Thanks, Bruce! -David
On Tue, Sep 10, 2013 at 5:46 AM, Bruce Fischl <fis...@nmr.mgh.harvard.edu>wrote: > Hi David > > there are situations in which mri_pretess can elimate pathological > configurations by removing/adding any one of a set of voxels. In those > cases the norm is used to decide among them (e.g. to remove the one that > appears least like WM or to add the one that appears most like WM) > > cheers > Bruce > > > > On Mon, 9 Sep 2013, David Romano wrote: > > Hi everyone, >> >> I was hoping that someone could clarify for me the role played by norm.mgz >> in the command >> >> mri_pretess filled.mgz 255 norm.mgz filled-pretess255.mgz >> >> from the -tessellate step of the -autrecon2 section on the page >> >> >> http://surfer.nmr.mgh.harvard.**edu/fswiki/ReconAllDevTable<http://surfer.nmr.mgh.harvard.edu/fswiki/ReconAllDevTable> >> . >> >> My understanding is that this command will (roughly) perform the following >> tasks for a given voxel v in filled.mgz with intensity 255: >> >> 1) Determine whether there are any other voxels of intensity 255 in the >> 3x3x3 cube centered at v. >> >> 2) If so, then further determine whether none of these share a face with >> v. >> >> 3) If so, then let S be the set of all such voxels, together with v >> itself, >> and identify an "optimal" collection of the remaining voxels in the 3x3x3 >> cube to add to S so that every voxel in S shares a a face with at least >> one >> other voxel in S, where "optimal" means that the added voxels should have >> intensities as close as possible to 255 in norm.mgz. >> >> Does this capture the role played by norm.mgz? Or am I way off? >> >> Thanks in advance for your help, >> David Romano >> >> >> >> > > 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<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. >
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