Analytical noise propagation data of CNN method used in CT imaging

Covariance data analytically propagated from input to output of U-net, each file contains covariance matrix of both projection and its reconstruction.'PHA/PHB' in filename stands for phantom A or B; 'Unetcov' for analytical covariance of U-net; 'LR/SW' for LeakyReLU or Swish activation; '1e3/1e4' for the number of incident photons. These files provide figures 4-7. Note that the air region in variance map is manually zeroed for better presentation.'Practical Experiment' contains analytical covariance from the practical head experiment. This file provides figure 8.'NetRecon_phantom_fig2.mat' contains phantom information displayed in figure 2.本数据集为从U-net（U型网络）的输入到输出解析传播得到的协方差数据，每个文件均包含投影及其重建结果的协方差矩阵。文件名中的"PHA/PHB"指代体模A或体模B；"Unetcov"指代U-net的解析协方差；"LR/SW"指代LeakyReLU（泄漏ReLU）或Swish激活函数；"1e3/1e4"指代入射光子数。该数据集的文件对应图4至图7。需注意，为获得更佳展示效果，方差图中的空气区域已被手动置零。"Practical Experiment"包含实际头部实验的解析协方差数据，该文件对应图8。"NetRecon_phantom_fig2.mat"包含图2中展示的体模相关信息。