title: X-ray tomography using the full complex index of refraction.
abstract: We report on x-ray tomography using the full complex index of refraction recorded with a grating-based x-ray phase-contrast setup. Combining simultaneous absorption and phase-contrast information, the distribution of the full complex index of refraction is determined and depicted in a bivariate graph. A simple multivariable threshold segmentation can be applied offering higher accuracy than with a single-variable threshold segmentation as well as new possibilities for the partial volume analysis and edge detection. It is particularly beneficial for low-contrast systems. In this paper, this concept is demonstrated by experimental results.
authors.affiliation: Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark.
authors.forename: M S
authors.initials: MS
authors.lastname: Nielsen
authors.forename: T
authors.initials: T
authors.lastname: Lauridsen
authors.forename: M
authors.initials: M
authors.lastname: Thomsen
authors.forename: T H
authors.initials: TH
authors.lastname: Jensen
authors.forename: M
authors.initials: M
authors.lastname: Bech
authors.forename: L B
authors.initials: LB
authors.lastname: Christensen
authors.forename: E V
authors.initials: EV
authors.lastname: Olsen
authors.forename: M
authors.initials: M
authors.lastname: Hviid
authors.forename: R
authors.initials: R
authors.lastname: Feidenhans'l
authors.forename: F
authors.initials: F
authors.lastname: Pfeiffer
mesh_terms: D000042:Absorption; D000273:Adipose Tissue / Q000000981:diagnostic imaging; D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D004583:Electrons; D007091:Image Processing, Computer-Assisted; D009132:Muscles / Q000000981:diagnostic imaging; D012542:Scattering, Radiation; D014057:Tomography, X-Ray Computed / Q000379:methods*