Hi, In FS, “Intracranial volume”, renamed to “EstimatedTotalIntraCranialVol” (aka “eTIV”) in more recent FS versions, is solely based on the determinant of a talairach transform that is internal to FS. That particular transform does not necessarily need to be accurate for FS to generate accurate surfaces/segmentations, so we did not QC it. For that reason, I do not recommend using it.
Cheers, -MH -- Michael Harms, Ph.D. ----------------------------------------------------------- Conte Center for the Neuroscience of Mental Disorders Washington University School of Medicine Department of Psychiatry, Box 8134 660 South Euclid Ave. Tel: 314-747-6173 St. Louis, MO 63110 Email: [email protected] From: <[email protected]> on behalf of Chao Zhang <[email protected]> Date: Wednesday, November 22, 2017 at 2:25 PM To: "[email protected]" <[email protected]> Subject: [HCP-Users] FreeSurfer brain volume question Hi We were checking the FS brain volumes and found that out of the 1113 subjects for 14 subjects the FS_BrainSeg_Vol is larger than the FS_IntraCranial_Vol (so that the column FS_BrainSegVol_eTIV_Ratio is larger than 1). We wonder if this is due to some error in calculating either of the two columns (FS_BrainSeg_Vol, FS_IntraCranial_Vol)? Thanks! Best, Chao _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail. _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
