Generally, the shielded x-ray source of the present invention has a cast shield of an iron based material substantially enclosing and closely conforming to the x-ray tube to shield the x-ray tube imaging beam from interference from magnetic fields. The method of the present invention includes providing...http://www.google.de/patents/US6352363?utm_source=gb-gplus-sharePatent US6352363 - Shielded x-ray source, method of shielding an x-ray source, and magnetic surgical system with shielded x-ray source
