External Email - Use Caution That's right! tau PET images has z voxel dimension that is the double of amy PET voxel.
Thank you so much! Il giorno lun 27 mar 2023 alle ore 15:49 Douglas N. Greve < dgr...@mgh.harvard.edu> ha scritto: > Do the two inputs have different voxel sizes? The gtm.stats.dat file > reports the number of voxels so if the volumes have different voxels sizes, > you will get different values out. If this is not the source of the > problem, please send the gtm.stats files. > > On 3/15/2023 4:06 AM, Federica Di Antonio wrote: > > External Email - Use Caution > of course: I run the same line of command for both amyloid and tau pet > images with a fwhm = 1 in order to see what have happened > > mri_gtmpvc --i taupet.nii --reg tau.reg.lta --psf 1 --seg gtmseg.mgz > --auto-mask 1 .01 --mgx .01 --no-rescale --o tau.output > > mri_gtmpvc --i amypet.nii --reg amy.reg.lta --psf 1 --seg gtmseg.mgz > --auto-mask 1 .01 --mgx .01 --no-rescale --o amy.output > > when I extract gtm.stats.dat file and I compare the number of voxels for > the same regions (and for the same subject of course) I obtain these values > (attached files). Can I suppose this effect descends from the flag > --automask? maybe the different automatic masks lead to different pixel > size.. I don't know, I would be very grateful for any information. > Thanks for all the help you can give me about; sincere greetings from > > Federica Di Antonio > > Il giorno lun 6 mar 2023 alle ore 16:31 Douglas N. Greve < > dgr...@mgh.harvard.edu> ha scritto: > >> can you send an example? >> >> On 2/17/2023 9:38 AM, Federica Di Antonio wrote: >> >> External Email - Use Caution >> Dear experts, >> >> I hope this email finds you well. >> I run the pvc correction with mri_gtmpvc for subjects data obtained with >> two different PET tracers. >> In gtm.stats.dat, for every subject and every region, the number of >> voxels evaluated for amyloid tracer is approximately twice the volume >> evaluated for the second tracer. >> I'd expect that the volume of a region for the same subject doesn't >> change with the tracer. >> >> Do you think this error can result from previous errors in the analysis? >> Or is it in some way plausible? >> >> Thank you for your patience, >> Federica >> >> >> _______________________________________________ >> Freesurfer mailing listfreesur...@nmr.mgh.harvard.edu*MailScanner has >> detected a possible fraud attempt from "secure-web.cisco.com" claiming to >> be* >> https://secure-web.cisco.com/1qjSUA20UaLIh48sCqDL8IPFCPaVkwkYw1aWYFTFe37DxiJErf2pXmBqrJPQWzk4ZH3C9SnSkDOPPaSZBtVpGrd6SlBiP_xnSQhDWu1CIoP8Hnn9-Ufkkc_Pphun4UvyqXDWhy1GAYmm7P0GwjmAkI1Edkfn7r-h1RAQg9bKg7xb9WgfgnkqqqUlOeM3ipV6SV2yQClIuJIXpX18gzjURQBCVaJ5u19Llz8VRkN9VHPPipEVINzAxGssHA-96T9xRi8o0tCTCRJ75YFpdNm7ITra9A6he1jhQughe2SYYZeYhAHRlwOTd3A6Sg2qMhNRffztikFU1guoliaaBlbXZEg/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer >> >> <https://secure-web.cisco.com/1VM0gR7PtCdMPFYb3L3zfpgwLUWOX8ubtu2o8dbtq5I-tn9z-7soFv7DH5K8EI2bXLuPaSVv-pYMQyZnsgcedSe6v2dFI-gCGF9h2Pl5k2HHdfHuFVvttvbYCB76-RfjeonptcGdckMyjrR8SivpZwLeVolohwCwWZuRbVLqgtfPXyNBBkrwyTDkwo4ThVWyeycvGN3ROzwz78sna6jOLJAV7L2V2cZ_knNVHqjIenDjW28q83rww6CROiF8mnX5LuD30GsESQSdqjAcCfMoPObkHj-ODhSRDT6MNa_M8GC1Uz09z6sW1mJL3O6wcHqLrXjH9W3lj8VzbmxusyxirqA/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer> >> >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> *MailScanner has detected a possible fraud attempt from >> "secure-web.cisco.com" claiming to be* >> https://secure-web.cisco.com/1qjSUA20UaLIh48sCqDL8IPFCPaVkwkYw1aWYFTFe37DxiJErf2pXmBqrJPQWzk4ZH3C9SnSkDOPPaSZBtVpGrd6SlBiP_xnSQhDWu1CIoP8Hnn9-Ufkkc_Pphun4UvyqXDWhy1GAYmm7P0GwjmAkI1Edkfn7r-h1RAQg9bKg7xb9WgfgnkqqqUlOeM3ipV6SV2yQClIuJIXpX18gzjURQBCVaJ5u19Llz8VRkN9VHPPipEVINzAxGssHA-96T9xRi8o0tCTCRJ75YFpdNm7ITra9A6he1jhQughe2SYYZeYhAHRlwOTd3A6Sg2qMhNRffztikFU1guoliaaBlbXZEg/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer >> <https://secure-web.cisco.com/1VM0gR7PtCdMPFYb3L3zfpgwLUWOX8ubtu2o8dbtq5I-tn9z-7soFv7DH5K8EI2bXLuPaSVv-pYMQyZnsgcedSe6v2dFI-gCGF9h2Pl5k2HHdfHuFVvttvbYCB76-RfjeonptcGdckMyjrR8SivpZwLeVolohwCwWZuRbVLqgtfPXyNBBkrwyTDkwo4ThVWyeycvGN3ROzwz78sna6jOLJAV7L2V2cZ_knNVHqjIenDjW28q83rww6CROiF8mnX5LuD30GsESQSdqjAcCfMoPObkHj-ODhSRDT6MNa_M8GC1Uz09z6sW1mJL3O6wcHqLrXjH9W3lj8VzbmxusyxirqA/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer> >> The information in this e-mail is intended only for the person to whom it >> is addressed. 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