ESTRO course Dose Modelling and Verification 2017

733 / 1245

 
 
 
 
 
 
 
 
 
 
cond. a cond. d cond. c cond. b cond. a
calibration
calibration cond. d cond. c cond. b
D D M D M D M D M
D M
M D M D M D M D M
calibration value
factor d factor c factor b factor a
    
 
a b n
D
f f f D calibration M
M
      ... a b
a b
f f D
D f f
  
  
In conclusion:
III. Remember: in a factor-based formalisms, factors should cancel out!
IV. The error in factor-based models is proportional to the number of factors:
V. The number of measurements can be reduced by modelling some of the factors
(e.g non physical wedge factor)