Hi Mike
the 3.5-4mm thickness probably makes them not usable since it means opposing banks of a sulcus will be in the same voxel pretty frequently
sorry Bruce On Mon, 24 Jun 2013, Michael Kranz wrote:
Hi all,
I'm having trouble determining whether or not to use our T2 images for the new pial refinement feature. Most importantly, I'm wondering if our T2 image parameters are sufficient for the T2 pial refinement. The parameters of our T2 images are as follows:
T2 TSE overlay with a voxel size of 1.1x1.1x3.5 mm (slice thickness).
A couple other studies in our lab have a voxel size of 0.9x0.9x4.0 mm.
Note that our MPRAGE voxel size is .9x.9x.9mm.
In your release notes, it states we should uaround a 1x1x1mm (let me know if you need additional specifications such as geometry bandwidth etc): "T2/FLAIR used for pial surface refinement: if you have T2 or FLAIR scans ~1mm^3, then they can be used by the recon-all stream to refine the pial surfaces".
I have experienced about 1/4 of our subjects with errors using the T2 pial flag. As a next step, if you think the parameters are acceptable, then I can send you some screen shots different errors that I have encountered wit these subjects.
Best, Mike