440 / 1173
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