Experimental determination of the dose kernel in high-energy x-ray beams
Ceberg, Crister LU
; Bjärngard, Bengt E.
and Zhu, Timothy C.
(1996)
In Medical Physics
23(4).
p.505-511
- Abstract
- A semiempirical method to characterize the pencil-beam dose kernel is presented. Results from measurements are described by mathematical models of the applicable physical processes. The measurements were made with 6 and 25 MV x-ray beams from a linear accelerator. Broad-beam notations were used consistently, and the pencil-beam quantities were obtained by differentiation. The results were compared to pencil-beam kernels calculated by Monte Carlo techniques. The analysis of the measured data included a number of approximations. It was assumed that all the constituent pencil beams in the field are parallel, i.e., the divergence is ignored. Furthermore, the lateral variations of the incident photon fluence and the energy spectrum were... (More)
- A semiempirical method to characterize the pencil-beam dose kernel is presented. Results from measurements are described by mathematical models of the applicable physical processes. The measurements were made with 6 and 25 MV x-ray beams from a linear accelerator. Broad-beam notations were used consistently, and the pencil-beam quantities were obtained by differentiation. The results were compared to pencil-beam kernels calculated by Monte Carlo techniques. The analysis of the measured data included a number of approximations. It was assumed that all the constituent pencil beams in the field are parallel, i.e., the divergence is ignored. Furthermore, the lateral variations of the incident photon fluence and the energy spectrum were disregarded. Monte Carlo calculations, on the other hand, are based on an average energy spectrum over the field, and are free from divergence and variations in the incident photon fluence. Measured and Monte Carlo calculated pencil beams nevertheless agreed well, and the approximations mentioned caused at maximum 2.7% discrepancies for the largest field size at 6 MV. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1110743
- author
- Ceberg, Crister
LU
; Bjärngard, Bengt E.
and Zhu, Timothy C.
- publishing date
- 1996
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Medical Physics
- volume
- 23
- issue
- 4
- pages
- 505 - 511
- publisher
- American Association of Physicists in Medicine
- external identifiers
-
- pmid:9157261
- scopus:0029877777
- ISSN
- 0094-2405
- DOI
- 10.1118/1.597807
- language
- English
- LU publication?
- no
- id
- 8f9785bf-0133-46b1-ade4-9649269d115e (old id 1110743)
- date added to LUP
- 2016-04-01 16:28:28
- date last changed
- 2022-03-15 00:45:20
@article{8f9785bf-0133-46b1-ade4-9649269d115e,
abstract = {{A semiempirical method to characterize the pencil-beam dose kernel is presented. Results from measurements are described by mathematical models of the applicable physical processes. The measurements were made with 6 and 25 MV x-ray beams from a linear accelerator. Broad-beam notations were used consistently, and the pencil-beam quantities were obtained by differentiation. The results were compared to pencil-beam kernels calculated by Monte Carlo techniques. The analysis of the measured data included a number of approximations. It was assumed that all the constituent pencil beams in the field are parallel, i.e., the divergence is ignored. Furthermore, the lateral variations of the incident photon fluence and the energy spectrum were disregarded. Monte Carlo calculations, on the other hand, are based on an average energy spectrum over the field, and are free from divergence and variations in the incident photon fluence. Measured and Monte Carlo calculated pencil beams nevertheless agreed well, and the approximations mentioned caused at maximum 2.7% discrepancies for the largest field size at 6 MV.}},
author = {{Ceberg, Crister and Bjärngard, Bengt E. and Zhu, Timothy C.}},
issn = {{0094-2405}},
language = {{eng}},
number = {{4}},
pages = {{505--511}},
publisher = {{American Association of Physicists in Medicine}},
series = {{Medical Physics}},
title = {{Experimental determination of the dose kernel in high-energy x-ray beams}},
url = {{http://dx.doi.org/10.1118/1.597807}},
doi = {{10.1118/1.597807}},
volume = {{23}},
year = {{1996}},
}