The 'SPM space' is MNI space, but you can convert the coordinates to the
ones used by Talairach and Tournoux, for example using Matt Brett's approach
http://www.mrc-cbu.cam.ac.uk/Imaging/mnispace.html
So to answer your question: the displayed coordinates are MNI space.
Also if I remember correctly there was an extensive discussion about which
coordinates to report in publications some time ago
Just do a search for MNI Talairach coordinates or the like.
Hope this helps
Claus
************
Dr. Claus Lamm
Research Associate
Social Cognitive Neuroscience
Department of Psychology
The University of Chicago
5848 S. University Avenue, Chicago, IL 60637
Phone: (773) 702-4661 Fax: (773) 702-0886
EMail: [log in to unmask]
Web: http://home.uchicago.edu/~decety/
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On
Behalf Of JULIE E MCENTEE
Sent: Friday, October 27, 2006 12:53 PM
To: [log in to unmask]
Subject: [SPM] glass brains 'volume'- Talairach or MNI coordinates?
I am trying to clarify whether the x, y, z coordinates displayed when
clicking 'volume' when the glass brains are displayed on a 'Results' page
following the definition of a contrast are Talairach or MNI. The SPM99
manual (I know its an outdated version, but I'm working on old data) states
that they are Talairach. However, can you explain the following from the
manual regarding MNI:
• The space of the template images in SPM is based upon the Talairach
system, but does
not make assumptions about brain symmetry, and includes the cerebellum.
• The stereotactic space is based on 152 brains from the Montréal
Neurological Institute,
and will eventually be replaced in due course by a 450-brain version for the
entire ICBM
consortium ().
• The 152 subject average brain was chosen rather than the MNI305 official
standard brain
because from the 152 subjects T2- and PD-weighted images were also
available, allowing
much more flexibility in the range of different MR contrasts that can be
spatially
normalized to the same stereotaxic space. See spm_templates.man for details.
• A combination of templates may be used when the image to determine
parameters from is
different (e.g., intensity with a new MRI sequence) from the templates
provided by SPM.
For other purposes, e.g. normalising PET-ligand scans, creating a
user-specified template
should be considered.
Please reply to all.
Much appreciated,
Julie E. McEntee, M.A.
Senior Research Program Coordinator
Department of Psychiatry- Neuroimaging
Johns Hopkins University School of Medicine
600 N. Wolfe St./ Phipps 316
Baltimore, MD 21287
Phone: 410-502-0468
Fax: 410-614-3676
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