IC‐P‐185: The impact of gradient field distortion on the calculation of brain atrophy in Alzheimer's disease, derived from volumetric MRI using the boundary shift integral. (1st July 2013) - Einstein, Steven; Bouix, Sylvain; Nielsen, Casper; Clegg, Shona; Les, Andrea; Simon, Howard; Hill, Derek; Margolin, Richard; Sperling, Reisa; Fox, Nick; Liu, Enchi; Novak, Gerald