• Disease
  • Topographical
  • Topographical Density
  • Petr Vanek

    Prominent publications by Petr Vanek

    KOL Index score: 4517

    OBJECTIVES: CT angiography (CTA) is recommended as a standard of stroke imaging. We investigated accuracy and precision of standard or single-phase CTA as compared with novel technique or multiphase CTA in clot detection in the middle cerebral artery.

    METHODS: Twenty single-phase CTA and twenty multiphase CTA with prevailing M2 occlusion were assessed by 10 radiologists and 10 neurologists blinded to clinical information (7 less experienced and 3 experienced). Sensitivity, specificity, ...

    Also Ranks for: Multiphase Cta |  sensitivity specificity |  stroke imaging |  single phase |  tomography angiography
    KOL Index score: 3127

    In geoid computation, effects of real three-dimensional topographic masses on the Earth’s gravity field must be accurately quantified and, in the Stokes–Helmert scheme, replaced with effects of those masses condensed on the geoid. The most comprehensive modern schemes for evaluation of topographical effects account for terrain effects, use a spherical model of topography, and incorporate two-dimensionally varying models of topographical mass density. In this contribution, we employ a ...

    Also Ranks for: Topographical Density |  geoidal height |  geoid computation |  gravity potential |  helmert scheme
    KOL Index score: 1504

    The precision and accuracy of positions obtained from the least-squares adjustment of Global Positioning System (GPS) data are dependent on the fidelity of the algorithms used to model the data. They are also dependent on the a priori covariance matrix of the data that is used in the adjustment. This matrix describes not only the uncertainty of the data but also the correlation among themboth mathematical and physical. In this paper we present a summary of a study of the effect of ...

    Also Ranks for: Gps Data |  leastsquares adjustment |  covariance matrix
    KOL Index score: 730

    Statistically rigorous densification of horizontal geodetic networks must consist of a simultaneous adjustment of both the densification and the densified networks. Equivalently, the effect of the already adjusted existing network to be densified may be rigorously propagated into the densification network, through an appropriately derived weight matrix of the common station positions. The nonrigorous schemes utilize information available on the existing network in a statistically ...

    Also Ranks for: Densification Network |  simultaneous adjustment


    Petr Vanek: Influence Statistics

    Sample of concepts for which Petr Vanek is among the top experts in the world.
    Concept World rank
    effects geoidal height #5
    geoidal height #15
    topographical density #15
    direct topographical #17
    network statistically #26
    densification network #26
    correlations gps #36
    multiphase cta #67
    singlephase cta #82

    Key People For Topographical Density

    Top KOLs in the world
    Petr Vaníček
    downward continuation truncated geoid eastern canada
    Spiros D Pagiatakis
    superconducting gravimeter stochastic model ionospheric dynamics
    Jianliang Huang
    vertical datum north america western canada
    W Brink
    topographical density canadian rocky mountains gravity geoid
    Walter D Mooney
    crustal structure upper mantle north america
    Will E Featherstone
    australian height datum new zealand western australia

    Petr Vanek:Expert Impact

    Concepts for whichPetr Vanekhas direct influence:Topographical density,  Multiphase cta,  Singlephase cta,  Geoidal height,  Effects geoidal height,  Stroke imaging,  Densification network,  Geoid computation.

    Petr Vanek:KOL impact

    Concepts related to the work of other authors for whichfor which Petr Vanek has influence:Acute stroke,  Conventional mcta,  Tomography angiography,  Endovascular thrombectomy,  Gravity anomaly,  Multiphase cta,  Quasigeoid geoid.



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    Faculty of Medicine, Masaryk University, Brno, Czech Republic | Department of Geodesy and Geomatics Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada. | PhD, Prof., Geodetic Res. Lab., Dept. of Geodesy and Geomatics Engrg., Un