External Email - Use Caution Thank you for pointing that out! I took another look and was able to get the following;
TotalGray (from the aseg.stats) = 751765.612392 298534.487540 (lhCortex) + 287682.124852 (rhCortex) + 58860.000000 (SubCortGray) + 52358.1 (L_cerebellum-cortex) + 52661.8 (R_cerebellum-cortex) = 750096.512392 There is still a difference of 1669.1. What could account for the difference? Best, Da-Yea From: freesurfer-boun...@nmr.mgh.harvard.edu [mailto:freesurfer-boun...@nmr.mgh.harvard.edu] On Behalf Of Greve, Douglas N.,Ph.D. Sent: Tuesday, November 20, 2018 1:50 PM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] aseg.stats calculations On 11/20/18 1:37 PM, Song, Da-Yea wrote: External Email - Use Caution Hello, I had a question regarding the aseg.stats and was hoping to get some help. 1. How is the TotalGray calculated? On the wiki page it mentioned that it is the sum of lhCortex + rhCortex + SubCortGray + CerebellumGM. I tried calculating this based on the formula but got different results. a. TotalGray (from the aseg.stats) = 751765.612392 b. 298534.487540 (lhCortex) + 287682.124852 (rhCortex) + 58860.000000 (SubCortGray) + 49.3682 (L_cerebellum-cortex) + 50.1232 (R_cerebellum-cortex) = 645176.103792 Check your value for cerebellum cortex. It should be more like 60,000 mm3. You probably are looking at the mean intensity. 2. We have subjects that were processed in v4.0.4 and v6.0.0. Since the TotalGray measure did not exist in the v.4.0.4, what could we use to calculate the volume? How about the above formula? Thank you so much in advance for your help! Best, Da-Yea ________________________________ Disclaimer: The materials in this e-mail are private and may contain Protected Information. Please note that e-mail communication is not encrypted by default. You have the right to request further emails be encrypted by notifying the sender. Your continued use of e-mail constitutes your acknowledgment of these confidentiality and security limitations. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying, distribution, or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender via telephone or return e-mail. _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu<mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer<https://urldefense.proofpoint.com/v2/url?u=https-3A__mail.nmr.mgh.harvard.edu_mailman_listinfo_freesurfer&d=DwMF-g&c=-6Xp7zzYCOuh1vlHYMPGlLDGrbTByhvtrs9nrrENlxA&r=Ej6I9f50Syd-eFwAKeesOPRE0P9n7bIMdmFlrQs00s8&m=4p_j1sHU-AtqQ0C_3_02b2SagUxdq2XXikaBKycMOxc&s=4yXPGritPZx9nr6CriB8e4Tu8QeBL3Hkvnv7gEbtBtM&e=>
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