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Pencil beam kernel parameterisation - 2
Double exponential, incl. depth parameterization, solely based on
TPR
20,10
(extracted from photon beam database)
d: depth in cm
Dose at the centre of a circular field with laterally constant energy fluence in a parallel beam:
This is the PB kernel parameterization in ESTRO MUV model
http://estro-education.org/publications/Documents/EstroBooklet10bw.pdfT Nyholm, et al (2006)
Radiother Oncol 78
, 347-51.
The pencil kernel is completely defined
through 17 parameters that can be calculated
using
TPR
20,10
(utilizing 6
×
17=102
coefficients).
This parameterization is valid and covers
TPR
20,10
from 0.6 up to 0.81 at depths down to
50 cm.
Kernel parameters can be partly interpreted physically