Title:
PHASE-CONTRAST IMAGING METHOD FOR ESTIMATING THE LOCAL STOICHIOMETRY OF A SAMPLE
Document Type and Number:
WIPO Patent Application WO/2023/117376
Kind Code:
A1
Abstract:
The invention relates to a phase-contrast imaging method for estimating the local stoichiometry of a sample by determining a parameter δ of a real part and an imaginary part β of a complex optical index of the sample; said method being implemented by using an X-ray source to illuminate the sample arranged between the source and a detector, a grating formed of holes arranged between the sample and the detector, and a signal processing unit for processing signals from the detector; the method comprising the following steps: - performing at least one measurement while illuminating the sample, the X-rays reaching the detector forming a spot for each hole of the grating; - for each measurement and for each hole of the grating, independently analysing the spot formed on the grating by determining a barycenter of the spot by using a centroid-finding technique - determining an offset of the barycenter relative to a reference barycenter and subsequently determining a local phase variation on the basis of the offset of the barycenter; - determining an amplitude of the X-rays forming the spot and subsequently determining a local attenuation relative to a reference amplitude; - determining the parameter δ on the basis of the local phase variation; and - determining the imaginary part β on the basis of the local attenuation.
Inventors:
ZEITOUN PHILIPPE (FR)
Application Number:
PCT/EP2022/084261
Publication Date:
June 29, 2023
Filing Date:
December 02, 2022
Export Citation:
Assignee:
ECOLE POLYTECH (FR)
ECOLE NAT SUPERIEURE DES TECHNIQUES AVANCEES (FR)
CENTRE NAT RECH SCIENT (FR)
ECOLE NAT SUPERIEURE DES TECHNIQUES AVANCEES (FR)
CENTRE NAT RECH SCIENT (FR)
International Classes:
G01N23/041; G01N23/087
Foreign References:
| US20140185896A1 | 2014-07-03 | |||
| EP2934320A1 | 2015-10-28 | |||
| US20150110247A1 | 2015-04-23 | |||
| US6950493B2 | 2005-09-27 |
Other References:
BEGANI PROVINCIALI GINEVRA ET AL: "Phase-Contrast Tomography with X-ray Hartmann wavefront sensor", INTERNATIONAL CONFERENCE ON X-RAY LASERS 2020, 8 July 2021 (2021-07-08), XP055949538, ISBN: 978-1-5106-4619-3, DOI: 10.1117/12.2593107
JUERGEN FORNARO ET AL.: "Dual- and multi-energy CT: approach to functional imaging", EUROPEAN SOCIETY OF RADIOLOGY, 2011
PETER R.T. MUNRO ET AL.: "A simplified approach to quantitative coded aperture X-ray phase imaging", OPTICAL SOCIETY OF AMERICA, 2013
FABIO A. VITTORIA ET AL.: "Multimodal Phase-Based X-Ray Microtomography with Nonmi-crofocal Laboratory Sources", PHYSICAL REVIEW APPLIED, vol. 8, 2017, pages 064009
LEHAROLD H. WEN ET AL.: "Single-shot x-ray differential phase-contrast and diffraction imaging using two-dimensional transmission gratings", OPTICS LETTERS, vol. 35, no. 12, 15 June 2010 (2010-06-15), XP001554817, DOI: 10.1364/OL.35.001932
JUERGEN FORNARO ET AL.: "Dual- and multi-energy CT: approach to functional imaging", EUROPEAN SOCIETY OF RADIOLOGY, 2011
PETER R.T. MUNRO ET AL.: "A simplified approach to quantitative coded aperture X-ray phase imaging", OPTICAL SOCIETY OF AMERICA, 2013
FABIO A. VITTORIA ET AL.: "Multimodal Phase-Based X-Ray Microtomography with Nonmi-crofocal Laboratory Sources", PHYSICAL REVIEW APPLIED, vol. 8, 2017, pages 064009
LEHAROLD H. WEN ET AL.: "Single-shot x-ray differential phase-contrast and diffraction imaging using two-dimensional transmission gratings", OPTICS LETTERS, vol. 35, no. 12, 15 June 2010 (2010-06-15), XP001554817, DOI: 10.1364/OL.35.001932
Attorney, Agent or Firm:
IPAZ (FR)
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