Septal repair implants: evaluation of magnetic resonance imaging safety at 3 T.
Specialized implants are used for transcatheter closure of septal defects, including atrial and ventricular septal defects, and patent foramen ovale. These metallic devices may pose a risk to patients undergoing magnetic resonance imaging (MRI) procedures especially if performed at 3 T. Therefore, this investigation evaluated MRI safety at 3 T for septal repair implants (CardioSEAL Septal Repair Implant and STARFlex Septal Repair Implant, NMT Medical, Boston, MA, USA) by characterizing magnetic field interactions, heating and artifacts. These implants exhibited minor magnetic field interactions; heating was not excessive (+0.5 degrees C); and artifacts will only create a problem if the area of interest is in the same area as or near these devices. Thus, the findings indicated that it would be safe for a patient with these implants to undergo MRI at 3 T or lower. Importantly, because of the minor magnetic field interactions, MRI may be performed immediately after implantation.
Shellock
Frank G
FG
Department of Radiology and Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90045, USA. frank.shellock@gte.net
Valencerina
Samuel
S
D000497:Alloys; D016477:Artifacts; D004869:Equipment Safety; D006343:Heart Septal Defects / Q000601:surgery*; D006358:Hot Temperature; D006801:Humans; D008279:Magnetic Resonance Imaging; D019047:Phantoms, Imaging; D019736:Prostheses and Implants; D011474:Prosthesis Design; D019415:Torque
D000497:Alloys; C013616:nitinol