Hi,

If I understand correctly and this is for co-registration you want to coreg the high res EPI to a structural scan and then use this to inform the co-registration of your fMRI EPIs?

If so you need to match the distortions/dropouts that you get in a high res (multi-shot?) EPI. Hence slice thickness, TE, and phase encoding bandwidth per mm needs to be maintained between the high res and your standard EPI.

David

-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Greg Book
Sent: 09 July 2008 18:09
To: [log in to unmask]
Subject: Re: [SPM] High Resolution EPI??

It depends on how high of a resolution you want. On our Siemens 3T Allegra, we are able to achieve 128x128 by 33 slices for a 1.9mm x 1.9mm x 4mm voxel. The TR was 2580ms.

If you use a Siemens scanner, the standard BOLD sequence can be changed to a matrix of 128x128 instead of 64x64 by tweaking the TR, TE, #slices, FOV, and most importantly bandwidth. Our bandwidth was 62.5kHz.

-Greg

On Wed, Jul 9, 2008 at 12:35 PM, Carlos R. Cortes <[log in to unmask]> wrote:

Hello All,
I'm planning to use High Resolution EPI images for co-registration
procedure, but I'm not sure what scanning parameters should I use to obtain
the high resolution...
Any help would be appreciated!!!
Carlos

Carlos R. Cortes, M.D.
Ph.D. Candidate, NACS program, UMBC
Research Associate, Functional Neuroimaging Lab.
Maryland Psychiatric Research Center, University of Maryland Baltimore
Tel. 410-402-6886
e-mail: [log in to unmask]