Dosimetric and bremsstrahlung performance of a single convergent beam for teletherapy device |
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| Affiliation: | 1. Departamento de Ciencias Físicas, Universidad de La Frontera, Temuco, Chile;2. Centro de Física e Ingeniería en Medicina – CFIM, Universidad de La Frontera, Temuco, Chile;3. Instituto de Física E. Gaviola, CONICET & Universidad Nacional de Córdoba, Argentina;1. Laboratoire de Physique Appliquée et Théorique, L. P. A.T, Université Laarbi Tebessi, Tébessa, Algérie;2. Département de Physique, Faculté des sciences, Université de Badji Mokhtar, Annaba, Algérie;1. Instituto de Física Enrique Gaviola (IFEG), CONICET, Córdoba, Argentina;2. Laboratorio de Investigación e Instrumentación en Física Aplicada a la Medicina e Imágenes por Rayos X (LIIFAMIRx), FAMAF-UNC, Córdoba, Argentina;3. Departamento de Matemática, CRUB-UNCo, Río Negro, Argentina;4. Centro Atómico Ezeiza (CAE), Comisión Nacional de Energía Atómica (CNEA), Buenos Aires, Argentina;5. Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Química Orgánica, Córdoba, Argentina;6. Instituto de Investigación y Desarrollo en Ingeniería de Procesos y Química Aplicada (IPQA), CONICET, Córdoba, Argentina;7. Centro de Física e Ingeniería en Medicina - CFIM & Departamento de Ciencias Físicas, Universidad de La Frontera, Temuco, Chile;1. Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, Athens 115 27, Greece;2. Greek Atomic Energy Commission (IRCL/GAEC-EIM), P.O. Box 60092, Agia Paraskevi, 15310 Attiki, Greece;1. Department of Life and Physical Sciences, Fisk University, Nashville, TN 37208, USA;2. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA;3. INFN—Laboratori Nazionali del Gran Sasso, I-67100 Assergi, Italy;4. Gran Sasso Science Institute, I-67100 L’Aquila, Italy;1. Instrumental Analysis Laboratory, Department of Chemistry, Dongguk University, Seoul 100-715, Republic of Korea;2. Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600, Republic of Korea |
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| Abstract: | The present work investigates preliminary feasibility and characteristics of a new type of radiation therapy modality based on a single convergent beam of photons. The proposal consists of the design of a device capable of generating convergent X-ray beams useful for radiotherapy. The main goal is to achieve high concentrated dose delivery. The first step is an analytical approach in order to characterize the dosimetric performance of the hypothetical convergent photon beam. Then, the validated FLUKA Monte Carlo main code is used to perform complete radiation transport to account also for scattering effects. The proposed method for producing convergent X-rays is mainly based on the bremsstrahlung effect. Hence the operating principle of the proposed device is described in terms of bremsstrahlung production. The work is mainly devoted characterizing the effect on the bremsstrahlung yield due to accessories present in the device, like anode material and geometry, filtration and collimation systems among others.The results obtained for in-depth dose distributions, by means of analytical and stochastic approaches, confirm the presence of a high dose concentration around the irradiated target, as expected. Moreover, it is shown how this spot of high dose concentration depends upon the relevant physical properties of the produced convergent photon beam.In summary, the proposed design for producing single convergent X-rays attained satisfactory performance for achieving high dose concentration around small targets depending on beam spot size that may be used for some applications in radiotherapy, like radiosurgery. |
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| Keywords: | Convergent beam radiotherapy (CBRT) Monte Carlo simulations Dosimetry |
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