Hi Sampada, the two measurements are obtained through different methods. The aseg estimate is generally smaller because it doesn't include the whole midbrain, whereas the brainstem module does. Which one is more accurate depends on your anatomical definition of brainstem. Compared with the ASEG, the brainstem module has the advantage that it provides the parcellation into pons, medulla, midbrain and SCP. Cheers, 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: "Dr Sampada Sinha" <drsampadasi...@gmail.com> To: "Freesurfer support list" <freesurfer@nmr.mgh.harvard.edu> Sent: Wednesday, August 12, 2015 3:52:36 PM Subject: [Freesurfer] Regarding: Brainstem volumetric result Dear freesurfer experts, I successfully managed to install and run the freesurfer dev version6 for brainstem segmentation analysis. But, looking at the result of brainstem volume in brainstemSsVolumes.v10.txt, the whole brainstem volume is 14439.355323 and the brainstem volume by recon-all out asegfile is 13217.8 in the same participant. Will you please let me know why this disparity is there? And which one is more accurate? We plan to use the medullary volume for our study (here the medullary volume of the participant is 3184.900208 ) Thanks and regards, Sampada -- Sampada Sinha AIIMS, New Delhi _______________________________________________ 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
