Computed tomography analysis of multicorer SO268/1_6-1, 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。该CT图像栈的x/y方向分辨率为0.35 mm，z方向分辨率为0.5 mm（重建单元为0.3 mm）。图像采用东芝专利螺旋锥束重建技术（TCOT）进行重建，并以DICOM格式存储。本数据集采用ZIB版Amira软件（2021.03版本；Stalling等，2005；http://amira.zib.de）进行预处理。在Amira软件中，我们从数据集中移除了岩心套管及其约2 mm厚的岩心边缘区域。直径大于约1 mm的锰结核、开放型生物扰动痕迹、一种仅存在于岩心SO268-2-200-1 MC18中的未鉴定生物体，以及天然生物扰动和表层均质化沉积物，均通过基于标记符的分水岭分割算法进行分割，并完成三维可视化。随后，通过MaterialStatistics模块量化沉积物组分（计算每切片体积），并测定沉积物X射线衰减值的均值与标准差（该模块按标签逐切片统计；为避免边缘平均效应，沉积物标签边界向内缩减3个体素）。