What is the SNR they are getting ? Can't seem to find this info in the paper.
I am also working on a low-field MRi prototype, but at a much lower field (1mT) and using SQUID-based detection. This approach, in theory, allows to have much better T1 contrast, which is an issue raised in this paper. Also, at these levels of field you can use a low-consumption resistive magnet which permits much better field homogeneity.
Anyway the results this team is getting are very impressive and gives me hope that portable MRI is not science fiction. Would love to see some clinical diagnosis data with a bigger sample and more doctors. Will definitely try out their EMI cancellation algorithm on my experiment !