🚀 go-pugleaf

In article <BzDI7y.53I@cantua.canterbury.ac.nz> geoffrey@cosc.canterbury.ac.nz (Geoff Thomas) writes:
/* 
/* I am wondering whether an NMR machine could be run 'inside-out'. As
/* far as I understand them, NMR imagers consist of a toroidal magnet
/* system, through which the subject is placed. Would it be possible to
/* use a bar magnet type of configuration so that the subject didn't
/* need to be placed within the physical magnet structure?
/* [ascii graphic deleted] 
/* 
/* Can it be done? What range would the system typically be capable
/* of measuring? How big would it be? How much power would be required?
/* 
/* Any help much appreciated. Thanks in advance,
/* Geoff Thomas

From what I understand about MRI, your object must be within a
uniform field. The cylindrical magnet produces an extremely
uniform field. A bar magnet produces a non-uniform field, and thus
would need be awful large to produce a field which is sufficintly
uniform over the region containing the object.

-jeff