Irradiation time

AR Arne Mathias Ruder
LI Laurens Inghelram
FS Frank Schneider
GS Gustavo R. Sarria
JH Jürgen Hesser
FB Frederic Bludau
UO Udo Obertacke
FW Frederik Wenz
YA Yasser Abo-Madyan
FG Frank A. Giordano
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For the estimation of beam-on time during the treatment, all acquired conformal sum doses were virtually standardized to 13 Gy by adjusting the dwell position doses in relation to each other. Here, 13 Gy represents a single-fraction dose for interstitial brachytherapy, corresponding to an equivalent dose in 2 Gy fractions (EQD2 = n × D × ((d + α/β)/(2 + α/β))) between 32.5 and 54 Gy (for an α/β-ratio between 3 and 10), considering the increased relative biological effectiveness (RBE) of 1.3 for low-energy kV-photons [2,22,23,24].

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