Hyperspectral X-ray CT datasets of three chemical phantoms

<strong>General Data description:</strong> The following are hyperspectral (energy-resolved) X-ray CT datasets for a set of chemical phantom samples, each containing multiple phases of an aqueous contrast agent at different concentrations. All scans were acquired with an energy-sensitive HEXITEC detector in the Henry Moseley X-ray Imaging Facility at The University of Manchester. The following data contains all the files necessary for reconstruction of each dataset. The phantom samples were produced as they each offer a distinct spectral marker which, when measured by an energy-sensitive detector, may be used as a form of calibration for spectral analysis. The phantoms were for the common contrast agents of I₂KI, BaSO₄ and PTA. <strong>File descriptions:</strong> Contained are four MATLAB (.mat) data files, as well as three text (.txt) metadata files. Iodine_Phantom_scan_parameters.txt provides the full sample and detector geometry of the scan acquisition for the I₂KI phantom. The concentrations for the iodine phases were 25, 50, 76 and 101 mg/ml of aqueous I₃^- ions respectively. Barium_Phantom_scan_parameters.txt provides the full sample and detector geometry of the scan acquisition for the BaSO₄ phantom. The concentrations for the BaSO₄ phases were 100, 200 and 400 mg/ml of BaSO₄ respectively. Tungsten_Phantom_scan_parameters.txt provides the full sample and detector geometry of the scan acquisition for the PTA phantom. The concentrations for the PTA phases were 50, 100 and 200 mg/ml of PTA respectively. Iodine_phantom_sinogram.mat contains the full 4D sinogram constructed following flatfield normalisation of the raw projection data for the I₂KI phantom. The 4D array contains the total number of energy channels acquired during scanning, followed by vertical and horizontal pixel number, and finally total projections angles acquired. In addition, a ring artefact reduction filter was applied, as well as a centre-of-rotation correction. Barium_phantom_sinogram.mat contains the full 4D sinogram constructed following flatfield normalisation of the raw projection data for the BaSO₄ phantom. The 4D array contains the total number of energy channels acquired during scanning, followed by vertical and horizontal pixel number, and finally total projections angles acquired. In addition, a ring artefact reduction filter was applied, as well as a centre-of-rotation correction. Tungsten_phantom_sinogram.mat contains the full 4D sinogram constructed following flatfield normalisation of the raw projection data for the PTA phantom. The 4D array contains the total number of energy channels acquired during scanning, followed by vertical and horizontal pixel number, and finally total projections angles acquired. In addition, a ring artefact reduction filter was applied, as well as a centre-of-rotation correction. Energy_axis.mat provides a direct conversion between the energy channels, and the energies (in keV) that they correspond to, following a calibration procedure prior to scanning.通用数据说明：下述数据集为一组针对化学体模样品的高光谱（能量分辨）X射线计算机断层扫描数据集，每套体模均包含多种不同浓度的水基造影剂相。所有扫描均由曼彻斯特大学亨利·莫塞利X射线成像实验室的能量分辨型HEXITEC探测器采集完成。本数据集包含重建各套扫描数据所需的全部文件。该体模样品各自带有独特的光谱特征标记，通过能量分辨型探测器采集后，可作为光谱分析的校准基准。本次实验所用的常见造影剂包括碘化钾（I₂KI）、硫酸钡（BaSO₄）及磷钨酸（PTA）。 文件说明：本数据集包含4个MATLAB（.mat）数据文件，以及3个文本（.txt）元数据文件。 Iodine_Phantom_scan_parameters.txt记录了碘化钾体模扫描采集时的完整样品与探测器几何结构，其中碘化钾相的浓度分别为25、50、76及101 mg/ml的水合三碘（I₃⁻）离子。 Barium_Phantom_scan_parameters.txt记录了硫酸钡体模扫描采集时的完整样品与探测器几何结构，其中硫酸钡相的浓度分别为100、200及400 mg/ml的硫酸钡（BaSO₄）。 Tungsten_Phantom_scan_parameters.txt记录了PTA体模扫描采集时的完整样品与探测器几何结构，其中PTA相的浓度分别为50、100及200 mg/ml的PTA。 Iodine_phantom_sinogram.mat包含针对碘化钾体模的原始投影数据完成平场归一化后构建的完整四维正弦图。该四维数组的维度依次为扫描过程中采集的总能量通道数、垂直像素数、水平像素数，以及总投影角度数。此外，处理过程中已应用环状伪影抑制滤波器及旋转中心校正。 Barium_phantom_sinogram.mat包含针对硫酸钡体模的原始投影数据完成平场归一化后构建的完整四维正弦图。该四维数组的维度依次为扫描过程中采集的总能量通道数、垂直像素数、水平像素数，以及总投影角度数。此外，处理过程中已应用环状伪影抑制滤波器及旋转中心校正。 Tungsten_phantom_sinogram.mat包含针对PTA体模的原始投影数据完成平场归一化后构建的完整四维正弦图。该四维数组的维度依次为扫描过程中采集的总能量通道数、垂直像素数、水平像素数，以及总投影角度数。此外，处理过程中已应用环状伪影抑制滤波器及旋转中心校正。 Energy_axis.mat提供了扫描前校准流程完成后，各能量通道与其对应能量（单位：keV）之间的直接转换关系。