Caracterización de bolus a base de plastilina usados para homogenizar la dosis en los tratamientos de teleterapia con el acelerador lineal Elekta-Synergy del Hospital Teodoro Maldonado Carbo.

Abstract

The present degree work is aimed at characterizing bolus term based on clay to homogenize the doses on surface area for teletherapy treatments in the Teodoro Maldonado Carbo Hospital. Prior to the characterization an analysis was conducted on IR spectrometry and electronic scanning microscopy in order to determine the clay chemical composition and find similar features among them. For the clay sheets characterization a thickness of 0.5, 1, 1.5 and 2 cm and a beam geometry with field size (20 x 20) cm2 were used, DFS of 100 cm and photons energy of 6 and 18 MV. During the data collection of the dosimetrics tests as the percentage of doses in depth, profiles of isodoses and absorbed doses is employed the system dosimetry IBA (ionization chambers, CCU, Blue Phamton, OmniPro Accept 7). It is concluded that clay had a similar composition with respect to the color and provides a great flexibility that allows to fit properly to uneven surfaces. In addition, through dosimetrics tests, it is demonstrated that the clay is an optimal material to be used in the elaboration of handcrafted bolus, due since when depositing a large quantity of doses, the same distribution is obtained while trying to make a commercial bolus, achieving the accurate dosage is deposited on the surface without producing any effect on the beam quality. It is recommended to carry out tomographic cuts to the clay sheets to corroborate their homogeneous distribution.