Brian:
The grounding/bonding/shielding for all the MRI's we have been involved in is ALL within the MRI Mfg specifications, and is always stringient. The RF shielding is a single point ground on the outside of the RF room.
You probably are talking about RF filters, wich in our case are supplied by a RF contractor that is specified by the MRI Mfg.
We have installed Siemens and GE units, they are basically the same; very stringent specs.
John
