Hi Bruce, They have the same geometry, but didn't have the same center (128 128 128 vs 128 118 72). I guess freeview doesn't not show this difference, or handle it in a different way than mris_calc. Nevertheless, when both volumes have the same center (mri_convert -oc 0 0 0), the mris_calc -o out.mgz binF2.mgz mul binF1.mgz gives the correct and expected result. Should have checked this earlier, but I have been lured by the overlay in freeview.
@ Rudolph : "problem" solved. I didn't express myself correctly, sorry about that. The content of binF1 and binF2 were absolutely not modified, the input volume was "shifted" (see why below) so that the resulting volume was different from what we expected when seeing the overlay in freeview. Best, Christopher On 12.10.2012 16:57, Bruce Fischl wrote: > Hi Christophe > > what does mri_info tell you about them? Are they the same geometry? > Bruce > On Fri, 12 Oct 2012, Christopher Coello wrote: > >> Dear Freesurfer community, >> >> Using freeview, I can visualize that two binary volumes are overlaying >> in some parts. >> freeview -v binF1.mgz -v binF2.mgz >> >> When using the command >> mris_calc -o out.mgz binF1.mgz mul binF2.mgz >> to create the intersection of these two volumes, I obtain a file with >> only zeros. >> To debug, I added the two volumes >> mris_calc -o out.mgz binF1.mgz add binF2.mgz >> I was surprise to see that one of the volumes (binF1) is shifted of tens >> of voxels along an axis. >> When doing >> mris_calc -o out.mgz binF2.mgz add binF1.mgz, >> the binF2 is shifted. >> >> Is that a bug ? >> >> mris_calc : v.1.37.2.4 2011/04/04 >> freeview : v1.0 2011/05/22 >> >> Best, >> >> Christopher >> >> >> >> > > > 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. > -- Christopher Coello, Ph.D. Preclinical PET/CT unit http://www.med.uio.no/imb/english/research/about/infrastructure/pet/ Institute of Basic Medical Sciences Faculty of Medicine, University of Oslo tel. +4745154516 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
