This is a version of the ICBM Average Brain - an average of 152
T1-weighted MRI scans, linearly and non-linearly (6 iterations)
transformed to form a symmetric model in Talairach space - that
is specially adapted for use with the MNI Linear Registration
Package (mni_autoreg).
Please note that this volume here is different from the mni305 model
(average_305) that was originally (back in ancient times) included
with mni_autoreg.
Included in this package are the following files:
``icbm_avg_152_t1_tal_nlin_symmetric_VI.mnc``
a version of the average MRI that covers the whole brain
(unlike the original Talairach atlas), sampled with 1mm cubic
voxels
``icbm_avg_152_t1_tal_nlin_symmetric_VI_mask.mnc``
a mask of the average brain in icbm_avg_152_t1_tal_nlin_symmetric_VI.mnc,
semi-automatically created by Dr. Louis Collins. Note that
this mask has had holes filled in, so it is a connected volume
but includes non-brain tissue (eg. the CSF in the ventricles)
``icbm_avg_152_t1_tal_nlin_symmetric_VI_headmask.mnc``
another mask (full head mask), required for nonlinear mode
``icbm_avg_152_t1_tal_nlin_symmetric_VI_eye_mask.mnc``
a mask of the eyes
Reference: G. Grabner, A. L. Janke, M. M. Budge, D. Smith, J. Pruessner, and D. L. Collins, "Symmetric atlasing and model based segmentation: an application to the hippocampus in older adults", Med Image Comput Comput Assist Interv Int Conf Med Image Comput Comput Assist Interv, vol. 9, pp. 58-66, 2006.