Hi, Would it be possible to run Fugue using an already generated phase difference map ? The field maps were acquired in two scans. There are two magnitude images. The phase images already have a phase difference calculated and has been unwrapped. The phase difference is mapped onto the image range of 0 to 4095 (original range -180 to +180 degrees). The following link seems to indicate that this might not be possible http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0310&L=fsl&P=R5010&I=-1&m=12 16 However, I was wondering if there is a workaround. Thank you. ...Raj