The averaged brain atlas image file.

Version 2.1 Updates:

4-week atlas

• A threshold of 200 was applied to remove excess matter.

12-week atlas

• A threshold of 600 was applied to remove excess matter.
• Cropped & centered.

Version 1.2:

• File referred to as Piglet_Averaged_Brain.nii.
  

This folder contains binary image files of twenty-six to thirty ROI provided at three different thresholds, 0% [ROI_thr0], 25% [ROI_thr25], and 50% [ROI_thr50].

Version 2.1 Updates:

Both 4-week & 12-week ages

• Now contains 30 ROI, including the following additional regions: Nucleus Accumbens, Putamen, Substantia Nigra, & Third Ventricle.
• Corrected discrepancies (i.e. inconsistent values across thresholds & orientation issues) across the 3 different thresholds. 

12-week age

• All ROIs were cropped & centered.

Version 1.2:

• Folder referred to as ROI_Labels folder.
  

This folder contains images that have all the regions of interest (at the three different thresholds: 0%, 25%, & 50%) compiled. The label number for each ROI can be found in the accompanying “ROI_Labels” file.

Version 2.1 Updates:

Both 4-week & 12-week ages

• Corrected discrepancies (i.e. inconsistent values across thresholds & orientation issues) across the 3 different thresholds.
• New priority list for labels created.
• A maximum likelihood approach was utilized, meaning that certain regions of lower priority are not displayed or have very few voxels in the combined maps. 
  • A full breakdown comparing number of voxels and volume of each separate ROI binary map and combined threshold map is provided in the included Excel workbook: Pig_MRI_Atlas_V2.1_ROI_and_Combined_Voxel_Volume_Comparison
    

This folder contains the tissue probability maps for segmenting the brain into gray matter, white matter, cerebrospinal fluid, and not brain.

Version 2.1 Updates:

Both 4-week & 12-week atlases

• An inconsistency in threshold labeling of the Not_Brain map was addressed. This map is now fully binary.

Version 1.2:

• Raw_Tissue_Segmentation folder does not include a NotBrain map.
• Smoothed_Tissue_Segmentation folder contains tissue probability maps that have been smoothed with a full-width at half maximum (FWHM of 1x1x1 mm).
  

This is a standard fractional anisotropy template to be used for Tract-Based Spatial Statistics (TBSS).