Hi Alessandra, You're going to want to visually check the quality. If there was a single number to accurately quantify the quality of the registration, then the registration would simply make use of that metric until it hit the intended target threshold. cheers, -MH On Thu, 2012-05-03 at 10:32 +0100, Alessandra Carla' wrote: > Hi, > > I used fnirt to coregister an image to MNI152_T1_1mm. How can understand if I got a good output? > You addressed such an issue in Registration Practical, but would prefer to have a command to obtain a number that assess the 'quality' of non linear registration. > > > Regards. > Alessandra CarlĂ