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1. The entire mini-phantom/build-up cap should always be enclosed
by the radiation field (incl. margin for penumbra).
2. The mp/bc should provide lateral CPE;
Factor-based dose calculations: basic dosimetric quantities
S
c
: mini-phantom/buildup cap design – lateral considerations
r
CPE
≈
5.973·
TPR
20,10
- 2.688 [g/cm
2
]
Experimental investigations suggest that a wall thickness
≥
1
g/cm
2
is sufficient.
r
CPE
≈
1.85 g/cm
2
r
CPE
≈
2.06 g/cm
2
Divergence!
Jursinic PA (2006) , Med Phys 33, 1720-8,
Li et al MedPhys
22
, 1995, 1167-1170