title: X-ray absorption, phase and dark-field tomography through a beam tracking approach.
abstract: We present a development of the beam-tracking approach that allows its implementation in computed tomography. One absorbing mask placed before the sample and a high resolution detector are used to track variations in the beam intensity distribution caused by the sample. Absorption, refraction, and dark-field are retrieved through a multi-Gaussian interpolation of the beam. Standard filtered back projection is used to reconstruct three dimensional maps of the real and imaginary part of the refractive index, and of the dark-field signal. While the method is here demonstrated using synchrotron radiation, its low coherence requirements suggest a possible implementation with laboratory sources.
authors.affiliation: Department of Medical Physics and Biomedical Engineering, University College London, Malet Place, Gower Street, WC1E 6BT London, United Kingdom.|Research Complex at Harwell, Harwell Oxford Campus, OX11 0FA Didcot, United Kingdom.
authors.forename: Fabio A
authors.initials: FA
authors.lastname: Vittoria
authors.affiliation: Department of Medical Physics and Biomedical Engineering, University College London, Malet Place, Gower Street, WC1E 6BT London, United Kingdom.
authors.forename: Marco
authors.initials: M
authors.lastname: Endrizzi
authors.affiliation: Department of Medical Physics and Biomedical Engineering, University College London, Malet Place, Gower Street, WC1E 6BT London, United Kingdom.|Research Complex at Harwell, Harwell Oxford Campus, OX11 0FA Didcot, United Kingdom.
authors.forename: Paul C
authors.initials: PC
authors.lastname: Diemoz
authors.affiliation: Department of Medical Physics and Biomedical Engineering, University College London, Malet Place, Gower Street, WC1E 6BT London, United Kingdom.
authors.forename: Anna
authors.initials: A
authors.lastname: Zamir
authors.affiliation: Diamond Light Source, Harwell Oxford Campus, OX11 0DE Didcot, United Kingdom.
authors.forename: Ulrich H
authors.initials: UH
authors.lastname: Wagner
authors.affiliation: Diamond Light Source, Harwell Oxford Campus, OX11 0DE Didcot, United Kingdom.
authors.forename: Christoph
authors.initials: C
authors.lastname: Rau
authors.affiliation: Research Complex at Harwell, Harwell Oxford Campus, OX11 0FA Didcot, United Kingdom.|London Centre for Nanotechnology, WC1H 0AH London, United Kingdom.
authors.forename: Ian K
authors.initials: IK
authors.lastname: Robinson
authors.affiliation: Department of Medical Physics and Biomedical Engineering, University College London, Malet Place, Gower Street, WC1E 6BT London, United Kingdom.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Olivo