eprintid: 1431323 rev_number: 36 eprint_status: archive userid: 608 dir: disk0/01/43/13/23 datestamp: 2014-06-04 18:38:12 lastmod: 2021-10-04 01:42:56 status_changed: 2016-08-12 11:10:08 type: article metadata_visibility: show item_issues_count: 0 creators_name: Burdet, N creators_name: Morrison, GR creators_name: Huang, X creators_name: Shi, X creators_name: Clark, JN creators_name: Zhang, F creators_name: Civita, M creators_name: Harder, R creators_name: Robinson, IK title: Observations of artefacts in the x-ray ptychography method ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F64 note: Copyright © 2014 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. abstract: X-ray ptychography, a scanning coherent diffraction imaging method, was used to reconstruct images of a “Siemens star” test pattern with amplitude and phase contrast. While studying how the use of illumination with an increased bandwidth results in clear improvements in the quality of image reconstructions, we found that an artificial change in the overall distance scale factor of the algorithm leads to a systematic response in the image, which is reproduced with an incorrect number of spokes. This pathology is explained by the conflict between the length scales set by the scan and by the diffraction patterns on the detector. date: 2014-05-05 official_url: http://dx.doi.org/10.1364/OE.22.010294 vfaculties: VMPS oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_source: WoS-Lite elements_id: 950130 doi: 10.1364/OE.22.010294 lyricists_name: Morrison, Graeme lyricists_name: Robinson, Ian lyricists_id: GRMOR53 lyricists_id: IKROB22 full_text_status: public publication: Optics Express volume: 22 number: 9 pagerange: 10294 - 10303 issn: 1094-4087 citation: Burdet, N; Morrison, GR; Huang, X; Shi, X; Clark, JN; Zhang, F; Civita, M; ... Robinson, IK; + view all <#> Burdet, N; Morrison, GR; Huang, X; Shi, X; Clark, JN; Zhang, F; Civita, M; Harder, R; Robinson, IK; - view fewer <#> (2014) Observations of artefacts in the x-ray ptychography method. Optics Express , 22 (9) 10294 - 10303. 10.1364/OE.22.010294 <https://doi.org/10.1364/OE.22.010294>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1431323/1/Robinson_Nico_OptExp_submit.pdf