Short answer: yes, it’s cubic mm.
-- Juan Eugenio Iglesias ERC Senior Research Fellow Translational Imaging Group University College London http://www.jeiglesias.com http://cmictig.cs.ucl.ac.uk/
From: freesurfer-bounces@nmr.mgh.harvard.edu on behalf of "Crawford, Anna" CRAWFOA4@ccf.org Reply-To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Date: Wednesday, 17 January 2018 at 19:20 To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] Hippocampal Sub-field volume units
Hello,
i am using the hippocampal subfield segmentation. I am looking at the results in [lr]h.hippoSfVolumes-T1.v10.txt. I saw the following in the FAQs and was unsure of what the units were then in the .txt file. Does the .txt file give units in mm^3?
* The sum of the number of voxels of a given structure multiplied by the volume of a voxel is not equal to the volume reported in [lr]h.hippoSfVolumes*.txt.
This is because the volumes are computed upon a soft segmentation, rather than the discrete labels in [lr]h.hippoSfLabels*.mgz. This is the same that happens with the main recon-all stream: if you compute volumes by counting voxels in aseg.mgz, you don't get the values reported in aseg.stats.
Thank you,
Anna
=================================== Please consider the environment before printing this e-mail Cleveland Clinic is currently ranked as the No. 2 hospital in the country by U.S. News & World Report (2017-2018). Visit us online at http://www.clevelandclinic.org for a complete listing of our services, staff and locations. Confidentiality Note: This message is intended for use only by the individual or entity to which it is addressed and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and destroy the material in its entirety, whether electronic or hard copy. Thank you.