Hi Gabriel,

I mean that the two segmentations may use different definitions of what is hippocampus (e.g. is Fornix part of it?).

cheers Bruce

On Fri, 13 Jul 2012, Gabriel Gonzalez Escamilla wrote:

Thanks Bruce

Yes and no, we did sum all the outputs from the subfields segmentation, but I didnot find the fornix, Is it included I. The fimbria? What would be the difference if I do not include this label? And what do you mean with "different definitions of  what's and is not included"?

Regards, Gabriel

El 12/07/12, Bruce Fischl fischl@nmr.mgh.harvard.edu escribió: 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
  >
  >


  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.

--

PhD. student Gabriel González-Escamilla Laboratory of Functional Neuroscience Department of Physiology, Anatomy, and Cell Biology University Pablo de Olavide Ctra. de Utrera, Km.1 41013 - Seville

• Spain -

Email: ggonesc@upo.es http://www.upo.es/neuroaging/es/