab6e1b] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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