I would add that my guess is the FLAIR is helpful up to about 1.25-1.5mm thickest dimension
cheers Bruce
On Wed, 28 Feb 2018, Glasser, Matthew wrote:
The trouble with highly anisotropic resolutions is that your resolution is only as good as your worst axis for the convoluted cerebral cortex. 0.8mm or better would be optimal given a minimum cortical thickness of 1.6mm.
You can always try with what you have and see if it is net beneficial or not.
Peace,
Matt.
On 2/28/18, 12:40 PM, "freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Christopher Markiewicz" <freesurfer-bounces@nmr.mgh.harvard.edu on behalf of markiewicz@stanford.edu> wrote:
Hi all,
I wonder if people have any data (or anecdotes - I'm not picky) with regard to how high of resolution T2w or FLAIR images need to be in order to be useful for FreeSurfer's pial refinement. I've seen a couple threads suggesting the optimal is ~1mm isotropic, and that thick slice (1x1x5 mm^3) FLAIR images could be tried, but might hurt more than help, and I'm wondering if there's a suboptimal-but-still-useful range somewhere in between.
For the record, this isn't a question of what scan parameters are recommended, but rather is in the context of data that's already been collected, which I would like to preprocess as well as possible.
So, at what resolutions would you recommend (a) completely ignoring T2w/FLAIR images; (b) including T2w/FLAIR images that pass QC; (c) trying and seeing? Do these answers change at all with T1w resolution?
-- Chris Markiewicz Center for Reproducible Neuroscience Stanford University
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