Shielding, Weight and the Magnet

An MRI has a magnetic field extending beyond the room in every direction, including through the walls, the floor and the ceiling. What sits in those spaces matters, permanently. Ferrous material, moving steel and even the room above and below have to be considered, and this is not something that can be resolved after installation.

There is also an ongoing consequence. Once an MRI is installed, the fringe field constrains what can happen in the surrounding spaces permanently. A practice that later wants to put a treatment room or a staff area on the other side of that wall may find it cannot, and nobody recorded why.

Imaging equipment is large, heavy and rigid, and it frequently cannot be dismantled. The route from the loading point to the room has to accommodate it through every door, corner and level change, and that route has to exist before framing begins.

Where it does not, the answer is usually a removable wall panel designed in from the start. Discovering the problem after the building is finished means opening up work that was already complete.

1. 01Work from the physicist's shielding design, not a rule of thumb.
2. 02Verify structure for the actual equipment weight.
3. 03Plan the delivery route before framing anything.
4. 04Coordinate with the equipment vendor throughout.
5. 05Build RF enclosure and quench venting to the vendor specification.

Plan the equipment route through the building before a wall goes up. Imaging equipment is large and rigid, and there are projects where a finished corridor had to be opened up because nobody checked whether the machine could physically get to the room.

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