External Email - Use Caution Many thanks. Best
On Tue, Jul 20, 2021, 14:36 Douglas N. Greve <dgr...@mgh.harvard.edu> wrote: > The two methods are totally different. See > https://secure-web.cisco.com/1M9K3lSgALVk9H3YxzU4beySwAyD9LUr7aJIifLSz-a7CIwOjqchQeDJmULEhZQimw6d5hvIcBSQqZVqxAftbYdxFGAIr5X7PieRivW9QqQ-_ehTgwu5UEaxyyL6RNeh8hd-JqZFTCBQSuqgoVcUsARxUx3AczZ6LUu8DXczEvK3n1dpH4MnGMuqUTiQQqNdnQTfi0qXdkVLxXEGMob8dOqEgPceJ_C_gFx6b-zO8mJ4b6dyAU9WMgWiIjJfx9swlhLDYiocIISemxB8oV1Q8rw/https%3A%2F%2Fsurfer.nmr.mgh.harvard.edu%2Ffswiki%2FsbTIV > the sb version actually performs a skull segmentation and counts voxels > within skull. The eTIV is computed from the talairach registration, which > is going to be inherently more variable (eg, more or less neck will affect > it). > > On 7/20/2021 3:24 PM, AJ wrote: > > External Email - Use Caution > Hi, > I am looking at interscanner differences between Philip and GE. I get > significantly less variation between the scanners when looking at sbTIV > (coefficient of variation < 1.5 %) than eTIV (12%) within subjects. Any > thought as to why? Normalizing ROIs with sbTIV improves these differences > even more. > > Thanks for your help. > > AJ > > _______________________________________________ > Freesurfer mailing > listfreesur...@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://secure-web.cisco.com/1DDuQL9Kl6zOIpPWhQAXUSEacQhKZw8Sr9xZB53po8hkAxWnQBvoJ-V5QiJG4quxb2XjvnFhKn2MSRmPToiQ1JedrPt2NQ_icR4URDqeaj0nOfnW9h1xXllzTFRcCRDEFZ5i07k2ryqIjA4Ox_c_P3-gPGH42SZ8zp7qIYn21ZjpsLqwxGR-iZqwmMhw-zi1vN1oohOwj0XMyqF9eJd7iLodKNFFCc2IbO3BdUvZ2p8cD6G_2YAPSzykUPIlClQEmVgkU-SDREXPpw164Pl3Jdg/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. If you believe this e-mail was sent to you in error and the > e-mail contains patient information, please contact the Mass General > Brigham Compliance HelpLine at > http://secure-web.cisco.com/15fQ02uIVGDHLLoPbHL29Ebc66_OWtqHdmJ8-A9X0uO9wG6fIcOF7HVIL_Yyk57OoXyINlKTheC6JNXlXC7nJHUDnd1HIFVM69Jr26quh8wNg-4Aeak0fRJWCCLO4urUsTd2eHV-AZ7DvrNFB9LHjI7KUdfJB-l9R51vvr1b933UOoWUsCrP22w5GkjDS4dsSYzhTPv0SVj_EuQ5qmHlFGtGfurmfV7KAmCmCeb9dma2tlVcOlXNVV1HwyW0Zbd0v-ncigYsoaTCckc5sP1PdZQ/http%3A%2F%2Fwww.massgeneralbrigham.org%2Fcomplianceline > . 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. > Please note that this e-mail is not secure (encrypted). If you do not > wish to continue communication over unencrypted e-mail, please notify the > sender of this message immediately. Continuing to send or respond to > e-mail after receiving this message means you understand and accept this > risk and wish to continue to communicate over unencrypted e-mail. >
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