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Dear Van, That is very, very wrong. I get the following from the phase image you sent me: -3653.847900 3617.096191 -4096.000000 4092.000000 -1180.000000 -138.000000 850.000000 and from the fieldmap in radians per second (that I created using the echo spacing of the fieldmap that you sent me): -2774.719238 2746.809570 -3110.487793 3107.450195 -896.087769 -104.796707 645.486938 The first image is not in radians but some scaled version that the scanner manufacturers seem to like (stretching the 2*pi range over +/- 4096). So I scaled this by pi/4096 to get radians and then divided this by 0.00101 to get to radians per second. It looks like you just divided your original "phase" image (which is not yet converted to radians) by 0.00101 and got something which is not radians per second. If you follow the steps above (scale by pi/4096 and then divide by 0.00101) then you should get a correct image in radians per second that you can then use with fugue. All the best, Mark On 14 Mar 2011, at 08:14, Van Lee wrote: > Hi, > > Here is the output of the command > > fslstats phase_image -r -R -P 25 -P 50 -P 75 > -3609564.250000 3573176.500000 -4055445.500000 4051485.250000 -1148514.875000 -128712.882812 835643.562500 > > Thanks a lot! > > Regards, > > Van L >