Análisis dosimétrico de los algoritmos de cálculo Pencil Beam y Electron Monte Carlo con haces de electrones en tratamiento de cabeza
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Peréz Díaz, Mara Edith
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En este trabajo, se analizaron los parámetros dosimétricos de los algoritmos de cálculo Pencil Beam (PBC) y Electrón Monte Carlo (eMC) para haces de electrones en tres condiciones de inhomogeniedades y heterogeneidades presentes en los tratamientos de cabeza. Primero se hicieron medidas para el comisionamiento de los algoritmos de cálculo y el sistema de planeación de tratamiento (TPS). Para el algoritmo eMC, se realizaron tres pruebas de cálculo: en un medio homogéneo, en condición de haz inclinado y en un medio inhomogéneo. Por último, se realizó la planeación en simuladores físicos de tres tratamientos con presencia de inhomogeneidades y heterogeneidades, donde se compararon parámetros dosimétricos como: unidades monitor(UM), profundidades y volúmenes de las curvas de isodosis de 100 %, 90 %, 50 % y 20 %. Obteniendo como resultado que las heterogeneidades muy pronunciadas producen errores de calculo al usar el algoritmo PBC, pero no al usar el algoritmo eMC.
Abstract: In this work, dosimetric parameters of the calculation algorithms Pencil Beam (PBC) and Electron Monte Carlo (eMC) for electron beams in three conditions of inhomogeneities and heterogeneities in head treatments were analyzed. For this analysis, measurements were first made for the commissioning of the calculation algorithms, as well as in the treatment planning system (TPS), for the eMC algorithm. three tests were performed to calculate the algorithms in a homogeneous medium, inhomogeneous and in an angled beam condition. Finally, planning of three treatments with physical simulators were done in presence of inhomogeneities and heterogeneities. Parameters such as: monitor units, depths and volumes of the isodose curves of 100 %, 90 %, 50 % and 20 % were compared. Obtaining as result that for very pronounced heterogeneities are seen calculation errors in PBC algorithm, but not with eMC algorithm.
Abstract: In this work, dosimetric parameters of the calculation algorithms Pencil Beam (PBC) and Electron Monte Carlo (eMC) for electron beams in three conditions of inhomogeneities and heterogeneities in head treatments were analyzed. For this analysis, measurements were first made for the commissioning of the calculation algorithms, as well as in the treatment planning system (TPS), for the eMC algorithm. three tests were performed to calculate the algorithms in a homogeneous medium, inhomogeneous and in an angled beam condition. Finally, planning of three treatments with physical simulators were done in presence of inhomogeneities and heterogeneities. Parameters such as: monitor units, depths and volumes of the isodose curves of 100 %, 90 %, 50 % and 20 % were compared. Obtaining as result that for very pronounced heterogeneities are seen calculation errors in PBC algorithm, but not with eMC algorithm.