Michael,
I had a similar problem with about 10% of pediatric datasets I used.
In my case the problem also often included anterior and ventral
surface of the frontal lobes. Much like you I looked at possible
explanations and a medical physicist and a radiologist I worked with
blamed inaccuracies entirely on chemical shift. Adding control points
at least in temporal lobes generally provided only moderate
improvements.
Greetings,
Jacek
On Wed, Nov 2, 2011 at 4:02 PM, Michael Harms <mha...@conte.wustl.edu>
wrote:
>
> Hi guys,
> We have a sample of 150+ pediatric brains that we pumped through FS 5.1,
> and in an easy majority of them the white/pial surface accuracy in the
> anterior temporal lobe is poor.
>
> I know that this is an area where problems have frequently been
> reported. What is it about that area in particular that makes it
> difficult to get accurate surfaces? (Is the contrast and SNR in that
> area inherently worse?) And, short of a large time commitment of
> control point and wm.mgz editing, are there any flags/tweaks that we
> could attempt to fix the problem in a more automatic fashion?
>
> thanks,
> -MH
>
>
> --
> Michael Harms, Ph.D.
> --------------------------------------------------------------------
> Conte Center for the Neuroscience of Mental Disorders
> Washington University School of Medicine
> Department of Psychiatry, Box 8134
> Renard Hospital, Room 6604 Tel: 314-747-6173
> 660 South Euclid Ave. Fax: 314-747-2182
> St. Louis, MO 63110 Email: mha...@wustl.edu
> --------------------------------------------------------------------
>
_______________________________________________
> 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