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A method for conversion of hounsfield number to electron density and prediction of macroscopic pair production cross-sections

Knöös, Tommy LU ; Nilsson, Mats LU and Ahlgren, Lars (1986) In Radiotherapy and Oncology 5(4). p.337-345
Abstract
A method for the determination of electron density using a narrow beam attenuation geometry is described. The method does not require that the elemental composition of the phantom materials is known. The Hounsfield numbers for the phantom materials used were determined using five different CT scanners. A relationship between Hounsfield number and electron density can thus be established, which is of considerable value in radiation therapy treatment planning procedures. Measurements of the ratio coherent/incoherent scattering of low energy photons in a certain geometry has proven valuable for determination of atomic number, which in its turn can be used for estimation of macroscopic pair production coefficients for high energy photons. The... (More)
A method for the determination of electron density using a narrow beam attenuation geometry is described. The method does not require that the elemental composition of the phantom materials is known. The Hounsfield numbers for the phantom materials used were determined using five different CT scanners. A relationship between Hounsfield number and electron density can thus be established, which is of considerable value in radiation therapy treatment planning procedures. Measurements of the ratio coherent/incoherent scattering of low energy photons in a certain geometry has proven valuable for determination of atomic number, which in its turn can be used for estimation of macroscopic pair production coefficients for high energy photons. The combination of knowledge of electron density with methods for determination of processes, dependent on atomic number, can form a base for adequate composition of phantom materials for purposes of testing dose calculation algorithms for photons and electrons. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electron density, Hounsfield number, Dose planning, Radiation therapy
in
Radiotherapy and Oncology
volume
5
issue
4
pages
337 - 345
publisher
Elsevier
external identifiers
  • scopus:0022545872
ISSN
1879-0887
DOI
10.1016/S0167-8140(86)80183-9
language
English
LU publication?
yes
id
7b8a119a-b167-4e84-b24b-47a639daa5cd (old id 1103722)
date added to LUP
2008-08-11 11:30:00
date last changed
2017-08-13 03:30:46
@article{7b8a119a-b167-4e84-b24b-47a639daa5cd,
  abstract     = {A method for the determination of electron density using a narrow beam attenuation geometry is described. The method does not require that the elemental composition of the phantom materials is known. The Hounsfield numbers for the phantom materials used were determined using five different CT scanners. A relationship between Hounsfield number and electron density can thus be established, which is of considerable value in radiation therapy treatment planning procedures. Measurements of the ratio coherent/incoherent scattering of low energy photons in a certain geometry has proven valuable for determination of atomic number, which in its turn can be used for estimation of macroscopic pair production coefficients for high energy photons. The combination of knowledge of electron density with methods for determination of processes, dependent on atomic number, can form a base for adequate composition of phantom materials for purposes of testing dose calculation algorithms for photons and electrons.},
  author       = {Knöös, Tommy and Nilsson, Mats and Ahlgren, Lars},
  issn         = {1879-0887},
  keyword      = {Electron density,Hounsfield number,Dose planning,Radiation therapy},
  language     = {eng},
  number       = {4},
  pages        = {337--345},
  publisher    = {Elsevier},
  series       = {Radiotherapy and Oncology},
  title        = {A method for conversion of hounsfield number to electron density and prediction of macroscopic pair production cross-sections},
  url          = {http://dx.doi.org/10.1016/S0167-8140(86)80183-9},
  volume       = {5},
  year         = {1986},
}