The electrodes are quite long they're length vary from 10cm up to 15cm depends on the subject. they usually have been implanted quite deep in the brain.
cheers, g. 2011/1/25 Bruce Fischl <fis...@nmr.mgh.harvard.edu> > Hi Gabriele > > inflated is definitely wrong as it has no meaning in the MRI coords. Any > idea how deep the electrodes are? The white might be best as it will > minimize the chances of erroneously assigning the electrode to the wrong > bank of a sulcus. > > > cheers > Bruce > > > On Tue, 25 Jan 2011, Gabriele Arnulfo wrote: > > Hi Bruce, >> >> I've a list of intra cerebral electrodes channel position segmented out >> from >> the MRI scans. I would like to convert the computed positions from the MRI >> scanner space to freesurfer vertexes. I've already transformed the >> coordinates of each point from indexes to Cartesian Space values (in the >> scanner RAS space). I'm looking to find which is the right surface to use >> the inflated or the pial surface to compute the nearest vertex for each >> point. >> >> Does this short description clarify a little bit more my goal? >> >> cheers, >> >> g. >> >> 2011/1/25 Bruce Fischl <fis...@nmr.mgh.harvard.edu> >> >> Hi Gabriele, >>> >>> what are you trying to accomplish? The "right choice" depends on your >>> goals. >>> >>> cheers >>> Bruce >>> >>> On Tue, 25 Jan 2011, Gabriele Arnulfo wrote: >>> >>> Hi again, >>> >>>> >>>> looking in previous emails in the list i found that the best way to find >>>> the >>>> nearest vertex number to a certain point is by using the matlab script >>>> mesh_vertex_nearest. So far I've used it with input parameters: the >>>> vertices >>>> read through read_surf(rh_pial) and a matrix of Cartesian Coordinates. >>>> In >>>> this context I'd like to know which surface is the right choice, if >>>> there >>>> should be a choice. I've inserted either the pial and inflated surface >>>> having different result (vertex index) for the same point (RAS xyz). >>>> >>>> >>>> Cheers, >>>> >>>> g. >>>> >>>> >>>> >>>> >>> The information in this e-mail is intended only for the person to whom it >>> is >>> addressed. If you believe this e-mail was sent to you in error and the >>> e-mail >>> contains patient information, please contact the Partners Compliance >>> HelpLine at >>> http://www.partners.org/complianceline . If the e-mail was sent to you >>> in >>> error >>> but does not contain patient information, please contact the sender and >>> properly >>> dispose of the e-mail. >>> >>> >>> >> >> >> -- In a world without wall, how needs WINDOWS??
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