Gynae BT 2017
Intro
Mission
Concept
Solution
Practice
Mathematical Description /Normalization - EQD2
➢ BED is the virtual dose value that produces the same biological effect as the physical dose with an infinite low dose rate
➢ Calculated BED values are normalized to conventional EBRT with 2 Gy / fraction (reference schedule) :
BED = D [ 1 + g d / ( / ) ] = D 2Gy
[ 1 + 2 / ( / ) ]
g
➢ To calculate the total isoeffective dose D 2Gy
of a combined treatment, all
isoeffective doses D
are added up :
2Gy
D
= D
+ D
2Gy, TOTAL
2Gy, EXTERNAL
2Gy, BRACHY
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