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Träfflista för sökning "WFRF:(Zagal Juan Cristobal) srt2:(2000)"

Sökning: WFRF:(Zagal Juan Cristobal) > (2000)

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1.
  • Björkman, Eva, et al. (författare)
  • Evaluation of design options for the scale-space primal sketch analysis of brain activation images
  • 2000
  • Konferensbidrag (refereegranskat)abstract
    • A key issue in brain imaging concerns how to detect the functionally activated regions from PET and fMRI images. In earlier work, it has been shown that the scale-space primal sketch provides a useful tool for such analysis [1]. The method includes presmoothing with different filter widths and automatic estimation of the spatial extent of the activated regions (blobs).The purpose is to present two modifications of the scale-space primal sketch, as well as a quantitative evaluation which shows that these modifications improve the performance, measured as the separation between blob descriptors extracted from PET images and from noise images. This separation is essential for future work of associating a statistical p-value with the scale-space blob descriptors.
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2.
  • Zagal, Juan Cristobal, et al. (författare)
  • Signficance determination for the scale-space primal sketch by comparison of statistics of scale-space blob volumes computed from PET signals vs. residual noise
  • 2000
  • Konferensbidrag (refereegranskat)abstract
    • A dominant approach to brain mapping is to define functional regions in the brain by analyzing brain activation images obtained by PET or fMRI. In [1], it has been shown that the scale-space primal sketch provides a useful tool for such analysis. Some attractive properties of this method are that it only makes few assumptions about the data and the process for extracting activations is fully automatic.In the present version of the scale-space primal sketch, however, there is no method for determining p-values. The purpose here is to present a new methodology for addressing this question, by introducing a descriptor referred to as the -curve, which serves as a first step towards determining the probability of false positives, i.e. alpha.
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  • Resultat 1-2 av 2
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konferensbidrag (2)
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refereegranskat (2)
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Björkman, Eva (2)
Lindeberg, Tony, 196 ... (2)
Zagal, Juan Cristoba ... (2)
Roland, P (1)
Roland, Per E. (1)
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Kungliga Tekniska Högskolan (2)
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Engelska (2)
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Naturvetenskap (2)
Medicin och hälsovetenskap (2)
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2000 (2)Ta bort avgränsningen

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