 |
 |
you need two images from your fieldmap, 1 is phase and the other is magnitude. both are necessary for the correction. Cheers, Michael On Mon, Mar 8, 2010 at 6:38 AM, Huang, Wei (Psychiatry) < [log in to unmask]> wrote: > Dear SPMers, > > > > I'm trying to use SPM8 "Realign and unwarp" to correct the EPI distortion, > however, my fieldmap acquired from a Philips 3T scanner has two volumes - > after I convert the Par/Rec file to img/hdr, it gives me two separate > images, one looking like a normal T1, the other looking like a B0 but has > the skull (see attached). My EPIs all don't have the skull. My question > is, which one of these two should I use to unwarp? If the B0, How can I > strip the skull and/or use it for unwarping? I have no experience in > fieldmaps, so any comment/suggestion would be appreciated. > > > > Thank you very much, > > > > Wei Huang, PhD > > Center for Comparative NeuroImaging (CCNI) > > Department of Psychiatry > > University of Massachusetts Medical School > > 55 Lake Ave North > > Worcester, MA 01604 > > Tel: (508) 856 8261 > > Fax: (508) 856 8090 > > > -- Research Associate Gazzaley Lab Department of Neurology University of California, San Francisco