2Harran Üniversitesi, Fen-Edebiyat Fakültesi, Fizik Bölümü, Şanlıurfa
3İstanbul Üniversitesi, Onkoloji Enstitüsü, İstanbul OBJECTIVES
This study aimed to verify dose distributions for 192Ir wires obtained from both the CMS XiO treatment planning system (TPS) and the Monte Carlo (MC) method.
METHODS
Using 192Ir source of 1.84 mCi/cm activity, three different
wire setups were investigated. Whole properties of the wires
were modelled in the MC code MCNP. Dose distributions and
isodose curves were obtained and then compared with TPS
results.
RESULTS
Isodose curves from TPS and MC were found to differ as 0.28
mm, 0.4 mm and 0.57 mm for one, two and three wire applications,
respectively. MC was observed to yield much narrower
isodose curves.
CONCLUSION
The greater the number of wires, the larger the differences between
the isodose widths calculated with TPS and MC. However,
these differences are less than 1 mm. The results show
that, for low dose rate (LDR) brachytherapy applications,
CMS XiO TPS and MC yield consistent isodose curves.