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Métodos Terapéuticos y Terapias MTCI
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1.
Phys Med ; 45: 106-116, 2018 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-29472074

RESUMEN

PURPOSE: To investigate the feasibility of using the ratio of dose-area product at 20 cm and 10 cm water depths (DAPR20,10) as a beam quality specifier for radiotherapy photon beams with field diameter below 2 cm. METHODS: Dose-area product was determined as the integral of absorbed dose to water (Dw) over a surface larger than the beam size. 6 MV and 10 MV photon beams with field diameters from 0.75 cm to 2 cm were considered. Monte Carlo (MC) simulations were performed to calculate energy-dependent dosimetric parameters and to study the DAPR20,10 properties. Aspects relevant to DAPR20,10 measurement were explored using large-area plane-parallel ionization chambers with different diameters. RESULTS: DAPR20,10 was nearly independent of field size in line with the small differences among the corresponding mean beam energies. Both MC and experimental results showed a dependence of DAPR20,10 on the measurement setup and the surface over which Dw is integrated. For a given setup, DAPR20,10 values obtained using ionization chambers with different air-cavity diameters agreed with one another within 0.4%, after the application of MC correction factors accounting for effects due to the chamber size. DAPR20,10 differences among the small field sizes were within 1% and sensitivity to the beam energy resulted similar to that of established beam quality specifiers based on the point measurement of Dw. CONCLUSIONS: For a specific measurement setup and integration area, DAPR20,10 proved suitable to specify the beam quality of small photon beams for the selection of energy-dependent dosimetric parameters.


Asunto(s)
Fotones/uso terapéutico , Radiometría/métodos , Dosificación Radioterapéutica , Aire , Radioisótopos de Cobalto/uso terapéutico , Simulación por Computador , Método de Montecarlo , Aceleradores de Partículas , Incertidumbre , Agua
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