Radiobiology 2016

Further example: Standard treatment is 35 × 2 Gy to 70 Gy. Initially the schedule is given in error as 1 Gy per fraction for the first 4 fractions i.e. the first 4 Gy is given “ hyper fractionated” Compensation: 70 − 4 = 66 70 × 2 − 4 × 1 70 − 4 = 2.0606... 66/20.0606… = 32 fractions; d = 2.063 Gy