Calculations

Question 1

How do you calculate Applied Dose?

Answer 1

Applied dose = Daily dose/PDD or TMR

Question 2

How do you calculate monitor units per fraction for each beam?

Answer 2

Applied dose per beam/Output factor x100

Question 3

What is the formula for working out the Equivalent Square?

Answer 3

2ab/a+b (to 1dp)

Question 4

What is interpolation?

Answer 4

A method of constructing new data points within the range of a discrete set of known data points

Question 5

How do you work out dose depth for an ant/post parallel-opposed patient?

Answer 5

Ant/post patients are treated at mid-separation so divide separation by 2

Question 6

How do you calculate Applied Dose per fraction per beam?

Answer 6

Applied dose/number of beams