A magnetic resonance examination system (10) includes a superconducting main magnet (20) surrounding an examination region (18) and generating a main magnetic field in the examination region (18) A magnetic field gradient system (30) selectively causes alternating gradient magnetic fields in the examination...http://www.google.com/patents/US8058873?utm_source=gb-gplus-sharePatent US8058873 - Prevention quench in a magnetic resonance examination system
