Consulta: creatorFacets:"Amaral,L.L."
Registros recuperados: 2
Data/hora: 10/06/2024 12:00:26

Biological X-ray irradiator characterization for use with small animals and cells
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Bruno,A. Colello; Mazaro,S.J.; Amaral,L.L.; Rego,E.M.; Oliveira,H.F.; Pavoni,J.F.
This study presents the characterization of an X-ray irradiator through dosimetric tests, which confirms the actual dose rate that small animals and cells will be exposed to during radiobiological experiments. We evaluated the linearity, consistency, repeatability, and dose distribution in the positions in which the animals or cells are placed during irradiation. In addition, we evaluated the performance of the X-ray tube (voltage and tube operating current), the radiometric survey (leakage radiation) and safety devices. The irradiator default setting was established as 160 kV and 25 mA. Tests showed that the dose rate was linear overtime (R2=1) and remained stable for long (constant) and short (repeatability) intervals between readings. The mean dose rate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: X-ray irradiator; Dosimetric characterization; Radiotherapy; Dosimetry; Radiochromic film.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000300607

Accuracy of dose planning for prostate radiotherapy in the presence of metallic implants evaluated by electron spin resonance dosimetry
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Alves,G.G.; Kinoshita,A.; Oliveira,H.F. de; Guimarães,F.S.; Amaral,L.L.; Baffa,O.
Radiotherapy is one of the main approaches to cure prostate cancer, and its success depends on the accuracy of dose planning. A complicating factor is the presence of a metallic prosthesis in the femur and pelvis, which is becoming more common in elderly populations. The goal of this work was to perform dose measurements to check the accuracy of radiotherapy treatment planning under these complicated conditions. To accomplish this, a scale phantom of an adult pelvic region was used with alanine dosimeters inserted in the prostate region. This phantom was irradiated according to the planned treatment under the following three conditions: with two metallic prostheses in the region of the femur head, with only one prosthesis, and without any prostheses. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alanine electron spin resonance dosimetry; Prostate; Electron paramagnetic resonance; Treatment-planning system; Inhomogeneity correction.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000700644