Dosimetría radiocrómica basada en promedios no locales y el crecimiento de dos fases del polímero
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2024
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15/06/2023
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Universidad Complutense de Madrid
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Abstract
Las películas radiocrómicas debido a su alta resolución espacial, baja dependencia energética y su práctica equivalencia a tejido blando constituyen una alternativa dosimétrica de gran valor en situaciones de alto gradiente de dosis o en las que no exista equilibrio electrónico. Los sistemas dosimétricos que emplean estas películas como elemento sensible necesitan también un sistema lector, normalmente un escáner de sobremesa de calidad fotográfica, para completar su funcionamiento. Si bien estos sistemas presentan una serie de ventajas, en la práctica se ven sometidos a incertidumbres que complican su utilización y reducen su utilidad. El sistema dosimétrico se calibra mediante la curva de respuesta que relaciona la señal digital producida por el escáner con la dosis recibida por la película. Esta curva no presenta un comportamiento lineal y se han propuesto toda una variedad de modelos empíricos de carácter fenomenológico para describirla. A pesar de que se conoce tanto el tipo de absorbentes de luz que se generan debido a la radiación como la descripción cuantitativa de la respuesta espectral de estos absorbentes, hasta la fecha este conocimiento no ha sido incorporado en la formulación de los modelos...
Radiochromic films due to their high spatial resolution, low energy dependence and near biological tissue equivalence are a valuable dosimeter for measuring dose distributionsin the case of a high dose gradient or with a lack of electronic equilibrium. The dosimetry system is composed of the radiochromic film in conjuction with a flatbed scanner as well. Even though this system presents several advantages, in practice it is affected by uncertainties which make the system hard to use and lower their usefulness. The dosimetry system is calibrated by means of a dose-response curve relating thes canner digital signal with the absorbed dose in the film. This curve is not linear and several phenomenological models have been proposed to describe its behavior. In spite of being known the types of light absorbents produced by radiation in the film and the quantitative description of the spectral response of these absorbents, this knowledge has not been included in the models up to now...
Radiochromic films due to their high spatial resolution, low energy dependence and near biological tissue equivalence are a valuable dosimeter for measuring dose distributionsin the case of a high dose gradient or with a lack of electronic equilibrium. The dosimetry system is composed of the radiochromic film in conjuction with a flatbed scanner as well. Even though this system presents several advantages, in practice it is affected by uncertainties which make the system hard to use and lower their usefulness. The dosimetry system is calibrated by means of a dose-response curve relating thes canner digital signal with the absorbed dose in the film. This curve is not linear and several phenomenological models have been proposed to describe its behavior. In spite of being known the types of light absorbents produced by radiation in the film and the quantitative description of the spectral response of these absorbents, this knowledge has not been included in the models up to now...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Medicina, leída el 15-06-2023. Tesis formato europeo (compendio de artículos)