tinfoil hat does NOT help with that. field tested

It works, weber you like it or not (⌐⊙_⊙)

(Slightly more seriously, the diamagnetic properties of Sn would in actuality very much interfere with the B1 field modulation of the (f)MRI sequence; and disturb the local B0 homogeneity; and thus disturb the experimental results. Although that was of course not what I meant when initially responding)