Dose Course 2018_Flipping book
Approximations in PK dose calculations
Infinite slab approximation: doses at phantom boundaries
The depth ( z ) is generally assumed to be constant within the lateral integration plane
0
0
z
z
during calculation of the scatter dose to a point.
Primary deposition volume
Primary deposition volume
Calculation point
Calculation point
Backscatter overestimated
Ideal case
0
0
z
z
z
Calculation point 0
Primary deposition volume
Primary deposition volume
Primary deposition volume
Calculation point
Calculation point
Scatter overestimated
Scatter underestimated
Errors cancel (roughly)
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