2 A patient is to be treated with 6 MV at 100 SSD to 3500 cGy in 14 fractions at a depth of 5 cm in tissue. The field size is 12 x 12 with no additional blocking. Calculate the MU setting. A patient is to be treated with 18 MV at 110 SSD to 3500 cGy in 14 fractions at a depth of 8 cm. in tissue. The field size is 15 x 15 with MLC blocking to an equivalent field size of 8 x 8. Calculate the MU setting.