Diapositive 1

Correct for arm

back scatter

(if needed)

Pixel to dose at

10 cm depth in

a cylindrical

phantom

calibration

Convolution with

a kernel to

account for

phantom scatter

and electron

transport

How is this Kernel constructed:

1. The relative dose as a funtion of field size matches the TPS

calculation at the phantom center

2. Penumbraal edge of a typical field is broadened to the same

extend it would be at the depth of the phantom center

Off axis correction

W. Ansbacher, Med Phys (33;9), 2006

B. W. King et al. JAMP (17;6), 2016