Hi Gabriel,

certainly they won't match as (a) they are different algorithms, and (b) they are different definitions of what is and is not included. Did you sum up things like fimbria and fornix in your subfield totals?

cheers Bruce On Thu, 12 Jul 2012, Gabriel Gonzalez Escamilla wrote:

Hello,

after applying hippocampal subfield segmentation to our sample, we noted tha t summation of hippocampal subfields (in mm3) differs considerably from hipp ocampal volume (derived from aseg) in some of our subjects:

case 1: 2592 mm3 (aseg hipp. volume) versus 2116 mm3 (summation of hipp. sub fields)

case 2: 4764 mm3 (aseg hipp. volume) versus 4002 mm3 (summation of hipp. sub fields)

case 3: 1914 mm3 (aseg hipp. volume) versus 2110 mm3 (summation of hipp. sub fields)

Please let me know why this is happening, and if this mismatching can be con sidered normal.

Thank you very much in advance.

Best regards, Gabriel