November 1, 2023 Dataset Restricted Access

Kulenkampff, Johannes

MARC21 XML Export

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    <subfield code="a">µCT data of two drill cores of fractured crystalline rock (Grimsel)</subfield>
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    <subfield code="a">&lt;p&gt;Two crystalline rock drill cores from the Grimsel site were scanned with a Nikon XT H 225 - scanner. The samples were prepared (formatted and cast in epoxy) by UJV Rez, Czech Republic. The CT-data were acquired and processed at HZDR-FWOT.&lt;/p&gt;

&lt;p&gt;Sample 1 (GAM_UJV_1C_1) contains a complex system of interconnected fractures.&lt;br&gt;
Sample 2 (GAM_UJV_1C_2) contains one single end-to-end fracture with larger aperture.&lt;/p&gt;

&lt;p&gt;Size of both samples: Diameter 80 mm, length 165 mm.&lt;/p&gt;

&lt;p&gt;Two tomograms were acquired for both samples:&lt;br&gt;
1) Complete drill core as one scan, voxel size ca. 75 &amp;micro;m.&lt;br&gt;
2) HR-tomogram merged from three sections with maximum resolution, voxel size ca. 40 &amp;micro;m.&lt;/p&gt;

&lt;p&gt;The tomograms were stored as 3D-raw files. Data format, acquisition parameters, and processing workflow, are documented in the tomogram header files (nrrd-format (text):&amp;nbsp; see https://teem.sourceforge.net/nrrd/format.html).&lt;br&gt;
This data format is importable into open-source visualization programs as 3D slicer (https://www.slicer.org) or Paraview (https://www.paraview.org). The data processing has been conducted with Avizo (https://www.thermofisher.com/de/de/home/electron-microscopy/products/software-em-3d-vis/avizo-software.html).&lt;/p&gt;

&lt;p&gt;Files:&lt;br&gt;
Sample 1&lt;br&gt;
GAM_UJV_1C_1_complet-2_01_NLM: Graylevel image of complete sample, ring artifact removal, non-local-means filter&lt;br&gt;
GAM_UJV_1C_1_complet-2_01_thresholded: Tentative label image of complete sample, threshold segmentation with manual edit&lt;br&gt;
Merged-GAM_UJV_1C_1_HR.Frac_section: Graylevel image of merged fracture section, unfiltered&lt;br&gt;
Merged-GAM_UJV_1C_1_HR.Frac_section.Threshold: Tentative label image of merged fracture section, adaptive threshold segmentation with manual edit&lt;br&gt;
GAM_UJV_1C_1_complet_2.png: Figure of complete sample&amp;nbsp;&lt;br&gt;
GAM_UJV_1C_1_HR_Frac_Y2.png: Figure of merged high-resolution tomogram&lt;/p&gt;

&lt;p&gt;Sample 2&lt;br&gt;
GAM_UJV_1C_2_complet_01.filtered: Graylevel image of complete sample, ring artifact removal, non-local-means filter&lt;br&gt;
GAM_UJV_1C_2_complet_01.filtered.thresholded: Tentative label image of complete sample, &amp;nbsp;threshold segmentation with manual edit&lt;br&gt;
Merged-GAM_UJV_1C_2_A_01.Frac_section.filtered: Graylevel image of merged fracture section, ring artifact removal, non-local-means filter&lt;br&gt;
Merged-GAM_UJV_1C_2_A_01.Frac_section.filtered.segm: Tentative label image of merged fracture section, threshold segmentation with manual edit&lt;br&gt;
GAM_UJV_1C_2_complett_2.png: Figure of complete sample&lt;br&gt;
GAM_UJV_1C_2_HR_Frac_Y2.png: Figure of merged high-resolution tomogram&lt;/p&gt;

&lt;p&gt;Original acquistion data are stored on the HZDR bulk data storage system and available for reprocessing on request.&lt;/p&gt;

&lt;p&gt;&lt;br&gt;
Financial support was granted from the European Union&amp;rsquo;s Horizon 2020 research and innovation program under grant agreement No. 847593 (EURAD, WP FUTURE, task 2.2).&lt;br&gt;
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