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MONTE CARLO SIMULATION OF 6, 10 AND 18 MV PHOTON BEAM DOSE DISTRIBUTION IN A BRAIN TUMOR
SIMULACIÓN MONTE CARLO DE LA DISTRIBUCIÓN DE DOSIS DE HACES DE FOTONES DE 6, 10 Y 18 MV EN UN TUMOR CEREBRAL
DOI:
https://doi.org/10.15446/mo.n67.104270Keywords:
dose distribution, simulations of Monte Carlo, PENELOPE (en)distribución de dosis, simulación Monte Carlo, PENELOPE (es)
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This study aimed to obtain the absorbed dose distribution in a heterogeneous head simulator object where a brain tumor of 2 cm in diameter was located. Materials equivalent to the head and tumor were created. For head and tumor simulation, elemental composition (H, C, N, O, and others) and mass density ρ respectively were used. X-ray spectra of 6, 10 and 18 MV were used for the exposures, projecting a field of 3×3 cm2 to the tumor, with an isocentric source distance of 100 cm. Monte Carlo simulations were done with PENELOPE v.2008 code. The results show that the maximum dose to the skin is 32 %, 20 % and 14 %, the maximum dose to the skull is 88 %, 74 % and 62 %, and the maximum dose to the tumor is 62 %, 67% and 73 %, for energies of 6, 10 and 18 MV respectively. The maximum dose received by the skin and skull tissues decreases with increasing energy, while the dose in the tumor increases with increasing energy.
El objetivo de este estudio fue obtener la distribución de dosis absorbida en un objeto simulador heterogéneo de cabeza en donde se ubicó un tumor cerebral de 2 cm de diámetro. Para la simulación de la cabeza y tumor se usó la composición elemental (H, C, N, O y otros) y densidad de masa ρ respectivamente. Para las exposiciones se utilizó espectros de rayos X de 6, 10 y 18 MV, proyectando un campo de 3×3 cm2 al tumor, con una distancia fuente isocéntro de 100 cm. Las simulaciones Monte Carlo se hicieron con el código PENELOPE v.2008. Los resultados muestran que la dosis máxima en la piel es de 32 %, 20% y 14 %, la dosis m´axima en cráneo es de 88 %, 74% y 62 %, y la dosis máxima en el tumor es de 62 %, 67 % y 73 %, para las energías de 6, 10 y 18 MV respectivamente. La dosis máxima que reciben los tejidos piel y cráneo disminuyen con el aumento de la energía, mientras la dosis en el tumor aumenta con el incremento de la energía.
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