Radiobiology 2016

Another example: Standard treatment is 35 × 2 Gy to 70 Gy. Initially the schedule is given in error as 4 Gy per fraction for the first 3 fractions i.e. the first 12 Gy is given “hypofractionated” Compensation: 70 − 12 = 58 70 × 2 − 12 × 4 70 − 12 = 1.5862... 58/1.5862… = 37 fractions; d = 1.568 Gy