All images were initially inspected for excess motion and overall quality.  For each individual subject, T2 and FLAIR images were co-registered to the T1 image with an affine transformation and a normalized mutual information cost function using the publicly available software package Analysis of Functional NeuroImages (AFNI\cite{Cox1996a}.  The resulting images were sampled to the grid of the subject's T1 image.  Registered images were visually assessed for alignment.