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[en] Pencil beam kernel (PBK) for a given depth was calculated based on field profiles (penumbras) in the following 5 steps: (1) The scatter kernel was calculated based on the phantom scatter factors measured at a reference depth assuming identity of the Pi and Pe profiles; (2) The intensity profile Pi was calculated by solving the convolution equation; (3) The Ks(r,z) value was recalculated by using this new Pi; (4) The boundary kernel was calculated from the observed field edge profiles; (5) The resultant kernel K was calculated as a combination of Ks(r,z) and Kb(r,z). For the dose distribution calculation, the transverse PBK profile at the given depth was fitted with 3 Gaussian curves in the Matlab code. The dose calculation by using the PBK convolution integral could then be reduced to the analytical solution of an equation. A good agreement with values observed in a water phantom was obtained.(P.A.)
Source
Stepan, Vaclav (ed.); Czech Radiation Protection Society, Prague (Czech Republic); National Radiation Protection Institute, Prague (Czech Republic); Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, Prague (Czech Republic); 122 p; ISBN 978-80-01-04430-8; 
; Nov 2009; p. 47; 31. radiation protection days; XXXI. Dny radiacni ochrany; Kouty nad Desnou (Czech Republic); 2-6 Nov 2009; Presented within the session Radiation protection in radiodiagnosis, radiotherapy and nuclear medicine
; Nov 2009; p. 47; 31. radiation protection days; XXXI. Dny radiacni ochrany; Kouty nad Desnou (Czech Republic); 2-6 Nov 2009; Presented within the session Radiation protection in radiodiagnosis, radiotherapy and nuclear medicine