Hi Zih-Kai, the subfield and main FreeSurfer streams are different and therefore give different results. On average, the volumes estimated by the subfield stream will be lower, but very highly correlated with those from the main FreeSurfer stream. I hope this helps! /Eugenio
Juan Eugenio Iglesias Postdoctoral researcher BCBL www.jeiglesias.com www.bcbl.eu Legal disclaimer/Aviso legal/Lege-oharra: www.bcbl.eu/legal-disclaimer ----- Original Message ----- From: "高子凱" <clandestine1...@gmail.com> To: freesurfer@nmr.mgh.harvard.edu Sent: Friday, January 16, 2015 5:24:40 AM Subject: [Freesurfer] Volume in hippocampus and its subfields Dear All, I recently begin to use the latest FreeSurfer version to segment subcortical and hippocampus subfields in human brain of MR image. The result shows left hippocampus volume is 4332.6 mm^3 and volumeInVoxels of hippocampus subfields as below: Left-Hippocampus: 3017.11 left_presubiculum: 4103.92 left_CA1: 2247.6 left_CA2_3: 6919.65 left_fimbria: 597.982 left_subiculum: 5209.91 left_CA4_DG: 3914.19 left_hippocampal_fissure: 327.23 After I sum of the voxels and divided it by 8 ( each voxel is of the size "0.5x0.5x0.5mm^3" ), the result (3929.199 mm^3) is not equal to the hippocampus volume (4332.6 mm^3). I am quite confused how to do so. It would be great if you could advice me. Thanks a lot for your help. I really appreciate it. Beat Regard, ZK -- Zih-Kai Kao Clinical Research Assistant Psychiatry Department of Taipei Veterans General Hospital No.201, Sec. 2, Shipai Rd., Beitou District, Taipei City, Taiwan 11217, R.O.C. tel:+886-2-28712121#2912 fax:+886-2-28742421 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer 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. _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
