The effects of divergence and nonuniformity on the x-ray pencil-beam dose kernel
Ceberg, Crister LU
and Bjärngard, Bengt E.
(1996)
In Medical Physics
23(9).
p.1531-1535
- Abstract
- The scattered-photon part of pencil-beam dose kernels for high-energy x-ray beams can be derived experimentally by differentiating the broad-beam scatter-to-primary dose ratio as a function of radius. Formally, this requires a uniform and parallel beam, and the procedure is complicated by the nonideal, actual beam conditions: the primary dose profile is not uniform, the beam quality is not constant, and the distance to the source is not infinite. The experimentally determined scatter-to-primary ratios can be corrected for these effects before they are differentiated to give the pencil-beam kernels. The correction factors were calculated and shown to reach as much as 5% of the true scatter-to-primary ratio. The effect on the pencil beam was... (More)
- The scattered-photon part of pencil-beam dose kernels for high-energy x-ray beams can be derived experimentally by differentiating the broad-beam scatter-to-primary dose ratio as a function of radius. Formally, this requires a uniform and parallel beam, and the procedure is complicated by the nonideal, actual beam conditions: the primary dose profile is not uniform, the beam quality is not constant, and the distance to the source is not infinite. The experimentally determined scatter-to-primary ratios can be corrected for these effects before they are differentiated to give the pencil-beam kernels. The correction factors were calculated and shown to reach as much as 5% of the true scatter-to-primary ratio. The effect on the pencil beam was evaluated and corrected pencil beams were determined. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1110738
- author
- Ceberg, Crister
LU
and Bjärngard, Bengt E.
- organization
- publishing date
- 1996
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Medical Physics
- volume
- 23
- issue
- 9
- pages
- 1531 - 1535
- publisher
- American Association of Physicists in Medicine
- external identifiers
-
- pmid:8892250
- scopus:0029813609
- ISSN
- 0094-2405
- DOI
- 10.1118/1.597884
- language
- English
- LU publication?
- yes
- id
- b5346f30-bfee-4e0f-921a-2b4008c1f5b2 (old id 1110738)
- date added to LUP
- 2016-04-01 17:13:45
- date last changed
- 2022-01-29 01:17:07
@article{b5346f30-bfee-4e0f-921a-2b4008c1f5b2,
abstract = {{The scattered-photon part of pencil-beam dose kernels for high-energy x-ray beams can be derived experimentally by differentiating the broad-beam scatter-to-primary dose ratio as a function of radius. Formally, this requires a uniform and parallel beam, and the procedure is complicated by the nonideal, actual beam conditions: the primary dose profile is not uniform, the beam quality is not constant, and the distance to the source is not infinite. The experimentally determined scatter-to-primary ratios can be corrected for these effects before they are differentiated to give the pencil-beam kernels. The correction factors were calculated and shown to reach as much as 5% of the true scatter-to-primary ratio. The effect on the pencil beam was evaluated and corrected pencil beams were determined.}},
author = {{Ceberg, Crister and Bjärngard, Bengt E.}},
issn = {{0094-2405}},
language = {{eng}},
number = {{9}},
pages = {{1531--1535}},
publisher = {{American Association of Physicists in Medicine}},
series = {{Medical Physics}},
title = {{The effects of divergence and nonuniformity on the x-ray pencil-beam dose kernel}},
url = {{http://dx.doi.org/10.1118/1.597884}},
doi = {{10.1118/1.597884}},
volume = {{23}},
year = {{1996}},
}