Advanced

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:
author
organization
publishing date
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
2008-07-22 09:43:57
date last changed
2017-01-01 07:27:50
@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},
  volume       = {23},
  year         = {1996},
}