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Search: L773:1619 7089 > (1997-1999)

  • Result 1-9 of 9
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1.
  • Andersson, JLR, et al. (author)
  • A multivariate approach to registration of dissimilar tomographic images
  • 1999
  • In: European Journal of Nuclear Medicine. - : SPRINGER VERLAG. - 0340-6997 .- 1432-105X .- 1619-7070 .- 1619-7089. ; 26:7, s. 718-733
  • Journal article (peer-reviewed)abstract
    • We devised a method to allow for retrospective registration of tomographic images with very different information content, the main emphasis being on sets of positron emission tomography images obtained with different tracers. A multivariate cost-function
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  • Kimiaei, Shahrok, et al. (author)
  • Evaluation of optimally designed planar-concave collimators in single-photon emission tomography
  • 1997
  • In: European Journal Of Nuclear Medicine. - : Springer Science and Business Media LLC. - 1432-105X .- 1619-7070 .- 1619-7089. ; 24:11, s. 1398-1404
  • Journal article (peer-reviewed)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.
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  • Result 1-9 of 9

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