that's an awfully short TR. Not sure how good the SNR is for the 8 channel, but that might be noisy. We also try to shorten the TE if we can, although you might not be able to. There is an ADNI mprage the exists on the GE platforms, although I'm not sure you're allowed to run it. It's a reasonable sequence. Your results will also depend on the geometry of the 8 coil elements. Some 8 channels we've seen have a very large signal falloff near the top of the head that make them difficult to analyze.
cheers Bruce
On Mon, 19 Jul 2010, antonio cerasa wrote:
Dear Sira Using the same scanner we developed this sequence for Freesurfer analysis BRAVO: TR=9.2 ms; TE = 3.7 ms; flip angle 12°; FOV = 25.6 cm; preparation time= 650 ms; slice thickness= 1 mm; Bandwith= 25. Running time: 5 min, 32 sec.
Antonio Cerasa, PhD Neuroimaging Research Unit, National Research Council, Catanzaro, 88100 Italy.
----- Original Message ----- From: "Mira Michelle Raman" mraman@stanford.edu To: freesurfer@nmr.mgh.harvard.edu Sent: Friday, July 16, 2010 7:27 PM Subject: [Freesurfer] Any suggestions for imaging parameters on a GE 3T with 8 channel head coil
Hi Freesurfers, We would like to optimize the 'Freesurferability' of images for a new project involving fidgety young children. Ideally, the structural scan time will be under 5 minutes. We have a GE Signa 3T MR750, with an 8-channel head coil. Preliminary experiments have found two short structural scan options, but both require some intervention after autorecon2 in the Freesurfer pipeline.
Does anyone have a suggestion for a sequence that
a) runs in under 5 minutes b) freesurfs with minimal intervention
and c) that they would be kind enough to share.
Thank you in advance, Mira ____________________________________________________ Mira Michelle Raman Scientific Programmer Center for Interdisciplinary Brain Sciences Research Stanford University 401 Quarry Rd. Stanford, CA 94305 (650)498-4620
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