UM NOVO MODELO COMPUTACIONAL DE EXPOSIÇÃO PARA SIMULAR A RADIOEMBOLIZAÇÃO USANDO O ÍTRIO 90
DOI:
https://doi.org/10.5540/tcam.2025.026.e01790Keywords:
modelos computacionais de exposição, emissores beta, Monte Carlo, EGSnrc, radioembolização.Abstract
To evaluate the energy deposited in radiosensitive organs and tissues of the human body, it is necessary to develop exposure computational models (ECMs). The source in ECMs corresponds to an algorithm intended to produce the initial state of the simulation. Using Monte Carlo (MC) techniques implemented in robust codes available in the scientific community, the histories of particles are simulated, from interaction to interaction, until their energies are below a cutoff threshold, or they leave the phantom. This work presents a new ECM called MSUPREE, where the implemented source generates electron samples originating from the decay of the radionuclide yttrium 90 (Y-90), used in radioembolization, a treatment for liver tumors. The initial state of an electron is defined mainly by its starting position, direction of movement and initial energy. In MSUPREE, the initial positions are drawn on a sphere inside the liver with center and radius defined in the ECM input files. From this, the electrons move in space with polar and azimuthal angles uniformly drawn in their domains with initial energy drawn from the Y-90 spectrum table contained in a specific input file for MSUPREE. The execution of MSUPREE produced dosimetric data that allow us to conclude not only that the phantom + source + MC code coupling is correct, but also that the authors, and researchers on the subject, have a new ECM for internal dosimetry that can be improved for other spatial and energetic distributions of beta emitters.
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