MRIs take a considerable amount of time to come to full power and become stable, so they are generally kept powered up for long periods of time.
Depending on the procedure, if it required a higher level of magnet strength, they may well have been increasing it prior to the procedure.
People operate them differently. Same way people operate cars differently.
Still doesn't matter if it's correct to you or not.
It shouldn't of been an accessible room in the first place. Whether it was on of off. I never had metal even go as far as the same vicinity of the MRI rooms.
Sáncte Míchael Archángele, defénde nos in proélio, cóntra nequítiam et insídias diáboli ésto præsídium. Ímperet ílli Déus, súpplices deprecámur: tuque, prínceps milítiæ cæléstis, Sátanam aliósque spíritus malígnos, qui ad perditiónem animárum pervagántur in múndo, divína virtúte, in inférnum detrúde. Ámen