title: Relationship between sharpness and noise in CT images reconstructed with different kernels.
abstract: The sharpness expressed as the full-width at half-maximum of the line spread function (LSF) was derived for different CT scanners and reconstruction kernels. The LSFs were calculated from images of a 0.28 mm tungsten bead and successfully fitted to cumulative Gaussians by means of probit plots. The corresponding image noise was measured in a homogeneous material. The investigation showed that the noise increases strongly for small improvements in sharpness. The method was reproducible and insensitive to small positional shifts of the phantom.
authors.affiliation: The Interventional Centre, Oslo University Hospital, Oslo, Norway.
authors.forename: K
authors.initials: K
authors.lastname: Eldevik
authors.forename: W
authors.initials: W
authors.lastname: Nordhøy
authors.forename: A
authors.initials: A
authors.lastname: Skretting
mesh_terms: D000465:Algorithms; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*