Alex,
When mapping foci using the Map Stereotaxic Focus Dialog, the focus
entered is projected using the fiducial surface displayed in the main
window. So, the main window surface must be in the same stereotaxic
space as the focus that is being mapped. The stereotaxic space entry
on the Map Stereotaxic Focus dialog is a meta-data entry for now.
Map foci as follows:
1) As needed, change the fiducial surface in the main window so that
it is in the appropriate stereotaxic space for the focus currently
being mapped. It is okay to load multiple fiducial surfaces in Caret.
2) Save the foci projection file.
3) Exit Caret.
4) Start Caret.
5) Reopen the spec file and choose the foci projection file just
saved and choose only one of the fiducial surfaces.
Since the foci projection file stores the foci relative to a triangle
in the surface, the foci will be approximately transformed from the
other stereotaxic spaces.
Good Luck.
----------------------------------------------------------
John Harwell
[EMAIL PROTECTED]
314-362-3467
Department of Anatomy and Neurobiology
Washington University School of Medicine
660 S. Euclid Ave. Box 8108
St. Louis, MO 63110 USA
On May 22, 2006, at 12:36 AM, Fornito, Alexander wrote:
Hi,
I'd like to map some foci from past studies onto the Colin surface.
I've noticed that there seems to be 2 options for selecting co-
ordinate type during this process;
1 - when loading the Colin spec file, there is the option of
choosing the SPM99, SPM2, etc fidcucial surface.
2 - in the 'studies' tab of the 'map stereotaxic focus' dialog, it
is possible to choose the stereotaxic space used in the study.
Just want to check that I've got this right:
If I chose the Colin fiducial to be SPM2, then that means the
surface has been registered to SPM2 template space. If I want to
map the focus of a study that used SPM99 space, will choosing
SPM99 in the 'map stereotaxic focus' dialog automatically convert
the coords so the focus appears in the (roughly) correct spot on
the SPM2-space surface?
If so,if a study has reported coords that have been transformed
from MNI to talairach (e.g., using Matthew Brett's method), would
choosing 'AFNI' in the 'map stereotaxic focus' dialog be the most
appropriate?
Finally, there are some studies that used SPM96. Does anyone know
if there are large differences between SPM96 and SPM99 spaces, or
indeed, between SPM99 and SPM2 spaces?
Thanks for your help,
Alex
Alex Fornito
M.Psych/PhD (clin. neuro.) candidate
Melbourne Neuropsychiatry Centre and Department of Psychology
National Neuroscience Facility
The University of Melbourne
Levels 2 & 3, Alan Gilbert Building
161 Barry St
Carlton South Vic 3053 Australia
Ph: +61 3 8344 1624
Fax: +61 3 9348 0469
email: [EMAIL PROTECTED]
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