MR data were collected on a GE 3T Signa scanner with an 8-channel phased-array head coil. Brain volumes were derived from T1-weighted Inversion-Recovery Prepared SPoiled Gradient Recalled (SPGR) images (TR=7 ms, TE=2.2 ms, TI=300 ms, thick=1.25 mm, skip=0 mm, 124 slices, scan time=9:43 min) and dual-echo Fast Spin-Echo (FSE) images (TR=8583 ms, TE=13.5/108.3, thick= 2.5 mm, skip=0 mm, 62 slices).
