Qaybta weyn ee muhiimka ah ee MRI & NMR waa magnet.Unugga tilmaamaya darajadan magnet-ka ah waxaa loo yaqaan Tesla.Halbeeg kale oo caadi ah oo lagu cabbiro birlabadaha waa Gauss (1 Tesla = 10000 Gauss).Waqtigan xaadirka ah, magnets-ka loo isticmaalo sawirka magnetic resonance imaging waxay ku jiraan inta u dhaxaysa 0.5 Tesla ilaa 2.0 Tesla, taas oo ah, 5000 ilaa 20000 Gauss.