Cerebral perfusion images (smoothed, normalized average and difference images, also mean-centered baseline perfusion images).

<b>demeaned_swecqCBF_43_base_part1.nii.gz:</b> Smoothed, normalized CBF image at Y0, which has been mean-centred (the mean at each voxel across the sample is 0). As file size was limited, this is the first part, representing the first 21 subjects. Order is indicated by the ASL_order_avg.part1 column. <b>demeaned_swecqCBF_43_base_part2.nii.gz:</b> As above, but for the 22 remaining subjects. Order is indicated by the ASL_order_avg.part2 column. <b>savg_wecqCBF_43_part1.nii.gz:</b> Smoothed, normalized average CBF images for each participant (average of Y0 and Y1). Again for file size restriction, this file holds data for the first 21 participants. Order is indicated by the ASL_order_avg.part1 column. <b>savg_wecqCBF_43_part2.nii.gz:</b> As above, but for the 22 remaining subjects. Order is indicated by the ASL_order_avg.part1 column. <b>sdiff_wecqCBF_43.nii.gz:</b> Difference in smoothed, normalized CBF between the two timepoints (diff=Y0-Y1). Order is indicated by the ASL_order.diff column. <br>

<b>demeaned_swecqCBF_43_base_part1.nii.gz:</b> 该文件为Y0时刻经平滑处理、标准化后的脑血流量（Cerebral Blood Flow, CBF）图像，已完成均值中心化操作（样本中每个体素的均值为0）。受限于文件存储大小，此为第一部分，涵盖前21名受试者的数据，数据排列顺序由`ASL_order_avg.part1`列标注。<br><b>demeaned_swecqCBF_43_base_part2.nii.gz:</b> 与上述一致，但对应剩余22名受试者的数据，数据排列顺序由`ASL_order_avg.part2`列标注。<br><b>savg_wecqCBF_43_part1.nii.gz:</b> 该文件为每位受试者的平滑处理、标准化后的平均脑血流量图像（Y0与Y1的均值）。同样因文件大小限制，此文件包含前21名受试者的数据，数据排列顺序由`ASL_order_avg.part1`列标注。<br><b>savg_wecqCBF_43_part2.nii.gz:</b> 与上述一致，但对应剩余22名受试者的数据，数据排列顺序由`ASL_order_avg.part1`列标注。<br><b>sdiff_wecqCBF_43.nii.gz:</b> 该文件为两个时间点间经平滑处理、标准化后的脑血流量差值图像（差值=Y0-Y1），数据排列顺序由`ASL_order.diff`列标注。<br>