Suzan Meijer
K. Joost Batenburg
Francien G. Bossema
Sophia Bethany Coban
2020-04-10
<p><strong>Summary</strong><br>
This submission contains three tomographic datasets of a fragment of fabric woven in tapestry weave. The data is collected at three different zoom levels to achieve different reconstructed image resolution.<br>
The data is made available as part of [Bossema 2020]. </p>
<p><strong>Apparatus</strong><br>
The dataset is acquired using the custom-built and highly flexible CT scanner, FleX-ray Laboratory, developed by TESCAN-XRE, located at CWI in Amsterdam. This apparatus consists of a cone-beam microfocus X-ray point source that projects polychromatic X-rays onto a 1944-by-1536 pixels, 14-bit, flat detector panel. Full details can be found in [Coban 2020].</p>
<p><strong>Sample Information</strong><br>
The sample is a fragment of woven fabric approximately 7cm x 15cm in size. The fabric was hung vertically on a piece of foam, held on the top by a wooden stick through one of the holes and on the bottom by a piece of plastic tape. See Figure 5 in [Bossema 2020] for a picture of the object and examples of the reconstruction. <br>
</p>
<p><strong>Experimental Plan</strong><br>
The data in this submission was collected to illustrate the use of zooming for the investigation of cultural heritage objects. Three region-of-interest scans of the lower part, containing a hole, were collected at different zoom levels. For each scan, the sample was rotated 360° in circular and continuous motion, with a dark-field (closed-shutter), and flat-field (open-shutter) image taken before the acquisition. Each dataset consists of 1200 projections. The source-detector distance was kept at 1098mm. At the first level of zooming, the object was placed at 963mm from the source yielding a magnification of 1.14 and 131 micron resolution. For the second level the object was moved closer to the source so that the source-object distance was 603mm, yielding a magnification of 1.82 and 82 micron resolution. At the third level, the source-object distance was reduced to 243, yielding a magnification of 4.5 and 33 micron resolution.<br>
All raw data (i.e. no corrections) is made available in .tif format.</p>
<p> </p>
<p><strong>List of Contents</strong></p>
<p>The content of the submission is given below.</p>
<ul>
<li><strong>level1: </strong>lowest resolution scan.</li>
<li><strong>level2:</strong> higher resolution scan.</li>
<li><strong>level3:</strong> highest resolution scan.</li>
</ul>
<p>Each data folder contains:</p>
<ul>
<li>dark-field (or closed-shutter) image, <em>di000000.tif</em>,</li>
<li>flat-field (or open-shutter before acquisition) image, <em>io000000.tif</em>,</li>
<li>raw (unprocessed or uncorrected) projections,<em> scan_*.tif</em>,</li>
<li><em>data settings XRE.txt</em>, a text file with scanner metadata,</li>
<li><em>scan settings.txt</em>, a text file with scanner metadata in a human readable format, and</li>
<li><em>data settings XRE.ini</em>, a snapshot text file of basic geometry information at the start of a scan.</li>
<li><em>script_executed.txt</em>, the text file containing the list of commands the apparatus has executed.</li>
</ul>
<p><strong>Additional Links</strong></p>
<p>These datasets are produced by the <a href="https://www.cwi.nl/research/groups/computational-imaging">Computational Imaging group</a> at Centrum Wiskunde & Informatica (CI-CWI). For any relevant Python/MATLAB scripts for the FleX-ray datasets, we refer the reader to our group's <a href="http://github.com/cicwi">GitHub page</a>.</p>
<p><strong>Contact Details</strong><br>
For more information or guidance in using these datasets, please get in touch with </p>
<ul>
<li>bossema [at] cwi.nl</li>
</ul>
<p><strong>Acknowledgments</strong><br>
We thank Suzan Meijer of the Rijksmuseum for providing this sample.</p>
The authors would like to acknowledge the funding from the Netherlands Organisation for Scientific Research (NWO), project numbers 341-60-001, 639.073.506 and 628.007.033, and Netherlands Institute for Conservation, Art and Science (NICAS).
https://doi.org/10.5281/zenodo.3741311
oai:zenodo.org:3741311
Zenodo
https://zenodo.org/communities/cwi
https://zenodo.org/communities/ci-cwi
https://doi.org/10.5281/zenodo.3741310
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
X-ray tomographic data
Cultural Heritage
FleX-ray Laboratory
Laboratory CT system
Three tomographic CT datasets of a woven fabric
info:eu-repo/semantics/other