Dose Course 2018_Flipping book

5

How to express deviations?

Calculated and measured dose distributions can be compared according to

Local

1) to the local dose value

(

) / D

d %( i , B ) = 100 × D

( i , B ) - D

( i , B )

( i , B )

calc

meas

meas

2) to the dose at a specific point inside the beam under consideration

Global

(

)

d

Bi

D

( DBi meas

( DB ref meas

B ref

,%(

=

100 )



) ,( −

,

/)

) ,

calc

this is proposed in the IAEA TRS-1583 3) to the dose in a reference field

Global and output normalised

(

)

Bi d =

100 ) ,%( D 

Bi

) ,( D −

DR ref

R ref

(

( /) , meas

) ,

calc

meas

B – present beam, R – Ref beam

Dublin 2018