A single- and two-tile tomographic micro-CT data of the terracotta sculpture "the Torso"

<strong>Summary</strong> This submission contains two (<em><strong>single-tile</strong></em> and <strong><em>two-tile</em></strong>) tomographic dataset of the terracotta object, the "Torso". This data was collected as part of a larger project including a series of similar terracotta objects (of various body parts), more information can be found in [Scholten 2014]. The data is made available as part of Case Study 1 in [Coban 2020]. <strong>Apparatus</strong> 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]. <strong>Sample Information</strong> The sample is a terracotta object from the series of various body parts collection by the sculptor Johan Gregor van der Schardt. The sample in particular is called "Torso", which is a hollow clay statue, originally believed to have been created using two moulds of clay put together. The sample was mounted in a bed of foam, and secured with 2 thin plastic sticks through the legs of the statue. This was done to dampen any vibrations from the rotation while the statue is mounted upright. See Figure 4 in [Coban 2020] for photos of the sample in mount.<br> <strong>Experimental Plan</strong> The data in this submission was collected via the technique of explorative imaging, in which data is collected upon discussion with the expert and any intermediate reconstruction results. The experiments included in this upload first starts off with a single tile, binned acquisition. The sample is then zoomed in and data is collected in two halves (two detector tiles) to capture details in higher resolution. More information on this process is given in Section 3.1 in [Coban 2020]. For both experiments, the sample is rotated 360° in circular and continuous motion, with a dark-field (closed-shutter), and 2 flat-field (open-shutter) images taken before and after the acquisition. For the first experiment, <em><strong>single-tile</strong></em>, we collected 1200 projections at 136 micron resolution (size of each pixel on detector plane). For the second experiment, the object was moved closed to the source, and the data was collected in two tiles (spatial tiles in detector space). Each tiled-data folder contains 2001 projections at 50 spatial resolution. All raw data (i.e. no corrections) is made available in .tif format. <strong>List of Contents</strong> The contents of the submission is given below. <strong>single-tile</strong>: A "low" resolution scan, taken to answer the initial question. <strong>two-tiles:</strong> A higher resolution scan for studying the finer details such as toolmarks on the interior of the statue; contains <strong><em>t1</em></strong> and <strong><em>t2</em></strong> for tile 1 (top) and tile 2 (bottom) respectively. Each data folder contains dark-field (or closed-shutter) image, <em>di0000.tif,</em> pre flat-field (or open-shutter before acqusition) image, <em>io0000.tif</em>, post flat-field (or open-shutter after acqusition) image, <em>io0001.tif</em>, raw (unprocessed or uncorrected) projections, <em>scan_*.tif</em>, <em>data settings XRE.txt</em>, a text file with scanner metadata, <em>scan settings.txt</em>, a text file with scanner metadata in more human readeable format, and <em>data settings XRE.ini</em>, a snapshot text file of basic geometry information at the start of a scan. <em>script.txt</em> and <em>script_executed.txt</em> are the text files containing the list of commands the apparatus has executed. <strong>Additional Links</strong> These datasets are produced by the Computational Imaging group at Centrum Wiskunde &amp; Informatica (CI-CWI). For any relevant Python/MATLAB scripts for the FleX-ray datasets, we refer the reader to our group's GitHub page. <strong>Contact Details</strong> For more information or guidance in using these dataset, please get in touch with s.b.coban [at] cwi.nl <strong>Acknowledgments</strong> We thank Isabelle Garachon of Rijksmuseum for providing this extra-ordinary sample.**摘要** 本提交内容包含两件（单视场（single-tile）与双视场（two-tile））陶制塑像“躯干（Torso）”的断层扫描数据集。本数据隶属于一项包含一系列同类陶制身体部位塑像的大型研究项目，更多相关信息可参阅[Scholten 2014]。该数据集作为[Coban 2020]中的案例研究1公开发布。 **实验设备** 本数据集使用由阿姆斯特丹CWI的TESCAN-XRE公司研发的定制化高柔性CT扫描仪FleX-ray Laboratory采集。该设备采用锥束微焦点X射线点光源，将多色X射线投射至尺寸为1944×1536像素、位深14位的平板探测器面板。完整设备细节可参阅[Coban 2020]。 **样本信息** 本次样本为雕塑家约翰·格雷戈尔·范·德·沙德特（Johan Gregor van der Schardt）创作的系列陶制身体部位塑像之一，名为“躯干（Torso）”，为空心黏土塑像，最初被认为是通过两块黏土模具拼接制成。样本被固定于泡沫基座中，并通过塑像腿部穿入两根细塑料杆加以固定，以抑制塑像直立扫描时旋转带来的振动。样本安装状态的实拍图可参见[Coban 2020]中的图4。 **实验方案** 本提交的数据通过探索性成像技术采集，该技术需结合专家意见与中间重建结果开展数据采集。本次上传的实验首先开展单视场（single-tile）的降采集成像。随后将样本放大对焦，采用双探测器视场分两部分采集数据，以获取更高分辨率的细节信息。该流程的更多细节可参阅[Coban 2020]的3.1节。两项实验中，样本均以连续圆周运动旋转360°，采集前后共拍摄一张暗场（快门关闭）图像与两张平场（快门开启）图像。首次实验为单视场扫描，共采集1200幅投影图像，分辨率为136微米（探测器平面上的单像素尺寸）。第二次实验中，物体被移至靠近射线源的位置，采用双视场采集数据。每个视场数据文件夹包含2001幅投影图像，分辨率为50微米。所有原始数据（即未经过任何校正）均以.tif格式公开。 **内容清单** 本提交的内容如下： - **单视场（single-tile）**：用于解答初始问题的低分辨率扫描数据。 - **双视场（two-tiles）**：用于研究塑像内部工具痕迹等精细细节的高分辨率扫描数据，包含视场1（顶部，t1）与视场2（底部，t2）两个子文件夹。每个数据文件夹包含：暗场（快门关闭）图像`di0000.tif`、采集前平场（快门开启）图像`io0000.tif`、采集后平场（快门开启）图像`io0001.tif`、原始（未处理或未校正）投影图像`scan_*.tif`、包含扫描仪元数据的文本文件`data settings XRE.txt`、可读性更强的扫描仪元数据文本文件`scan settings.txt`、扫描开始时基本几何信息的快照文本文件`data settings XRE.ini`。`script.txt`与`script_executed.txt`为记录设备执行命令列表的文本文件。 **补充链接** 本数据集由阿姆斯特丹数学与计算机科学中心（Centrum Wiskunde & Informatica, CWI）计算成像团队（CI-CWI）制作。如需FleX-ray数据集相关的Python/MATLAB脚本，请参阅本团队的GitHub页面。 **联系方式** 如需更多信息或使用该数据集的指导，请联系s.b.coban [at] cwi.nl。 **致谢** 感谢荷兰国立博物馆（Rijksmuseum）的伊莎贝尔·加拉雄（Isabelle Garachon）提供本次珍贵样本。