Page 269 - 00. Complete Version - Progress Report IPEN 2014-2016

Nuclear Reactors and Fuel Cycle | Progress Report 269
Figure 22. Results from “AMIGOBrachy” software for
3D images and Dose Distribution Calculation.
ies significantly with the measurement tech-
nique used, and does not represent a realistic
speed profile, therefore, providing an inaccu-
rate dose determination. In this work, the au-
thors quantified the transit dose component
of a HDR unit based on the measurement of
the instantaneous source speed to produce
more accurate dose values. The present work
demonstrated that the transit dose correction
based on average source speed fails to accu-
rately correct the dose, indicating that the cor-
rect speed profile should be considered. The
impact on total dose due to the transit dose
correction near the dwell positions is signifi-
cant and should be considered more careful-
ly in treatments with high dose rate, several
catheters, multiple dwell positions, small dwell
times, and several fractions. Figure 1 shows
some results from “AMIGOBrachy” software.
2) Estimates of the contribution of the dose
of transit in Ir-192 brachytherapy treatments.
This study contributed to verify the velocity
profile during the movement of the radiation
source inside the patient and how this affects
the dose distribution. The outcome of these
studies contributed to an increase in the ac-
curacy of the dose estimates provided by the
planning systems currently used in radiother-
apy clinics.
3) Study of models in MESH for simulations
of problems in medical physics. These new
computational models represent an advance
in the methodology of geometric modeling
of the components that involve the compu-
tational simulation of radiation transport in
biological systems.
Both projects contributed to the CAPES award
for the best thesis of 2016.
Study of the Energy Dependence
of MOSFET Detectors for