CPB Ljubljana 2018 course book

Biologically equivalent dosis of 30 Gy / 10 fractions Reference: 2 Gy / fraction

• EQD2 = 30 ( / + 3) / ( / + 2)

• Tumour (Squamous cell ca – early responding normal tissues):

/ = 10 Gy EQD2 = 30 x 13 / 12 = 32.5 Gy

• Late responding normal tissues:

/ = 3 Gy EQD2 = 30 x 6 / 5 = 36 Gy