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Dear Mayuresh What sequence are you using to acquire these fieldmaps? Best wishes Chloe On Wed, June 3, 2009 06:55, Mayuresh K wrote: > Dear SPM users, > > > I am trying to use the SPM5 field map toolbox with our phase maps. I am > having problems with generating the "vdm5*.img". There seem to be some > sort of a wrapping effect in my vdm image. I am attaching screen shots of > the spm display graphics window for the vdm5 image (attached vdm5_img.jpg) > and the original phase image from our sequence (attached phase_img.jpg). I > am using the default options for phase wrapping i.e. Mark3D algorithm when > creating the VDM5 image. > > Any suggestions to tackle this problem will be very helpful. > > > thanks, Mayuresh > > -- Dr Chloe Hutton Wellcome Trust Centre for Neuroimaging Institute of Neurology University College London 12 Queen Square London WC1N 3BG United Kingdom Tel. +44-20-7833-7478, (internal ext 4368) Fax +44-20-7813-1420 [log in to unmask]