Computed tomography analysis of multicorer SO268/1_50-2, core 16@en

Selected multicorer cores of R/V Sonne cruise SO268-1 and were scanned by a Toshiba Aquilion 64 computer tomograph (CT) at the hospital Klinikum Bremen-Mitte with an x-ray source voltage of 120 kV and a current of 600 mA. The CT image stacks have a resolution of 0.35 mm in x/y-direction and 0.5 mm resolution in z-direction (0.3 mm reconstruction unit). Images were reconstructed using Toshiba's patented helical cone beam reconstruction technique (TCOT) and are provided in DICOM-format. The data were processed with the ZIB edition of the Amira software (version 2021.03; Stalling et al., 2005; http://amira.zib.de). Within Amira, the core liners, including about 2 mm of the core rims, were deleted from the data set. Mangan nodules with diameters >1 mm, open bioturbation traces, an unidentified organism (only present in core SO268-2-200-1 MC18), the natural bioturbated and surficial homogenised sediment were segmented by a marker-based watershed segmentation and visualized in 3D. Subsequently, the sediment components were quantified (MaterialStatistics module; volume per slice) and the mean and standard deviation of the sediment x-ray attenuation (MaterialStatistics module; statistics per slice per label; to avoid marginal averaging effects the sediment label was reduced by three voxels) were determined.选取了‘索恩号’（R/V Sonne）科考航次SO268-1的多管岩心，于不来梅米特临床医院（Klinikum Bremen-Mitte）使用东芝Aquilion 64型计算机断层扫描仪（CT）进行扫描，扫描时X射线源电压设置为120 kV、管电流为600 mA。CT图像栈在x/y方向的分辨率为0.35 mm，z方向分辨率为0.5 mm（重建单元为0.3 mm）。本数据集采用东芝专利的螺旋锥束重建技术（TCOT）完成图像重建，以DICOM格式存储。数据处理使用ZIB版Amira软件（2021.03版本；Stalling等，2005；http://amira.zib.de）完成。在Amira软件中，我们移除了数据集中的岩心套管及其周边约2 mm的岩心边缘区域。通过基于标记符的分水岭分割算法，对直径大于约1 mm的锰结核、开放型生物扰动痕迹、仅在岩心SO268-2-200-1 MC18中出现的未鉴定生物，以及天然生物扰动沉积物和表层均质化沉积物进行分割并完成三维可视化。随后，利用MaterialStatistics模块对沉积物组分进行定量分析（统计每切片体积），同时计算沉积物X射线衰减值的均值与标准差（MaterialStatistics模块；按标签逐切片统计；为避免边缘平均效应，将沉积物标签向内收缩3个体素）。