Micro-CT tomographic data set of 38 mummy labels from the BNU in Strasbourg (1/2)

Summary This submission contains a tomographic dataset of 38 mummy labels from the BNU in Strasbourg used to perceive the anatomical identification possibilities of the woods used for mummy labels and to carry out ring width measurements. The data will be made available as part of [Blondel et al., 2024]. Apparatus The dataset is acquired using the EasyTom 150/160 X-ray tomograph (RX Solutions). This tomograph is equipped with a sealed X-ray generator with a compact tube and an interchangeable-plane sensor fitted with a CsI scintillator. The CT scanner parameters for the session carried out on the mummy labels were set at 90 Kv with an intensity of 195 mA for an acquisition resolution varying between 11 and 42 µm with 2016 projections (that is about 20 images on average per projection) with a frame rate of 12,5 and a temperature of 28°C. Each image was then reconstructed by filtered retroprojection using the XAct software (RX Solutions). Information on placing mummy labels in the tomograph The installation of the mummy labels was the same for all the different labels, some of which varied in size. They were attached to a plastic clamping vice-type support covered in expanded foam to prevent the labels from being marked during clamping, before being placed on the tomograph's rotating platform. Issues relating to the data collected The data collected for this study were carried out to perceive the possibilities of anatomical identification from tomographic images in the transverse plane. The tangential and radial planes were not of sufficiently high resolution due to the dimensions of the mummy labels, see details in [Blondel et al., 2024]. The other objective was to use tomographic imagery to facilitate the acquisition of ring widths in the transverse plane of mummy labels. The mummy labels were not tomographed in their entirety. Only the central part, a few centimetres high, was tomographed to maximise resolution. The number of projections and the resolution per label are specified in table form in [Blondel et al., 2024], as they vary according to the width and thickness of the mummy labels. All raw tomography image data (i.e. without corrections) are available in .tif format. The post-processing steps are described in the methodology of [Blondel et al., 2024]. List of Contents The content of the submission is divided into 38 data sets corresponding to the 38 mummy labels. Each set is labelled with the inventory number of the BNU mummy label and its resolution. Each set contains:- All the images of the transverse plane in .tif format, the number of projections of which varies from one label to another depending on the resolution of the acquisitions, see details in [Blondel et al., 2024].- The .xls file containing a summary of the scanner metadata for each of the mummy labels.- The three images processed in the transverse plane for each label, including those used to measure ring width for the 7 labels for which ring width measurement was possible, as presented in [Blondel et al., 2024].- Colour photographs of the front and back of each tomographed mummy label including those on which ring width measurements were taken on their surface, unless otherwise stated[1]. All these photographs are marked: Coll._et_photogr._BNU_Strasbourg_OpenLicence, accompanied by the inventory number. Acknowledgments We would also like to thank engineers Damien Favier and Antoine Egele from the Charles Sadron Institute for their work on the tomographic acquisitions carried out on the 38 mummy labels. [1] The photographs of the front and back of mummy label HO255 are not available, as they are currently being studied.摘要 本提交数据集包含斯特拉斯堡BNU馆藏的38件木乃伊木标签断层扫描（tomographic）数据集，旨在探究用于制作木乃伊标签的木材的解剖学鉴定可行性，并开展年轮宽度测量工作。本数据集将作为[Blondel等人，2024]研究的一部分公开。 扫描设备 本数据集采用EasyTom 150/160 X射线断层扫描仪（X-ray tomograph，RX Solutions）采集。该扫描仪配备密封式X射线发生器（搭载紧凑型X射线管）与可更换平面探测器（搭载碘化铯（CsI）闪烁体）。本次木乃伊标签扫描所用的CT参数设置为：管电压90千伏，管电流195毫安，采集分辨率介于11~42微米，扫描投影数为2016个（平均每个投影约对应20幅图像），帧率12.5，扫描环境温度28摄氏度。所有图像均通过XAct软件（RX Solutions）采用滤波反投影（filtered retroprojection）法重建。 木乃伊标签在断层扫描仪内的安装规范 尽管部分木乃伊标签尺寸存在差异，所有标签的扫描固定方式均保持一致。标签先被固定于包裹了发泡海绵的塑料台钳式支架上，以避免夹持过程中对标签造成损伤，随后再放置于断层扫描仪的旋转载物台上。 采集数据相关说明 本研究采集的断层扫描数据，旨在探究通过横断面断层图像开展木材解剖学鉴定的可行性。受木乃伊标签尺寸限制，其切向面与径向面的扫描分辨率未达预期，详细信息参见[Blondel等人，2024]。本研究另一目标为借助断层扫描图像，便于获取木乃伊标签横断面的年轮宽度数据。本次扫描未覆盖完整的木乃伊标签，仅对其中心高度约数厘米的区域进行扫描以最大化分辨率。每个标签的投影数与分辨率随其宽度、厚度变化而不同，具体信息以表格形式呈现于[Blondel等人，2024]。所有原始断层图像数据（即未经校正的数据）均以.tif格式存储。后处理步骤详见[Blondel等人，2024]的研究方法部分。 数据集内容清单 本提交内容包含38个数据集，分别对应38件木乃伊标签。每个数据集以BNU馆藏木乃伊标签的馆藏编号及其扫描分辨率命名。每个数据集包含以下内容： - 所有横断面断层图像，格式为.tif，投影数随标签不同而变化，取决于采集分辨率，详细信息参见[Blondel等人，2024]。 - 包含每件木乃伊标签扫描仪元数据（metadata）摘要的.xls文件。 - 每件标签的3幅横断面处理图像，其中包含[Blondel等人，2024]中提及的7件可开展年轮宽度测量标签所用的测量图像。 - 每件扫描标签的正面与背面彩色照片，包括表面已开展年轮宽度测量的标签照片，除非另有说明[1]。所有照片均标注有"Coll._et_photogr._BNU_Strasbourg_OpenLicence"字样，并附带馆藏编号。 致谢 我们还要感谢夏尔·萨德隆研究所（Charles Sadron Institute）的工程师达米安·法维耶（Damien Favier）与安托万·埃格勒（Antoine Egele），感谢他们为38件木乃伊标签的断层扫描采集工作提供的技术支持。 [1] 木乃伊标签HO255的正反面照片暂未公开，因其目前仍处于研究阶段。