title: Venous vessel boundary delineation at high field using sigmoid-SWI.
abstract: Susceptibility Weighted Imaging (SWI) is an increasingly utilised MRI technique for enhancing image contrast by attenuating magnitude data with a mask derived from the phase data. It is particularly useful for venography, however at higher field strengths, the effects of localised magnetic susceptibility differences lead to ill-defined edges within SWI images and overestimation of widths in large veins oriented perpendicular to the main field. We propose a variation on SWI, sigmoid-SWI, that removes the vessel boundary artefacts, resulting in clearer visibility of edges and more accurate widths of venous vessels.
authors.forename: Amanda
authors.initials: A
authors.lastname: Ng
authors.forename: Gary F
authors.initials: GF
authors.lastname: Egan
authors.forename: Zang-Hee
authors.initials: ZH
authors.lastname: Cho
authors.forename: Leigh A
authors.initials: LA
authors.lastname: Johnston
mesh_terms: D001921:Brain / Q000098:blood supply; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D008279:Magnetic Resonance Imaging; D014680:Veins / Q000033:anatomy & histology*