Elektra Beckum NM20600A-A, MCE manual Creating BEM files, Min dist

Selecting the head model			MCE User’s Guide
Table 1		Properties of the point sets
	Origin: xyz		Sphere model origin (in mm; head coordinates)
	Lattice		The density of the points in the point set (in mm)
	Min dist		The minimum distance to the sphere model origin (in
			mm). Points deeper than this are excluded from the
			point set. Very deep source points may lead to numer-
			ical instability in the calculations.
	Comment		The comment seen in the list
	Points		The number of possible source points

4.3 Creating BEM files

If you have MR images of the subject, you can create fif-files describing boundary element models of the brain with MriLab and meshes2fiff programs. See the manu- als of those programs (or Source Modeling manual) for details of using those pro- grams.

When creating the meshes in Mrilab, you must save them in head coordinates in meters.

Warning: The triangle meshes used in MCE to describe the shape of the brain must be defined in head coordinates. This differs from the recommended coordi-

! nate system usage in dipole modeling program.

10 2004-05-17 NM20600A-A