In vivo MR relaxation times, their inter-subject variations, and changes in different diseases have not been widely studied at very low magnetic fields (<100 mT). In this work, we implemented a 3D MRF sequence on a 50 mT Halbach permanent magnet system to efficiently measure relaxation times in vivo. We used a short flip angle train and further accelerate the scans by using random undersampling and matrix completion reconstruction. Initial in vivo and phantom data show good agreement with relaxation time values measured with less efficient conventional techniques.
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