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- W2020966199 abstract "A calculation engine for independent checking of the delivered dose to the prescription point has been developed and tested in an earlier work by our group. One drawback with the present system is the inability to accurately predict the absorbed dose at the depth of dose maximum, d(max), where calculations may deviate by as much as 6-7%. Accurate dose values at dmax are necessary in order to make comparisons with in vivo dose measurements. The aim of this work is to extend the present model to predict dose values at dmax to within +/-2%. Depth dose measurements at different SSD (80, 90 and 100 cm) and field sizes (5 x 5 to 40 x 40 cm2) are made at photon energies in the range from 4 to 18 MV. The effect of an acrylic block tray present in the beam is also studied. Wedged beams are handled as separate beam qualities. An entrance dose factor is defined to correct the effect of electronic disequilibrium at dmax The entrance dose factor is found to be independent of SSD and tray, but it varies with beam quality and field size. After applying the entrance dose factor, the dose at dmax can be predicted to within 1.7% (2 SD)." @default.
- W2020966199 created "2016-06-24" @default.
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- W2020966199 date "2002-10-28" @default.
- W2020966199 modified "2023-10-05" @default.
- W2020966199 title "A simplistic formalism for calculating entrance dose in high-energy x-ray beams" @default.
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- W2020966199 doi "https://doi.org/10.1088/0031-9155/47/22/306" @default.
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