ATP 2016
Calculation object approximations Pencil beam kernel
• ρ 0
• z
The depth ( z ) is generally assumed to be constant within the lateral integration plane during calculation of the scatter dose to a point.
Primary deposition volume
Calculation point
• ρ 0
• ρ 0
• z
• z
• z
Calculation point • ρ 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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