Key Words Extremity imaging Region-growing Ultra-low-field MRI Water-fat separation Get full text access Log in, subscribe or purchase for full access. Availability of data and materials The datasets used and/or analyzed during the current study are available from the first author on reasonable request. REFERENCES 1. He, Y. ∙ He, W. ∙ Tan, L. ... Use of 2.1 MHz MRI scanner for brain imaging and its preliminary results in stroke J Magn Reson. 2020; 319, 106829 2. Yang, L. ∙ He, W. ∙ He, Y. ...