Jidan, That is way too hard of a question on the Monday morning following a long weekend. ;-)
See inline replies below. Donna On 12/28/2009 02:55 AM, z丹丹 wrote: > Hi Donna, > > I want to ask a question related to the spherical registration. When > we have the original surface, we need to make it into a sphere to > register it to a template sphere. After this step, we will get the > deformed sphere. Do you have any way to make this deformed sphere go > back into the original surface space? If you selected a bidirectional deformation (source to target AND target to source), then you could apply the inverse deformation to the deformed sphere, but in practice no one ever does this, as far as I know. The typical reason for deforming in the reverse direction (target to source) is viewing atlas "goodies" on the individual's surface (e.g., visuotopic or orbito-frontal parcellations). > I mean, after this, I can have one original surface, one deformed > original surface which is from the deformed shpere, when I superimpose > them together, we can know which part deformed a lot. I think viewing the deformation field is probably a better way to do this. See figure 5 in David Van Essen's PALS paper (http://brainvis.wustl.edu/resources/-Pals.wcover.pdf), panel C. This isn't something I do every day, but I think you use File: Open Data File to open the deform_field file that gets written during registration. Then look at Toolbar: D/C: Deformation Field to see your visualization options. > Is that possible? Or do you just compare the deformation in the > spherical space? To be honest, I generally don't look at these deformations. I do sanity check the registration output, to make sure the deformed fiducials look reasonable and the depth maps are sane looking. Then I do group analyses, where depth or coordinate differences are computed and put through statistical tests. > > Thanks a lot. > > Jidan > > ------------------------------------------------------------------------ > 使用Messenger保护盾2.0，支持多账号登录！ 现在就下载！ > <http://im.live.cn/safe/> > ------------------------------------------------------------------------ > > _______________________________________________ > caret-users mailing list > [email protected] > http://brainvis.wustl.edu/mailman/listinfo/caret-users > _______________________________________________ caret-users mailing list [email protected] http://brainvis.wustl.edu/mailman/listinfo/caret-users
