Hi Anastasia, Just follow up on this thread.. If 5000 samples were used for each voxel, how can I normalize the intensity of path.pd volumes to a sum of 1 ? Also what thresholding value was chosen to calculate the tract volume, shown in the pathstats.overall.txt ?
Thanks. ping On Fri, Nov 9, 2012 at 10:56 AM, Anastasia Yendiki <ayend...@nmr.mgh.harvard.edu> wrote: > > Hi Jon - The path.pd volumes are indeed the posterior probability > distributions of each pathway. They are not normalized to a sum of 1 > though b/c they're estimated by a sampling algorithm (drawing sample paths > from this unknown distribution and adding up the sample paths, instead of > estimating the distribution directly). > > Hope this helps, > a.y > > On Fri, 9 Nov 2012, Jon Clayden wrote: > >> Dear all, >> I understand that the various "path.pd" image files that are created by >> TRACULA represent a posterior >> distribution over the corresponding tract location, but I was wondering if >> someone could explain to me >> exactly what the values in these images mean. I assume that they are not >> probabilities as such, since they >> have values ranging up to several hundreds. >> >> Thanks in advance, >> Jon >> >> > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > 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. > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
