> We have experimentally estimated in our preliminary study that the apparent T1/T2 values for gray matter and white matter were approximately 330/110 ms and 260/100 ms at 0.055 T (vs. 1300/110 ms and 830/80 ms at 3 T51) while CSF maintains long T1 (>1500 ms) and T2 (>1000 ms).
That's not particularly different from normal MRIs, and the achieved resolution is not that much worse than normal MRIs. The scans have lower contrast (and repeated/longer scans is one way to improve that) and using for functional imaging will make that worse, but honestly it doesn't seem to have suffered very much at all.
> First, these scanners rely on complex superconducting electromagnet/cryogenics designs and ever increasingly powerful electronics (including gradient and radiofrequency power systems) for fast imaging and/or advanced imaging features like brain functional MRI and diffusion tractography, yet routine clinical uses only necessitate a small portion of these imaging protocols.
That's not particularly different from normal MRIs, and the achieved resolution is not that much worse than normal MRIs. The scans have lower contrast (and repeated/longer scans is one way to improve that) and using for functional imaging will make that worse, but honestly it doesn't seem to have suffered very much at all.