Patent ID: 6923009

Claim:
A MRI system comprising: a magnet assembly; a first cryogen cooling fluid; a first supply line in communication with said magnet assembly, said first supply line transporting said first cryogen cooling fluid to said magnet assembly; a first return line in communication with said magnet assembly, said first return line transporting said first cryogen cooling fluid away from said magnet assembly; a blower assembly positioned between and in communication with said first supply line and said first return line; a regenerative heat exchanger in communication with said first supply line and said first return line, said regenerative heat exchanger transferring thermal energy from said first supply line to said first return line, said regenerative heat exchanger positioned between said blower assembly and said magnet assembly; a second supply line transporting a second cryogen fluid; a pre-cooler assembly positioned between said regenerative heat exchanger and said magnet assembly, said pre-cooler assembly in communication with said first supply line and said second supply line, said pre-cooler assembly transferring thermal energy from said first supply line to said second supply line; and an after-cooler heat exchanger in communication with said first supply line, said after-cooler heat exchanger transferring thermal energy away from said first supply line; wherein said after-cooler heat exchanger transfers thermal energy from said first supply line into room temperature ambient.