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ST 3.4 –
Protección radiológica en radioterapia
INFLUENCE OF RADIOACTIVE SOURCES DISCRETIZATION IN THE
MONTE CARLO COMPUTATIONAL SIMULATIONS OF BRACHYTHERAPY
PROCEDURES: A CASE STUDY ON THE PROCEDURES FOR TREATMENT
OF PROSTATE CANCER
Santana Barbosa, Antonio Konrado
1
; Vieira, José Wilson
2
;
Lima, Fernando R. de Andrade
3
; Silva Costa, Kleber Souza
4
1
IFPE-IDE. Brasil.
2
IFPE. Brasil.
3
CRCN-CNEN. Brasil.
4
FACIPE. Brasil.
* Responsible author, email: konrado.radiologia@gmail.com
Radiotherapy computational simulation procedures using Monte Carlo (MC) methods have
shown to be increasingly important to the improvement of cancer fighting strategies. One of the
biases in this practice is the discretization of the radioactive source in brachytherapy
simulations, which often do not match with a real situation. This study had the aim to identify
and to measure the influence of radioactive sources discretization in brachytherapy MC
simulations when compared to those that do not present discretization, using prostate
brachytherapy with Iodine-125 radionuclide as model. Simulations were carried out with 108
events with both types of sources to compare them using EGSnrc code associated to MASH
phantom in orthostatic and supine positions with some anatomic adaptations. Significant
alterations were found, especially regarding bladder, rectum and the prostate itself. It can be
concluded that there is a need to discretized sources in brachytherapy simulations to ensure its
representativeness.