title: Investigation of radiofrequency-induced temperature elevation of aneurysm clips in a 3.0-tesla magnetic resonance environment.
abstract: OBJECTIVE
  Burn injuries associated with excessive heating of medical metallic devices have been reported, but a definite mechanism for magnetic resonance imaging-induced heating remains unresolved. The aim of this study is to evaluate temperature elevation of metallic wires, aneurysm clips, and clips attached to metallic wires under 3.0-T magnetic resonance imaging.
  
  
  METHODS
  The temperature of the metallic wires, the aneurysm clips, and the clips attached to the metallic wires was measured with a fiber optic thermometer sensor system.
  
  
  RESULTS
  Although the specific absorption rate was less than that observed during standard use, the temperature rapidly increased in the metallic wire. Furthermore, temperature elevation was observed when the clips were attached to metallic wires. On the other hand, not all clips showed obvious temperature elevation when they were placed alone in a 3.0-T magnetic resonance imaging environment.
  
  
  CONCLUSIONS
  Aneurysm clips, when placed alone in a 3.0-T magnetic resonance imaging environment, are confirmed to be safe during temperature elevation.
authors: Department of Neurosurgery, Seguchi Neurosurgical Hospital, Iida, Japan. watanabe@zg7.so-net.ne.jp
authors: Atsushi
authors: A
authors: Watanabe
authors: Tatsuya
authors: T
authors: Seguchi
authors: Jun-ichi
authors: J
authors: Koyama
authors: Tatsuro
authors: T
authors: Aoyama
authors: Takahiro
authors: T
authors: Miyahara
authors: Yukinari
authors: Y
authors: Kakizawa
authors: Kazuhiro
authors: K
authors: Hongo
mesh_terms: D000783:Aneurysm / Q000601:surgery*; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008279:Magnetic Resonance Imaging; D008670:Metals / Q000528:radiation effects*; D011829:Radiation Dosage; D011846:Radio Waves; D013525:Surgical Instruments; D013696:Temperature
chemical_list: D008670:Metals