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r

CPE

1.85 g/cm

2

r

CPE

2.06 g/cm

2

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;

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.

Divergence!

Jursinic PA (2006) , Med Phys 33, 1720-8,

Li et al MedPhys

22

, 1995, 1167-1170

Factor-based dose calculations: basic dosimetric quantities

S

c

: mini-phantom/buildup cap design – lateral considerations