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
