Authors:Mahdi Sadeghi, Omid Kiavar, S. Hosseini, Rozhin Fatehi, and Claudio Tenreiro
The Nitinol stent was bombarded in a cyclotron at a flux rate of 4 μA/cm2 to produce 48V via 48Ti (p, n) 48V reaction. In this study dose distribution of 48V radioactive stent was investigated for renal arteries. Version X-2.6 of the MCNP Monte Carlo radiation transport system
code was employed to calculate dose distribution around the stent. As 48V is a mixed gamma and beta particle emitter, two separate runs of MCNP for both beta and gamma particles were performed and
the total deposited dose was acquired by adding the two mentioned values. In order to verify the simulation, the calculated
results have been compared with previous published data for the source. Calculated results show high dose gradient near the
stent and the maximum amount of dose deposits at the vessel wall. According to (AAPM) TG-60/149 protocol, the dosimetric parameters,
including geometry function, G(ρ,z), radial dose function, gL(ρ), and anisotropy function, F(ρ,z), were also determined.