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Hello, we have some troubles with the realign&unwarp routines used in SPM2 (last available package). So we try to understand the code - apparently, the phase encode direction is considered as Y and deformation field and jacobian are calculated for this direction. Then, the defaults.realign.write.wrap value to indicate the direction of the deformation should be always set to [0 1 0] Is this correct ? - How the static field values,if provided, are used during the estimation of partial derivatives of EPI deformation fields (spm_uw_estimate) ? It seems that there are only applied for the final calculation of images deformation (spm_get_image_def). is this right ? -what does the comment "the possibility to include measured field-map temporally removed" in spm_realigned_ui exactly mean ? Many thanks for your help Michel -- Michel Dojat Unité mixte INSERM-UJF U594 "Neuroimagerie Fonctionnelle & Métabolique" CHU de Grenoble - Pavillon B BP 217 38043 Grenoble Cedex 9 Phone: 33 4 76 76 57 48 (secr.) / 33 4 76 76 88 97 (direct) Fax: 33 4 76 76 58 96 TIMC lab: 33 4 56 52 00 69 [log in to unmask] http://www-u594.ujf-grenoble.fr/people/mdojat/index.html