Ahh, if this is true, then there may be no inconsistency between mri_tesselate and the other routines!
Bruce Fischl wrote: > > it's not just for historical reasons. The orig surface is generated by > covering the faces of each white matter voxel (that doesn't neighbor white) > with vertices, so their natural location is between slices. > > Bruce > > On Thu, 14 Mar 2002, Doug Greve > wrote: > > > > > Hi Blaise, > > > > the problem may be that the vertex is between slices. When you use the > > goto vertex option in tkmedit, the cursor will go to the closest point > > to that vertex. If the vertex is between slices, it won't interpolate. > > The RAS reported in the control panel will then be that of the cursor. > > For historical reasons, all the orig vertices are placed between slices > > (ie, they will all have 0.5 in the x,y, and z coords). > > > > doug > > > > > > Blaise YVERT wrote: > > > > > > I am refering to the Volume RAS prompted in tkmedit. > > > Blaise. > > > > > > >How are you measuring the RAS coords? > > > > > > > >doug > > > > > > > >Blaise YVERT wrote: > > > >> > > > >> Dear All, > > > >> > > > >> First of all, I'd like to thank the whole team of Harvard NMR center > > > >> for making available freesurfer. Indeed, although this mailing list > > > >> is mostly used to report bugs and problems, please know that fs is a > > > >> great tool ! > > > >> > > > >> Now, to follow up the discussion introduced by Al Kim, it seems that > > > >> the coordinates in *.asc files are slightly shifted with respect to > > > >> the RAS coordinates, namely : > > > >> > > > >> Xras = Xasc - 0.5 > > > >> Yras = Yasc + 0.5 > > > >> Zras = Zasc - 0.5 > > > >> > > > >> Could anyone confirm this ? > > > >> > > > >> Best wishes, > > > >> Blaise. > > > >> -- > > > >> > > > >> -- > > > >> INSERM U280 > > > >> 151 Cours Albert Thomas, > > > >> F-69424 Lyon cedex 03, France. > > > >> Tel : +33 4 72 68 19 27 > > > >> Fax : +33 4 72 68 19 02 > > > >> URL : http://www.lyon151.inserm.fr/unites/280_tout.html > > > >> -- > > > > > > > >-- > > > >Douglas N. Greve, Ph.D. > > > >MGH-NMR Center > > > >[EMAIL PROTECTED] > > > >Phone Number: 617-724-2358 > > > >Fax: 617-726-7422 > > > > -- Douglas N. Greve, Ph.D. MGH-NMR Center [EMAIL PROTECTED] Phone Number: 617-724-2358 Fax: 617-726-7422
