eprintid: 1323175 rev_number: 57 eprint_status: archive userid: 608 dir: disk0/01/32/31/75 datestamp: 2011-09-28 23:36:05 lastmod: 2021-10-23 02:01:40 status_changed: 2017-11-13 14:37:13 type: proceedings_section metadata_visibility: show item_issues_count: 0 creators_name: Ignatyev, K creators_name: Munro, PRT creators_name: Speller, RD creators_name: Olivo, A title: Phase Contrast Imaging with Coded Apertures Using Laboratory-Based X-ray Sources ispublished: pub divisions: UCL divisions: B04 divisions: C05 divisions: F42 note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. abstract: X‐ray phase contrast imaging is a powerful technique that allows detection of changes in the phase of x‐ray wavefronts as they pass through a sample. As a result, details not visible in conventional x‐ray absorption imaging can be detected. Until recently the majority of applications of phase contrast imaging were at synchrotron facilities due to the availability of their high flux and coherence; however, a number of techniques have appeared recently that allow phase contrast imaging to be performed using laboratory sources. Here we describe a phase contrast imaging technique, developed at University College London, that uses two coded apertures. The x‐ray beam is shaped by the pre‐sample aperture, and small deviations in the x‐ray propagation direction are detected with the help of the detector aperture. In contrast with other methods, it has a much more relaxed requirement for the source size (it works with source sizes up to 100 μm). A working prototype coded‐aperture system has been built. An x‐ray detector with directly deposited columnar CsI has been used to minimize signal spill‐over into neighboring pixels. Phase contrast images obtained with the system have demonstrated its effectiveness for imaging low‐absorption materials. date: 2011-09-09 date_type: published publisher: American Institute of Physics (AIP) official_url: http://dx.doi.org/10.1063/1.3625352 vfaculties: VENG oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_source: WoS-Lite elements_id: 341269 doi: 10.1063/1.3625352 isbn_13: 9780735409255 lyricists_name: Ignatyev, Konstantin lyricists_name: Munro, Peter lyricists_name: Olivo, Alessandro lyricists_name: Speller, Robert lyricists_id: IKONS20 lyricists_id: PRTMU72 lyricists_id: AOLIV86 lyricists_id: RDSPE08 actors_name: Olivo, Alessandro actors_name: Allington-Smith, Dominic actors_id: AOLIV86 actors_id: DAALL44 actors_role: owner actors_role: impersonator full_text_status: public series: AIP Conference Proceedings publication: 10TH INTERNATIONAL CONFERENCE ON X-RAY MICROSCOPY volume: 1365 place_of_pub: Chicago, IL, USA pagerange: 254-257 pages: 4 event_title: 10th International Conference on X‐ray Microscopy event_location: Univ Chicago, Chicago, IL event_dates: 15 August 2010 - 20 August 2010 institution: 10th International Conference on X-ray Microscopy issn: 0094-243X book_title: Proceedings of the 10th International Conference on X‐ray Microscopy editors_name: McNulty, I editors_name: Eyberger, C editors_name: Lai, B citation: Ignatyev, K; Munro, PRT; Speller, RD; Olivo, A; (2011) Phase Contrast Imaging with Coded Apertures Using Laboratory-Based X-ray Sources. In: McNulty, I and Eyberger, C and Lai, B, (eds.) Proceedings of the 10th International Conference on X‐ray Microscopy. (pp. pp. 254-257). American Institute of Physics (AIP): Chicago, IL, USA. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1323175/1/Olivo_1.3625352.pdf