{"id":1755,"date":"2019-01-18T13:51:34","date_gmt":"2019-01-18T13:51:34","guid":{"rendered":"http:\/\/www.finden.co.uk\/?page_id=1755"},"modified":"2020-07-15T14:28:21","modified_gmt":"2020-07-15T14:28:21","slug":"towards-artefact-free-x-ray-diffraction-tomography-images","status":"publish","type":"page","link":"https:\/\/www.finden.co.uk\/zh\/towards-artefact-free-x-ray-diffraction-tomography-images\/","title":{"rendered":"Towards artefact-free X-ray diffraction tomography images"},"content":{"rendered":"

Case Study: Towards artefact-free X-ray diffraction tomography images<\/h3>\n

Companies involved:<\/strong><\/h4>\n

Finden Ltd, University College London, ESRF<\/p>\n

Challenge:<\/strong><\/h4>\n

In X-ray diffraction computed tomography (XRD-CT), large crystallites can produce spots on top of the powder diffraction rings, which after data integration and tomographic reconstruction, lead to line\/streak artefacts in the tomograms. This is a major issue as the chemical information present in the XRD-CT can be lost.<\/p>\n

\"Figure<\/a><\/p>\n

 <\/p>\n

Sample:<\/strong><\/h4>\n

Mn-Na-W\/SiO2<\/sub> catalyst (powder form) in combination with a BCFZ perovskite hollow-fibre ceramic membrane.<\/p>\n

Solution:<\/strong><\/h4>\n

We developed a new data processing strategy to remove the line or \u201cstreak\u201d artefacts generated in reconstructed XRD-CT images due to the presence of large crystallites in the sample. In our simple approach, we take the polar transform of collected 2D diffraction patterns followed by directional median\/mean filtering prior to integration, yielding artefact-free images. For example, in this specific materials system, after the filtering process, we were able to observe that the Mn-Na-W\/SiO2<\/sub> catalyst chemically interacts with the BCFZ membrane forming a new stable phase, identified as BaWO4<\/sub>. Such information is crucial for the design of improved catalytic membrane reactors that exhibit long-term stability.<\/p>\n

Benefits:<\/strong><\/h4>\n

The line or \u201cstreak\u201d artefacts are very common in XRD-CT data. Finden scientists have the necessary technical tools to remove such artefacts and generate artefact-free images where the chemical information is preserved.<\/p>\n

\"Figure<\/a><\/p>\n

Further reading:<\/h4>\n

Removing multiple outliers and single-crystal artefacts from X-ray diffraction computed tomography data<\/em><\/strong><\/a> A. Vamvakeros, S.D M. Jacques, M. Di Michiel, V. Middelkoop, C. K. Egan, R. J. Cernik and A.M. Beale. Journal of Applied Crystallography (2015) 48, 1943<\/p>\n

 <\/p>\n

\n

\"EU<\/a><\/p>\n

 <\/p>\n

The research project receives funding from the European Community\u2018s Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under grant agreement no. 679933.<\/p>\n

 <\/p>\n

\n

Read more about our team<\/a> and further\u00a0publications.<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Case Study: Towards artefact-free X-ray diffraction tomography images Companies involved: Finden Ltd, University College London, ESRF Challenge: In X-ray diffraction computed tomography (XRD-CT), large crystallites can produce spots on top of the powder diffraction rings, which after data integration and tomographic reconstruction, lead to line\/streak artefacts in the tomograms. This is a major issue as […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-1755","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/pages\/1755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/comments?post=1755"}],"version-history":[{"count":11,"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/pages\/1755\/revisions"}],"predecessor-version":[{"id":2729,"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/pages\/1755\/revisions\/2729"}],"wp:attachment":[{"href":"https:\/\/www.finden.co.uk\/zh\/wp-json\/wp\/v2\/media?parent=1755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}