title: Non-linear regularized phase retrieval for unidirectional X-ray differential phase contrast radiography.
abstract: Phase retrieval from unidirectional radiographic differential phase contrast images requires integration of noisy data. A method is presented, which aims to suppress stripe artifacts arising from direct image integration. It is purely algorithmic and therefore, compared to alternative approaches, neither additional alignment nor an increased scan time is required. We report on the theory of this method and present results using numerical as well as experimental data. The method shows significant improvements on the phase retrieval accuracy and enhances contrast in the phase image. Due to its general applicability, the proposed method provides a valuable tool for various 2D imaging applications using differential data.
authors.affiliation: Swiss Light Source, Paul Scherrer Institut, Villigen PSI, Switzerland.
authors.forename: Thomas
authors.initials: T
authors.lastname: Thüring
authors.forename: Peter
authors.initials: P
authors.lastname: Modregger
authors.forename: Bernd R
authors.initials: BR
authors.lastname: Pinzer
authors.forename: Zhentian
authors.initials: Z
authors.lastname: Wang
authors.forename: Marco
authors.initials: M
authors.lastname: Stampanoni
mesh_terms: D000465:Algorithms; D016247:Information Storage and Retrieval / Q000379:methods*; D017711:Nonlinear Dynamics; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D014961:X-Ray Diffraction / Q000379:methods*