[Eeglablist] Subjects head size
roberto at smi.auc.dk
Wed Mar 10 00:50:23 PST 2004
Most important is to get the ratios between skin, skull, csf and brain
correct. The real size of the head with which you could multiply these
ratio's only ends up as scaling factor in the dipole position.
Internally the forward computation uses dimensionless values, and works
with relative dipole excentricity.
If you want to map a dipole position onto an MRI, you should get the
dimensions as accurate as possible. The default dimensions of the
spheres in DIPFIT are the same as in BESA. They are not neccesary
optimal for your individuals MRI, or even for the cannonical MRI that
is included in EEGLAB.
On 9 Mar 2004, at 18:26, Birju Patel wrote:
> I'm trying to figure out the what value should be input for the shell
> (skin) in the pop_dipfit_settings(). What is the best measurement to
> of a subject's head size for use in a spherical head model?
> Birju Patel
> Eeglablist mailing list Eeglablist at sccn.ucsd.edu
> Eeglablist page: http://www.sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to eeglablist-unsub at sccn.ucsd.edu
> To switch to digest mode, send an empty email to
> eeglablist-digest at sccn.ucsd.edu
Center for Sensory-Motor Interaction (SMI)
Aalborg University, Denmark
F.C. Donders Centre for Cognitive Neuroimaging
P.O. Box 9101
NL-6500 AH Nijmegen
Tel: +31 (0)24 3619695
Fax: +31 (0)24 3610989
More information about the Eeglablist