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Abstract

The objective of this study is to analyze the feasibility of low-cost materials, which are adapted to commercial phantoms, used in quality and control in lung cancer treatments for radiotherapy. The studied materials are acrylic, three types of wood and ethylvinylacetate, obtaining computed tomography (CT) images with a Toshiba Asteion on two phantoms. One anthropomorphic thorax CIRS®, and another homogeneous acrylic cavity-plug type of the ArcCHECK® system under reference conditions clinic. Measurements of the Hounsfield units (HU), relative electron density (DE) and physical density (DF) were made. The radiation-matter interaction was also calculated with the MonteCarlo Monaco® (TPS) calculation algorithm, and finally the experimental measurement was carried out with the System PinPoint 3D 31016 dosimetric ionization chamber and PTW UNIDOS E T10010 electrometer, irradiating with an ELEKTA® Synergy linear accelerator under the calculation conditions, in order to compare the experimental and simulated conditions. As a result, the materials are discriminated according to their relevance to be used as a thorax simulator, finding that the wood of Ochroma pyramidale presents a value of HU, DE and DF approximated to the lung tissue. So it is dosimetrically viable as compatible material for the construction of phantoms of the thoracic region.