Wilfrid KendallThomas NicholsGreg GibbonsJohn ThornbyMark WilliamsTom JinJulia BrettschneiderThe purpose of this blog is to support the work of an interdisciplinary research team which will soon start work on an EPSRC-funded project "Inside-out: Statistical methods for Computed Tomography ...".https://blogs.warwick.ac.uk/insideout/?atom=atomWarwick Blogs, University of Warwick(C) 2024 Wilfrid Kendall2024-03-29T06:47:55ZDetectorChecker by Wilfrid KendallWilfrid Kendallhttps://blogs.warwick.ac.uk/insideout/entry/detectorchecker/2021-01-23T10:05:49Z2019-06-14T14:27:32Z<p class="answer">Writing about web page <a href="https://detectorchecker.azurewebsites.net/" title="Related external link: https://detectorchecker.azurewebsites.net/">https://detectorchecker.azurewebsites.net/</a></p>
<p>Funded by an Alan Turing Institute seed grant, <a href="https://warwick.ac.uk/fac/sci/statistics/staff/academic-research/brettschneider/">Julia Brettschneider</a> and <a href="http://warwick.ac.uk/wsk">Wilfrid Kendall</a> have worked with Martin O’Reilly, Tomas Lazauskas and Oscar Giles of the Turing Research Engineers Group to produce a web app <a href="https://detectorchecker.azurewebsites.net/">DetectorChecker</a> which can be used to help assess the quality of digital X-ray detectors based on spatial analysis of dysfunctional pixels.</p>
<p>The source for the web tool is also available from GitHub in the form of an <a href="https://github.com/alan-turing-institute/DetectorChecker">R package</a> coupled with a <a href="https://github.com/alan-turing-institute/DetectorCheckerWebApp">Shiny application</a>.</p>
<p>A <a href="https://github.com/alan-turing-institute/DetectorCheckerWebApp/blob/master/docs/files/WebApp_user_docs/detectorCheckerManual-WSK_JAB2.pdf">manual</a> is available from the <span class="caps">HELP</span> tab on the web app. The <span class="caps">PDF</span> file <a href="http://warwick.ac.uk/wsk/DetectorChecker2.pdf">DetectorChecker2.pdf</a> gives a quick overview.</p>
<p>We are still improving and extending DetectorChecker and we very much welcome your feedback.</p>
<p><a href="mailto:Julia.Brettschneider@warwick.ac.uk?subject=DetectorChecker%20query">Julia Brettschneider</a></p>
<p><a href="mailto:w.s.kendall@warwick.ac.uk?subject=DetectorChecker%20query">Wilfrid Kendall</a></p><p class="answer">Writing about web page <a href="https://detectorchecker.azurewebsites.net/" title="Related external link: https://detectorchecker.azurewebsites.net/">https://detectorchecker.azurewebsites.net/</a></p>
<p>Funded by an Alan Turing Institute seed grant, <a href="https://warwick.ac.uk/fac/sci/statistics/staff/academic-research/brettschneider/">Julia Brettschneider</a> and <a href="http://warwick.ac.uk/wsk">Wilfrid Kendall</a> have worked with Martin O’Reilly, Tomas Lazauskas and Oscar Giles of the Turing Research Engineers Group to produce a web app <a href="https://detectorchecker.azurewebsites.net/">DetectorChecker</a> which can be used to help assess the quality of digital X-ray detectors based on spatial analysis of dysfunctional pixels.</p>
<p>The source for the web tool is also available from GitHub in the form of an <a href="https://github.com/alan-turing-institute/DetectorChecker">R package</a> coupled with a <a href="https://github.com/alan-turing-institute/DetectorCheckerWebApp">Shiny application</a>.</p>
<p>A <a href="https://github.com/alan-turing-institute/DetectorCheckerWebApp/blob/master/docs/files/WebApp_user_docs/detectorCheckerManual-WSK_JAB2.pdf">manual</a> is available from the <span class="caps">HELP</span> tab on the web app. The <span class="caps">PDF</span> file <a href="http://warwick.ac.uk/wsk/DetectorChecker2.pdf">DetectorChecker2.pdf</a> gives a quick overview.</p>
<p>We are still improving and extending DetectorChecker and we very much welcome your feedback.</p>
<p><a href="mailto:Julia.Brettschneider@warwick.ac.uk?subject=DetectorChecker%20query">Julia Brettschneider</a></p>
<p><a href="mailto:w.s.kendall@warwick.ac.uk?subject=DetectorChecker%20query">Wilfrid Kendall</a></p>1Modelling the Penumbra in Computed Tomography by Wilfrid KendallWilfrid Kendallhttps://blogs.warwick.ac.uk/insideout/entry/modelling_the_penumbra/2016-04-19T15:08:14Z2016-04-19T15:08:14Z<p>Kueh, A., Warnett, J. W., Gibbons, G. J., Brettschneider, J., Nichols, T. E., Williams, M. A., & Kendall, W. S. (2016). Modelling the Penumbra in Computed Tomography. <em>Journal of X-Ray Science and Technology</em>, to appear, 14pp.</p>
