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... as a follow up to Stan's post: I usually acquire my fieldmap with the same slice prescription as the functionals, but Chloe mentioned once that the fieldmap is refitted to the EPI grid anyway. So using the same slices may reduce interpolation but does not seem to be critical. Cheers, Marko Stan Hrybouski wrote: > You have to ask your MR tech to send you this info (TEs from gradient > echo images that are used to create a phase difference image, eco > spacing, phase encode direction, etc...) Siemens produces a document > with all the parameter scans. GE should have something similar. > Stan > > On Wed, Oct 24, 2012 at 12:35 PM, Sepeta, Leigh > <[log in to unmask] <mailto:[log in to unmask]>> > wrote: > > Hi All,____ > > __ __ > > What are the appropriate parameters (i.e., TEs, TR, phase encoding > direction, etc) for creating a field map scan on a GE 3T scanner to > be used later to correct EPI distortions? Also, should the field map > be the exact dimension/slices as the EPI images?____ > > __ __ > > Thank you in advance for any help that you can provide!____ > > __ __ > > -Leigh ____ > > __ __ > > __ __ > > -- ____________________________________________________ PD Dr. med. Marko Wilke Facharzt für Kinder- und Jugendmedizin Leiter, Experimentelle Pädiatrische Neurobildgebung Universitäts-Kinderklinik Abt. III (Neuropädiatrie) Marko Wilke, MD, PhD Pediatrician Head, Experimental Pediatric Neuroimaging University Children's Hospital Dept. III (Pediatric Neurology) Hoppe-Seyler-Str. 1 D - 72076 Tübingen, Germany Tel. +49 7071 29-83416 Fax +49 7071 29-5473 [log in to unmask] http://www.medizin.uni-tuebingen.de/kinder/epn/ ____________________________________________________