07 Dec“20Repeats” Now Available

We neuroanatomically labeled the 40 “reliability data” MRI brain scans from the The Open Access Series of Imaging Studies (OASIS) project — 20 subjects scanned twice.  Initially we labeled them without knowing which subjects were which, but then we went back and and compared the same-subject repeat scans and fixed up the anatomy to make the labels match.  But we couldn’t do it perfectly because that would take forever.  The idea is to give a kind of “upper bound” on how well manual labeling can give the same answer on two scans of the same subject.

This is a great data set providing “ground truth” for anyone developing and testing automatic segmentation (labeling) algorithms because the subjects move in between scans so the anatomy is the same, but the scan is different.

The Dice Similarity Coefficients (DSCs) for these repeat-scans were presented in our poster at the recent Society for Neuroscience meeting in Chicago and we subsequently made some additional corrections and now have updated plots and present the actual numbers here.

The 20Repeat scans are available as part of our “2013 Academic Subscription” and also for commercial license.