[Freesurfer] multi-echo mprage

2013-03-19 Thread Inati, Souheil (NIH/NIMH) [E]
Hi All, I have some multi-echo mprage images from a sequence and protocol set up to emulate Andre's 2008 paper. What's are the best-practices for using data from this type of sequence in Freesurfer? Related side questions: I have used the suggested morphometry protocols on the FS wiki (1mm

Re: [Freesurfer] multi-echo mprage

2013-03-19 Thread Bruce Fischl
Hi Souheil we usually compute the RMS across echoes and give that to recon-all as a normal mprage. It's a reasonable (although of course not optimal) weighting since the earlier echoes have more signal and more contrast. For the T2s, there's a new post-hoc procedure for deformaing the surfaces

Re: [Freesurfer] multi-echo mprage

2013-03-19 Thread Shantanu Ghosh
Hi Souheil I would run the two sets of scans separately; I would expect a T2 bias in the sample if they are run together with ones that have no T2. Perhaps see how T2 images influence the output (maybe have a .fsgd file with T2/noT2 as two levels) to see if there are significnt differences- no?

[Freesurfer] Multi-echo MPRAGE on GE 3T?

2010-04-16 Thread Kippenhan, Shane (NIH/NIMH) [C]
Dear FreeSurfers, Does anyone know if a GE implementation of MEMPR (as described in van der Kouwe et all '08) exists anywhere? Thanks, Shane Kippenhan --- J. Shane Kippenhan, Ph.D. Contractor Imaging Scientist Section on Integrative