RESUMO
This paper aims to evaluate the feasibility of applying LiF:Mg,Ti microdosimeters as a new method of dosimetry to volumetric-modulated arc therapy (VMAT) RapidArc. The response of microdosimeters presented a maximum variation of ±3.18% and ±0.510% using optically stimulated luminescence (OSL) and thermoluminescence (TL) techniques, respectively. Although studies were conducted on LiF:Mg,Ti microdosimeters previously, the microdosimeters in this study showed precision and high potential of application in VMAT dosimetry and in the verification of treatment planning using the VMAT technique.
Assuntos
Radiometria/métodos , Radioterapia de Intensidade Modulada/normas , Fluoretos , Humanos , Compostos de Lítio , Luminescência , Magnésio , Imagens de Fantasmas , Polimetil Metacrilato , Controle de Qualidade , Radiometria/instrumentação , Radiometria/estatística & dados numéricos , Dosagem Radioterapêutica , Planejamento da Radioterapia Assistida por Computador , Radioterapia de Intensidade Modulada/estatística & dados numéricos , Dosimetria Termoluminescente/instrumentação , Dosimetria Termoluminescente/métodos , Dosimetria Termoluminescente/estatística & dados numéricos , TitânioRESUMO
This paper compares the performance of CaSO4:Dy and LiF dosimeters irradiated with a 15 MV photon beam of a clinical linear accelerator to 0.1-10 Gy in a liquid water. The dose-response curves are linear up to 5 Gy. The average TL sensitivity of CaSO4:Dy is 26 and 287 times higher than the sensitivities of LiF:Mg,Ti and microLiF:Mg,Ti, respectively. CaSO4:Dy has an intrinsic efficiency 71% and 94% higher than the intrinsic efficiencies of LiF:Mg,Ti and microLiF:Mg,Ti, respectively.