This data set consists of spoiled gradient-recalled echo magnetic
resonance imaging data from five healthy volunteers (four males and one
female) scanned twice at four sites having 1.5T systems from different
vendors(Siemens, GE, Marconi Medical Systems). Some subjects were also
scanned a single time at another site. One subject was only scanned twice
at three sites (subject 73213384) and once at another site. For each
subject, four Fast Low-Angle Shot (FLASH) scans with flip angles of 3, 5,
20, and 30 degrees were obtained in a single scan session, from which
tissue proton density and T1 maps can be derived. These data were acquired
to investigate various metrics of within-site and across-site
reproducibility. This study was sponsored by the Brain Morphometry
testbed (MBIRN) of the Biomedical Informatics Research Network (BIRN).
The images have been defaced so that no facial features can be
reconstructed from these data.