<p>BACKGROUND: In computed tomography (CT), spot geometry is one of the main sources of error in CT images. Since X-ray tubes do not arise from a point source, artefacts are produced. In particular there is a penumbra effect, leading to poorly defined edges within a reconstructed volume. Penumbra models can be simulated given a fixed spot geometry and the known experimental setup.</p>
<p> OBJECTIVE: This paper proposes to use a penumbra model, derived from Beer’s law, to confirm spot geometry from penumbra data, as well as quantify blurring in the image. </p>
<p>METHODS: Two models for the spot geometry are considered; one consists of a single Gaussian spot, the other is a mixture model consisting of a Gaussian spot together with a larger uniform spot. </p>
<p>RESULTS: The model consisting of a single Gaussian spot has fits which are poor. The mixture model (which adds a larger uniform spot) exhibits much improved fits. The parameters corresponding to the uniform spot are similar across all powers, and further experiments suggest that the uniform spot produces only soft X-rays of relatively low-energy. </p>
<p>CONCLUSIONS: Thus, the precision of radiographs can be estimated from the penumbra effect in the image. The use of a thin copper filter reduces the size of the effective penumbra.<br />
<br />
</p><p>Kueh, A., Warnett, J. W., Gibbons, G. J., Brettschneider, J., Nichols, T. E., Williams, M. A., & Kendall, W. S. (2016). Modelling the Penumbra in Computed Tomography. <em>Journal of X-Ray Science and Technology</em>, to appear, 14pp.</p>
<p>BACKGROUND: In computed tomography (CT), spot geometry is one of the main sources of error in CT images. Since X-ray tubes do not arise from a point source, artefacts are produced. In particular there is a penumbra effect, leading to poorly defined edges within a reconstructed volume. Penumbra models can be simulated given a fixed spot geometry and the known experimental setup.</p>
<p> OBJECTIVE: This paper proposes to use a penumbra model, derived from Beer’s law, to confirm spot geometry from penumbra data, as well as quantify blurring in the image. </p>
<p>METHODS: Two models for the spot geometry are considered; one consists of a single Gaussian spot, the other is a mixture model consisting of a Gaussian spot together with a larger uniform spot. </p>
<p>RESULTS: The model consisting of a single Gaussian spot has fits which are poor. The mixture model (which adds a larger uniform spot) exhibits much improved fits. The parameters corresponding to the uniform spot are similar across all powers, and further experiments suggest that the uniform spot produces only soft X-rays of relatively low-energy. </p>
<p>CONCLUSIONS: Thus, the precision of radiographs can be estimated from the penumbra effect in the image. The use of a thin copper filter reduces the size of the effective penumbra.<br />
<br />
</p>0Neuroimaging Statistics Research at Warwick by Thomas NicholsThomas Nicholshttps://blogs.warwick.ac.uk/insideout/entry/neuroimaging_statistics_research/2014-02-04T15:06:32Z2013-12-10T20:22:04Z<p class="answer">Writing about web page <a href="http://www.warwick.ac.uk/tenichols/research/neuro-stat" title="Related external link: http://www.warwick.ac.uk/tenichols/research/neuro-stat">http://www.warwick.ac.uk/tenichols/research/neuro-stat</a></p>
<p>There are weekly meetings on Thursdays, 12-1, in Zeeman C1.06 on Neuroimaging Statistics, where we discuss papers and our on-going research. All are welcome to join in! Details of each week's topic are in the referenced web-page.</p><p class="answer">Writing about web page <a href="http://www.warwick.ac.uk/tenichols/research/neuro-stat" title="Related external link: http://www.warwick.ac.uk/tenichols/research/neuro-stat">http://www.warwick.ac.uk/tenichols/research/neuro-stat</a></p>
<p>There are weekly meetings on Thursdays, 12-1, in Zeeman C1.06 on Neuroimaging Statistics, where we discuss papers and our on-going research. All are welcome to join in! Details of each week's topic are in the referenced web-page.</p>0Applied Topology and Stochastic Geometry fortnightly seminar by Wilfrid KendallWilfrid Kendallhttps://blogs.warwick.ac.uk/insideout/entry/applied_topology_and/2014-02-04T15:05:53Z2013-12-10T18:47:13Z<p class="answer">Writing about web page <a href="http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic-research/kueh/topgeomseminar/" title="Related external link: http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic-research/kueh/topgeomseminar/">http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic-research/kueh/topgeomseminar/</a></p>
