Results 11 to 20 of about 1,817 (149)

Attributable patient risk in nuclear medicine procedures and establishment of diagnostic reference levels. [PDF]

J Appl Clin Med Phys, 2023
Abstract The assessment of risk related to medical exposures as a justification tool to assist decision‐making of the medical team is not available in clinical routine. The determination of diagnostic reference levels (DRLs) for nuclear medicine (NM) procedures has been proposed as an optimization tool, but this tool has still been aimed at a standard ...
de Souza Ribeiro JC, de Mendes JDS, de Sá LV.   +2 more
europepmc   +2 more sources

Development and validation of a Monte Carlo model of a mobile accelerator for intraoperative radiation therapy. [PDF]

Med Phys
Abstract Background Intraoperative electron radiation therapy (IOERT) relies on accurate and precise dose delivery to the tumor or tumor bed using mobile accelerators and interchangeable applicators, while critical organs are typically displaced or shielded during surgery. Treatment planning and linac commissioning are often based on water measurements,
Ayala R, Soza Á, García MJ, García R, Udías JM, Ibáñez P.   +5 more
europepmc   +2 more sources

Quantification of internal dosimetry in PET patients: individualized Monte Carlo vs generic phantom‐based calculations

Medical Physics, Volume 47, Issue 9, Page 4574-4588, September 2020., 2020
Purpose The purpose of this work is to calculate individualized dose distributions in patients undergoing 18F‐FDG PET/CT studies through a methodology based on full Monte Carlo (MC) simulations and PET/CT patient images, and to compare such values with those obtained by employing nonindividualized phantom‐based methods.
Sara Neira, Jacobo Guiu‐Souto, Pablo Díaz‐Botana, Paulino Pais, Carlos Fernández, Virginia Pubul, Álvaro Ruibal, Cristian Candela‐Juan, Araceli Gago‐Arias, Miguel Pombar, Juan Pardo‐Montero   +10 more
wiley   +1 more source

The Growth of Monoraphidium sp. and Scenedesmus sp. Cells in the Presence of Thorium

The Scientific World Journal, Volume 2012, Issue 1, 2012., 2012
Toxicity of thorium by Monoraphidium sp. and Scenedesmus sp. was studied. Microalgal cultures were inoculated in ASM‐1 medium in presence and absence of thorium. Its effect was monitored by direct counting on Fuchs‐Rosenthal chamber and with software. The toxicity of thorium over the species was observed for concentrations over 50.0 mg/L. After 30 days,
Juliana Cristina de Queiroz, Ana Cristina de Melo Ferreira, Antonio Carlos Augusto da Costa, Pavel Povinec, Steven Y. Qian   +4 more
wiley   +1 more source

Ossification Vesicles with Calcium Phosphate in the Eyes of the Insect Copium teucrii (Hemiptera: Tingidae)

The Scientific World Journal, Volume 11, Issue 1, Page 186-198, 2011., 2011
Arthropod eyes are built of repeating units named ommatidia. Each single ommatidium unit contains a cluster of photoreceptor cells surrounded by support cells and pigment cells. The insect Copium eye ommatidia include additional calcium‐phosphate deposits, not described in insects to date, which can be examined today using a combined set of modern ...
Javier Garcia-Guinea, Alberto Jorge, Laura Tormo, Marta Furio, Elena Crespo-Feo, Virgilio Correcher, Pedro Prado-Herrero, Ana C. Soria, Jesus Sanz, Jose L. Nieves-Aldrey, Margaret Tzaphlidou   +10 more
wiley   +1 more source

Dosimetría penal: Arbitrariedad normativa y práctica en el Ecuador

Iustitia Socialis, 2023
El objetivo general de la investigación fue analizar jurídicamente la dosimetría penal: Arbitrariedad normativa y práctica en el Ecuador. Se utilizó el método cuantitativo el cual produce datos descriptivos, que se originan por la recolección de datos ...
Domitila Elizabeth Gutiérrez-Ataballo, Diego Francisco Granja-Zurita, Jesús Estupiñán-Ricardo   +2 more
semanticscholar   +1 more source

Comparação entre dosímetros termoluminescentes e diodos semicondutores aplicada para dosimetria in vivo de tratamentos TBI

Revista Brasileira de Física Médica, 2023
O artigo apresenta uma comparação quantitativa entre dosímetros termoluminescentes (TLD - Thermoluminescent dosimeters) e diodos semicondutores aplicada para dosimetria in vivo de tratamentos de total body irradiation (TBI).
Heres Lalli, Fábio Brüning, Anna Malthez, G. Wozniak, C. Oliveira, Emílio Ricardi, Melissa Funchal, Tatiane Fernandes   +7 more
semanticscholar   +1 more source

COMPARACIÓN DE LOS TRATAMIENTOS EN RADIOTERAPIA CONVENCIONAL Y CONFORMAL PARA CÁNCER DE PRÓSTATA POR MEDIO DE DOSIMETRÍA TERMOOLUMINISCENTE

Revista de la Academia Colombiana de Ciencias Exactas Físicas y Naturales, 2023
En el tratamiento del cáncer de próstata, la dosis prescrita por el médico oncólogo depende de la extensión de la enfermedad y de la dosis de tolerancia de los tejidos adyacentes normales.
L. Mahecha, M. Plazas, H. Machado, S. Perea   +3 more
semanticscholar   +1 more source

Estimación de la distribución espectral de haces de rayos X por cálculo iterativo computacional y diseño de programa de dosimetría, utilizando datos de atenuación

Revista de Investigación de Física, 2019
En este trabajo de investigación se ha determinado el espectro de rayos X, para ello hemos diseñado un programa computacional mediante el cálculo iterativo, se han tomado las muestras de datos de atenuación y luego se ha trabajado un programa previamente
Miguel Castillo, Galo Patiño, Marco Merma, Juan Mendoza, José Janampa, Nonoy Podestá   +5 more
doaj   +1 more source

Método de dosimetria de aceleradores lineares com medidas ponto a ponto e sistema automatizado 3D

Revista Brasileira de Física Médica, 2023
     Uma Radioterapia de qualidade requer a habilidade de determinar a dose absorvida com acurácia mínima de 95% em qualquer ponto de interesse no volume alvo no paciente.
L. Telles, Lucas Delbem, D. Souza, L. Souza, Fernanda Lucena, Nallyanne Gouveia, Iago Galvão, Marcio Araújo   +7 more
semanticscholar   +1 more source