This might well be true. A high-Tesla research MRI imager is a pretty
interesting thing. Particularly the very high field intensity in a
large coil aperture distinguishes it strongly from other mainstream
cryomagnet applications, as e.g. NMR spectrocopy. While it won't let you
levitate in field gradients as frogs and waterdrops can do, you should
not be moved rapidly because we are an electrolyte bag.
Also, the RF power deposited is noticeable, and, together with certain
pulse sequences can mean bad things to obese patients. One should be
able to induce potential differences, but the voxel size should be
pretty large. Meaning, tweaking being likely coarse.
ciao,
'gene