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Evaluation of optimally designed planar-concave collimators in single-photon emission tomography

Kimiaei, Shahrok; Ljungberg, Michael LU and Larsson, Stig A (1997) In European Journal Of Nuclear Medicine 24(11). p.1398-1404
Abstract
The imaging properties of optimally designed planar-concave (PC) collimators were evaluated by means of Monte Carlo simulations. The evaluation was done with respect to total system spatial resolution and the overall image noise distribution in single-photon emission tomography. The results showed that the non-isotropy with PC collimators, assessed by the ratio of the full-width at half-maximum in the radial and tangential directions, was reduced by about 60% as compared with a conventional parallel-hole collimator for sources located 200 mm away from the centre of rotation. Furthermore, the image noise distribution along the object radius became more uniform when the curved collimator was used. The maximum increase in noise due to use of... (More)
The imaging properties of optimally designed planar-concave (PC) collimators were evaluated by means of Monte Carlo simulations. The evaluation was done with respect to total system spatial resolution and the overall image noise distribution in single-photon emission tomography. The results showed that the non-isotropy with PC collimators, assessed by the ratio of the full-width at half-maximum in the radial and tangential directions, was reduced by about 60% as compared with a conventional parallel-hole collimator for sources located 200 mm away from the centre of rotation. Furthermore, the image noise distribution along the object radius became more uniform when the curved collimator was used. The maximum increase in noise due to use of the curved collimator was about 45% close to the edge of the phantom, where the hole length was about 3 times longer. We also showed with Monte Carlo simulations that the spatial resolution of the lateral cortex when using the curved collimator was significantly improved due to improved radial resolution. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Spatial resolution, Conventional parallel-hole collimator, Planar-concave collimator, Image noise distribution, Single-photon emission tomography
in
European Journal Of Nuclear Medicine
volume
24
issue
11
pages
1398 - 1404
publisher
Springer
external identifiers
  • pmid:9371873
  • scopus:0030694453
ISSN
1432-105X
DOI
10.1007/s002590050166
language
English
LU publication?
yes
id
983b202c-9d1e-4c4f-aa19-ad6bef3056cf (old id 1111888)
date added to LUP
2008-07-18 14:57:32
date last changed
2017-01-01 04:48:52
@article{983b202c-9d1e-4c4f-aa19-ad6bef3056cf,
  abstract     = {The imaging properties of optimally designed planar-concave (PC) collimators were evaluated by means of Monte Carlo simulations. The evaluation was done with respect to total system spatial resolution and the overall image noise distribution in single-photon emission tomography. The results showed that the non-isotropy with PC collimators, assessed by the ratio of the full-width at half-maximum in the radial and tangential directions, was reduced by about 60% as compared with a conventional parallel-hole collimator for sources located 200 mm away from the centre of rotation. Furthermore, the image noise distribution along the object radius became more uniform when the curved collimator was used. The maximum increase in noise due to use of the curved collimator was about 45% close to the edge of the phantom, where the hole length was about 3 times longer. We also showed with Monte Carlo simulations that the spatial resolution of the lateral cortex when using the curved collimator was significantly improved due to improved radial resolution.},
  author       = {Kimiaei, Shahrok and Ljungberg, Michael and Larsson, Stig A},
  issn         = {1432-105X},
  keyword      = {Spatial resolution,Conventional parallel-hole collimator,Planar-concave collimator,Image noise distribution,Single-photon emission tomography},
  language     = {eng},
  number       = {11},
  pages        = {1398--1404},
  publisher    = {Springer},
  series       = {European Journal Of Nuclear Medicine},
  title        = {Evaluation of optimally designed planar-concave collimators in single-photon emission tomography},
  url          = {http://dx.doi.org/10.1007/s002590050166},
  volume       = {24},
  year         = {1997},
}