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- W2141681909 abstract "Antecedentes: se presentan las primeras fases de pruebas in vitro que refutan la hipotesis de que el material de 2-3 mm de plomo utilizado como protector en protesis radiferas, durante radioterapia en pacientes oncologicos de cabeza y cuello, ayuda a reducir el deposito de dosis en los organos sanos o de riesgo. Proposito: comprobar la efectividad del plomo para reducir la radiacion terapeutica. Metodos: se realizaron pruebas in vitro con dos placas de plomo de 1 mm × 5 cm × 5 cm sobre una pelicula radiocromica Gafchromic RQTA2 “10 × 10”. Se aplico, con acelerador lineal, una energia de 6 MeV en dosis promedio de 192 cGy de una fraccion de dosis aplicables en teleterapia. Tambien se efectuaron pruebas de contacto de 0,168 MeV de iridio 192 (braquiterapia) para una dosis de 300 cGy, la cual se aplica fraccionada bajo una cubierta de agua solida (polimero de 2 cm de espesor con la misma densidad del agua). Se realizaron pruebas similares sin la proteccion de plomo en ambos casos (campo abierto) como control. Resultados: con la lectura de densidades de la pelicula se encontro que en el tratamiento con iridio192 y 2 mm de plomo hubo una diferencia de aumento de radiacion del 7,25 % con respecto al campo abierto (sin plomo). En el tratamiento con acelerador lineal a 6 MeV con 2 mm de plomo se observo un aumento de 16,25 % con respecto al campo abierto. Background: we present early-stage in vitro evidence supporting the hypothesis that 2-3 mm lead plaques used as shielding in prosthesis for the radiotherapy in head-and-neck cancer patients help reduce deposit dose in healthy or at risk organs. Purpose: to test the effect of lead in reducing therapeutic radiation. Methods: in vitro tests were performed with two 1 mm × 5 cm × 5 cm lead plates on a Gafchromic RQTA2 “10 × 10” chromic film. 6 MeV energy doses of 192 cGy applied with a linear accelerator as a fraction of applicable doses of teletherapy to test contact. Likewise, 168 MeV Iridium 192 (brachytherapy) were used for a 300 cGy dosis under a cover of solid water (2 cm thick polymer with the same density as water). Similar tests were performed without the lead protection in both cases (open field) as a control. Results: the density readings of the films showed, for the treatment with 2 mm lead Iridium 192, an increased difference of radiation of 7.25% compared to the open field. The treatment with linear accelerator with 6 MeV energy and 2 mm lead increased 16.25% compared to the open field." @default.
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- W2141681909 date "2015-11-04" @default.
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- W2141681909 title "Efectividad de las prótesis intrabucales protectoras emplomadas en teleterapia y braquiterapia / Effectiveness of Intr aoral Pr otective Leaded Pr ostheses in Teletherapy and Brachytherapy" @default.
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- W2141681909 doi "https://doi.org/10.11144/javeriana.uo33-71.epip" @default.
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