1.      A patient was planned to receive 200 cGy to a field…

1.      A patient was planned to receive 200 cGy to a field measuring 12.5 cm x 16.3 cm at isocenter. If the patient measures 24 cm, calculate the size of the field on the skin surface if isocenter is located midplane and the patient is being treated on a 15 MV treatment unit.