High-Resolution Cone-Beam Scan Of An Apple And Pebbles With Two Dosage Levels

We release two tomographic scans with two levels of radiation dosage of two measured objects for noise-level comparative studies in data analysis, reconstruction or segmentation methods. The objects are referred to as apple and pebbles (more specific, hydrograins), respectively. The dataset collected with higher dosage is referred to as the "<em><strong>good</strong></em>" <strong>dataset</strong>; and the other as the "<em><strong>noisy</strong></em>" <strong>dataset</strong>, as a way to distinguish between the two dosage levels. The dataset are acquired using the custom built and highly flexible CT scanner, FlexRay Lab, developed by XRE NV and located at CWI. This apparatus consists of a cone-beam microfocus X-ray point source that projects polychromatic X-rays onto a 1943-by-1535 pixels, 14-bit, flat detector panel. Both dataset were collected over a 360 degrees in circular and continuous motion with 2001 projections distributed evenly over the full circle for the good dataset and 501 projections distributed evenly over the full circle for the noisy dataset. The uploaded dataset are not binned or normalized; a single dark and two (pre- and post-) flat fields are included for each scan. Projections for both sets were collected with 100 ms exposure time with the good data projections averaged over 5 takes, and no averaging was made for the noisy data. The tube settings for the good and noisy dataset were 70kV, 45W and 70kV, 20W, respectively. The total scanning time were 20 minutes for the good; 3 minutes for the noisy scan. Each dataset is packaged with the full list of data and scan settings files (in .txt format). These files contain the tube settings, scan geometry and full list of motor settings. These dataset are produced by the Computational Imaging members at Centrum Wiskunde &amp; Informatica (CI-CWI). For any useful Python/MATLAB scripts for FlexRay dataset, we refer the reader to our group's GitHub page. For more information or guidance in using these dataset, please get in touch with s.b.coban [at] cwi.nl or m.j.lagerwerf [at] cwi.nl我们发布了针对两个被测对象的两组断层扫描（tomographic scan）数据，涵盖两种辐射剂量水平，用于数据分析、图像重建或分割方法中的噪声水平对比研究。两个被测对象分别为苹果与卵石（更具体的表述为水凝颗粒）。其中采用较高辐射剂量采集的数据集被标记为「优质」数据集，另一组则被标记为「噪声」数据集，以此区分两种辐射剂量水平。 本数据集由XRE NV开发、坐落于荷兰数学与计算机科学研究中心（CWI）的定制化高灵活度CT扫描仪FlexRay Lab采集。该设备包含一个锥束微焦点X射线点光源，可将多色X射线投射至1943×1535像素、14位的平板探测器面板上。 两组数据集均在360°圆周连续扫描模式下采集：优质数据集的投影图像共2001幅，均匀分布于整个圆周；噪声数据集的投影图像共501幅，同样均匀分布于整个圆周。本次上传的数据集未经过分箱（binned）或归一化（normalized）处理；每次扫描均附带一张暗场图像与两张平场图像（预平场与后平场）。两组数据集的投影图像均采用100ms曝光时间采集：优质数据的投影图像经过5次拍摄取平均，而噪声数据的投影图像未进行平均处理。优质与噪声数据集的X射线管参数分别为70kV、45W与70kV、20W。优质扫描的总时长为20分钟，噪声扫描的总时长则为3分钟。每个数据集均附带完整的数据与扫描配置文件列表（格式为.txt），这些文件包含X射线管参数、扫描几何参数以及全部电机配置信息。 本数据集由荷兰数学与计算机科学研究中心（Centrum Wiskunde & Informatica，CI-CWI）的计算成像团队制作。若需适用于FlexRay数据集的实用Python/MATLAB脚本，请参考我们团队的GitHub页面。 如需更多使用本数据集的相关信息或指导，请联系： s.b.coban [at] cwi.nl 或 m.j.lagerwerf [at] cwi.nl