============== MGH/MIT/HMS Martinos Center ==============

=========----- buckner_public_distribution -----=========

Contained in this distribution is publicly available
MRI data for use as practice data with the Freesurfer
tutorial (available from the main Freesurfer website at
https://surfer.nmr.mgh.harvard.edu/fswiki).

The data originates from Washington University, collected
by Randy Buckner and colleagues. It consists of a group 
of 40 nondemented subjects, ranging in age from 18 to 93
(with no subjects between 30 to 65 years of age), 
21 women and 19 men. These data are a subset of a larger 
open-access structural data set that can be obtained 
from the fMRIDC at: http://www.fmridc.org/f/fmridc,
accession number 2-2004-1168X.

Within the main directory of this distribution are three
subdirectories: 'group_study', 'tutorial_subjs', and 'raw'.

The directory 'group_study' has the 40 subjects, 
numbered '004', '008' ... '149', plus the MNI305 data
set. Within each subject directory is the standard 
Freesurfer directory layout (created via the mksubjdirs 
utility), with the reconstructed and surface data present 
(ie, already processed by Freesurfer). The 'stats' 
directory contains the GLM scripts and outputs.  The 
'average' directory is the result of averaging these 40 
subjects using the script 'make_average_surfaces'. The
'fsaverage' directory is derived from the MNI305 data
set (see the README file in that directory).

The directory 'tutorial_subjs' includes troubleshooting 
examples of Freesurfer's recon-all process, and is intended
for usage with the on-line tutorial.

The 'raw' directory contains the original subject files
in Analyze Image (7.5) format (.hdr and .img).

For each subject, four MPRAGE-protocol sessions were
conducted.  The images were originally collected on a
Siemens Vision scanner running Numaris v3.5 (prior to
the year 2000). This version of software does not store
enough information in the image files to unambiguously
determine the timing parameters. Also, at that time,
Siemens defined TR differently for MPRAGE: then it was
the time between RF excitations (the small flip angle
excitations), not the time between inversions as it is
currently defined. The TR of 9.7 ms (and TE = 4 ms) is
correct by that (older) definition. Bandwidth was 195
Hz/pixel. Flip angle was 10 degrees.

Here is some information on the 'group_study' subjects:

subjid gender age
------ ------ ---
 004   Male    72
 008   Female  88
 017   Male    25
 021   Male    22
 032   Male    79
 039   Female  69
 040   Female  24
 045   Female  78
 049   Male    19
 067   Male    71
 073   Male    77
 074   Male    85
 080   Male    23
 084   Male    21
 091   Female  23
 092   Male    29
 093   Female  22
 095   Female  70
 097   Male    74
 099   Female  93
 102   Female  82
 103   Female  66
 106   Male    27
 108   Male    28
 111   Female  81
 114   Female  87
 123   Female  69
 124   Female  30
 128   Male    90
 129   Female  65
 130   Male    68
 131   Female  80
 133   Female  73
 136   Female  78
 138   Female  26
 140   Female  18
 141   Female  20
 144   Male    78
 145   Male    80
 149   Male    77

Direct questions or comments to:
freesurfer at nmr dot mgh dot harvard dot edu

(Edit date: 10 Jan 2007)