High-field-strength MR imaging and metallic biomedical implants: an ex vivo evaluation of deflection forces

摘要: Ferromagnetic biomedical implants are considered a contraindication for MR imaging primarily because of the potential hazards associated with their movement or dislodgment. Many metallic composed nonferromagnetic materials and do not present danger to patients during imaging. Therefore, evaluate ferromagnetic qualities 36 different (four aneurysm clips, six hemostatic four dental implants, seven prosthetic heart valves, eight orthopedic prostheses, one artificial urinary sphincter, three contraceptive diaphragms, cerebral ventricular shunt tube connectors) previously evaluated high-field-strength system, we measured deflection forces at portal magnet 1.5-T system. Fourteen were determined be as indicated by in static magnetic field. However, only clips (Drake, Mayfield, McFadden, Sundt-Kees) had sufficient ferromagnetism warrant exclusion these from system possibility displacement. The calculated comparable reported values certain that have been designated risk undergoing Patients 32 tested can safely imaged systems.