<p>A fortnightly seminar to survey recent progress in the two fields mentioned in the title. Details in attached web-page. All are welcome.<br />
</p><p class="answer">Writing about web page <a href="http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic-research/kueh/topgeomseminar/" title="Related external link: http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic-research/kueh/topgeomseminar/">http://www2.warwick.ac.uk/fac/sci/statistics/staff/academic-research/kueh/topgeomseminar/</a></p>
<p>A fortnightly seminar to survey recent progress in the two fields mentioned in the title. Details in attached web-page. All are welcome.<br />
</p>0EPSRC announcement by Wilfrid KendallWilfrid Kendallhttps://blogs.warwick.ac.uk/insideout/entry/epsrc_announcement/2013-06-11T12:50:24Z2013-06-11T12:50:05Z<p class="answer">Writing about web page <a href="http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx" title="Related external link: http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx">http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx</a></p>
<p>The grant for this project is one of six forming an announcement on EPSRC's webpages:</p>
<p>http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx<br />
</p><p class="answer">Writing about web page <a href="http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx" title="Related external link: http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx">http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx</a></p>
<p>The grant for this project is one of six forming an announcement on EPSRC's webpages:</p>
<p>http://www.epsrc.ac.uk/newsevents/pubs/mags/connect/2013/90/Pages/futuremanufacturingwithmathematicalsciences.aspx<br />
</p>0Project mentioned in Birmingham Post by Wilfrid KendallWilfrid Kendallhttps://blogs.warwick.ac.uk/insideout/entry/project_mentioned_in/2013-06-05T12:12:18Z2013-06-05T12:12:18Z<p>Scroll to the bottom of</p>
<p><a href="http://www.birminghampost.co.uk/news/local-news/university-warwicks-statistics-work-brain-4042877">http://www.birminghampost.co.uk/news/local-news/university-warwicks-statistics-work-brain-4042877</a><br />
</p><p>Scroll to the bottom of</p>
<p><a href="http://www.birminghampost.co.uk/news/local-news/university-warwicks-statistics-work-brain-4042877">http://www.birminghampost.co.uk/news/local-news/university-warwicks-statistics-work-brain-4042877</a><br />
</p>0£1.6m funding at the interface of statistics, healthcare and manufacturing by Wilfrid KendallWilfrid Kendallhttps://blogs.warwick.ac.uk/insideout/entry/_16m_funding/2013-06-11T12:50:43Z2013-05-23T13:52:33Z<p>See http://www2.warwick.ac.uk/newsandevents/pressreleases/16316m_funding_at/ for a press release partly about the award of this grant. <br />
</p><p>See http://www2.warwick.ac.uk/newsandevents/pressreleases/16316m_funding_at/ for a press release partly about the award of this grant. <br />
</p>0EPSRC Project Proposal by Wilfrid KendallWilfrid Kendallhttps://blogs.warwick.ac.uk/insideout/entry/epsrc_project_proposal/2013-05-14T17:22:41Z2013-05-01T10:54:28Z<p class="answer">Writing about web page <a href="http://gow.epsrc.ac.uk/NGBOViewGrant.aspx?GrantRef=EP/K031066/1" title="Related external link: http://gow.epsrc.ac.uk/NGBOViewGrant.aspx?GrantRef=EP/K031066/1">http://gow.epsrc.ac.uk/NGBOViewGrant.aspx?GrantRef=EP/K031066/1</a></p>
<p><a href="http://go.warwick.ac.uk/wsk/3d-printing/proposal.pdf">Here is a PDF</a> of the successful proposal for this EPSRC-funded project. It is placed here for the benefit of anyone interested in applying for the <a href="https://secure.admin.warwick.ac.uk/webjobs/jobs/research/job16843.html">Statistics PDRA post</a> which currently being advertised.</p><p class="answer">Writing about web page <a href="http://gow.epsrc.ac.uk/NGBOViewGrant.aspx?GrantRef=EP/K031066/1" title="Related external link: http://gow.epsrc.ac.uk/NGBOViewGrant.aspx?GrantRef=EP/K031066/1">http://gow.epsrc.ac.uk/NGBOViewGrant.aspx?GrantRef=EP/K031066/1</a></p>
<p><a href="http://go.warwick.ac.uk/wsk/3d-printing/proposal.pdf">Here is a PDF</a> of the successful proposal for this EPSRC-funded project. It is placed here for the benefit of anyone interested in applying for the <a href="https://secure.admin.warwick.ac.uk/webjobs/jobs/research/job16843.html">Statistics PDRA post</a> which currently being advertised.</p>0