MRI Cold Head
Inside the Magnetic Resonance Imaging (MRI) scanner there is a cooling system that uses liquid helium to keep the magnet cool. The high temperature converts the liquid helium into gas. Inside the cooling system there is a part called a Cold Head that re-condenses the helium gas into liquid. The Cold Head needs periodic replacement for long term normal functioning of the MRI scanner, same as engine oil for vehicles needs to be changed.