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- W2395681008 abstract "Introduction In photon brachytherapy (BT), experimental dosimetry is needed to verify treatment plans if planning algorithms neglect varying attenuation, absorption or scattering conditions. The detector’s response is energy dependent, including the detector material to water dose ratio and the intrinsic mechanisms. The local mean photon energy E ¯ ( r ) must be known or another equivalent energy quality parameter used. We propose the brachytherapy photon radiation quality index Q BT ( E ¯ ) , to characterize the photon radiation quality in view of measurements of distributions of the absorbed dose to water, D w , around BT sources. Materials and methods While the external photon beam radiotherapy (EBRT) radiation quality index Q EBRT ( E ¯ ) = TPR 10 20 ( E ¯ ) is not applicable to BT, the authors have applied a novel energy dependent parameter, called brachytherapy photon radiation quality index, defined as Q BT ( E ¯ ) = D prim ( r = 2 cm, θ 0 = 90 ° ) / D prim ( r 0 = 1 cm, θ 0 = 90 ° ) , utilizing precise primary absorbed dose data, Dprim, from source reference databases, without additional MC-calculations. Results and discussion For BT photon sources used clinically, Q BT ( E ¯ ) enables to determine the effective mean linear attenuation coefficient μ ¯ ( E ) and thus the effective energy of the primary photons E prim eff ( r 0 , θ 0 ) at the TG-43 reference position P ref ( r 0 = 1 cm, θ 0 = 90 ° ) , being close to the mean total photon energy E ¯ tot ( r 0 , θ 0 ) . If one has calibrated detectors, published E ¯ tot ( r ) and the BT radiation quality correction factor k Q , Q 0 BT ( E ¯ , r , θ ) for different BT radiation qualities Q and Q 0 , the detector’s response can be determined and D w ( r , θ ) measured in the vicinity of BT photon sources. Conclusions This novel brachytherapy photon radiation quality index Q BT characterizes sufficiently accurate and precise the primary photon‘s penetration probability and scattering potential." @default.
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- W2395681008 date "2016-06-01" @default.
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- W2395681008 title "A brachytherapy photon radiation quality index Q BT for probe-type dosimetry" @default.
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- W2395681008 doi "https://doi.org/10.1016/j.ejmp.2016.03.008" @default.
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