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This collection presents a series of articles describing human brain scans – produced with a variety of magnetic resonation imaging (MRI) methods and modalities – which are designed to help researchers assess the reproducibility of brain imaging techniques and to develop new methods based on these data-types. Central to this collection are studies from the Consortium on Reliability and Reproducibility (CoRR), an initiative that has organized the release of data from thousands of individual brain scans collected at 18 international sites.