= Volume source estimation =
The head models computed with Brainstorm were until now limited to the  cortex surface. This choice was following the assumption that most of  the magnetic and electric activity that we record outside of the head  comes from the cortex. It is a serious limitiation for users who want  to study some deeper regions and use their own source spaces. To extend  the range of analysis possible with Brainstorm, we have added the  possibility to construct dipole grids that sample the full brain volume,  and the appropriate visualization tools.

== Compute a volume head model ==
 1. Select the protocol TutorialCtf. Go to the view "Functional data (sorted by subjects)"
 1. Right-click on Subject01 / Right > Compute head model. Select the source space to '''MRI volume'''. Select ''Overlapping spheres'' method. Click on Run.<<BR>><<BR>> {{attachment:headmodeler.gif}} {{attachment:gridOptions.gif}}