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Purpose  To advance research in the field of machine learning for MR image reconstruction with an open challenge.    Methods  We provided participants with a dataset of raw k‐space data from 1,594 consecutive clinical exams of the knee. The goal of the challenge was to reconstruct images from these data. In order to strike a balance between realistic data and a shallow learning curve for those not already familiar with MR image reconstruction, we ran multiple tracks for multi‐coil and single‐coil data. We performed a two‐stage evaluation based on quantitative image metrics followed by evaluation by a panel of radiologists. The challenge ran from June to December of 2019.    Results  We received a total of 33 challenge submissions. All participants chose to submit results from supervised machine learning approaches.    Conclusions  The challenge led to new developments in machine learning for image reconstruction, provided insight into the current state of the art in the field, and highlighted remaining hurdles for clinical adoption.

Advancing machine learning for MR image reconstruction with an open competition: Overview of the 2019 fastMRI challenge