Zobrazeno 1 - 10
of 11
pro vyhledávání: '"P. C. D. Petchevist"'
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 394:89-96
Accurate determination of absorbed dose is of great importance in every medical application of ionizing radiation, mainly when involving biological tissues. Among different types of dosimeters, the ferrous sulfate chemical solution, known as Fricke s
Matched Fields Technique for $^{90}{\rm Sr}/^{90}{\rm Y}$ Low-Dose Rate Source for Keloid Treatments
Publikováno v:
IEEE Transactions on Nuclear Science. 60:837-842
90Sr/90Y low-dose rate sources are commonly used in pterygium, keloid, and skin postsurgery treatments to avoid reincidence. The beta radioactive materials are deposited on metal plates, in geometries, such as square, rectangular, and circular, to tr
Autor:
P. C. D. Petchevist, F. G. A. Sampaio, Adelaide de Almeida, Andre Luiz Vettore de Oliveira, Michely C. da Silveira
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 269:3137-3140
Radiotherapy uses ionizing radiation to destroy tumor cells. The absorbed dose control in the target volume is realized through radiation sensors, such as Fricke dosimeters and radiochromic film, which permit to realize bi-dimensional evaluations at
Autor:
Marcos V. Moreira, Adelaide de Almeida, F. G. A. Sampaio, Lucas S. del Lama, P. C. D. Petchevist
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 269:3141-3144
Nowadays, electron beams from high-energy linear accelerators (LINAC) are widely used in a variety of radiotherapy treatments being suitable especially for superficial tumors. Since this sort of ionizing radiation has stopping power higher than photo
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 280:259-264
Dosimetric gel is used in several measurements due to its linearity, low cost, and possibility for 3D measurements. This work brings a new possibility to apply the Fricke Xylenol Gel recipe in the diagnostic measurements region. The Fricke Xilenol Ge
Autor:
Lucas Nonato de Oliveira, Adelaide de Almeida, Marco V. Moreira, P. C. D. Petchevist, Mirko Alva-Sánchez
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
Beta therapy is employed in post surgery to treat lesions such as pterygia, keloid and glioblastoma. The beta source most used for these purposes is 90 / 90 Y, whose quality assurance is a challenge, because the detectors currently used for this eval
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e438f1446624844f93da21799dd5d89e
Autor:
Dimas Tadeu Covas, Lucas S. del Lama, Evamberto Garcia de Góes, Edson Lara Moretto, P. C. D. Petchevist, Adelaide de Almeida, José Carlos Borges
Publikováno v:
PLoS ONE, Vol 8, Iss 6, p e65334 (2013)
PLoS ONE
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
PLoS ONE
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Irradiation of whole blood and blood components before transfusion is currently the only accepted method to prevent Transfusion-Associated Graft-Versus-Host-Disease (TA-GVHD). However, choosing the appropriate technique to determine the dosimetric pa
Autor:
M. V. Moreira, P. C. D. Petchevist, C.E. de Almeida, A. de Almeida, F. G. A. Sampaio, L. N. de Oliveira
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
When small field sizes are recommended in radiotherapy, the dosimeter must have an adequate spatial resolution in order to determine the absorbed dose at the region of interest. The study of electron small field size is important since its dosimetry
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16f73dd40a1962e8f50bcb2a521c9e1d
Publikováno v:
AIP Conference Proceedings.
According to the IAEA TRS-398 protocol, a parallel plate ionization chamber is recommended to be used in electron dosimetry. The important dosimetric parameters such as R{sub 100} and R{sub 50}, inferred from the percentage depth dose (PDD) curve, al
Publikováno v:
AIP Conference Proceedings.
A thermoplastic mask is used to immobilize the patient head during radiotherapy. It also enhances the absorbed dose distribution improving the radiotherapic treatment. In this work we investigate the influence of the thermoplastic material in the pha