MR Safety Measurements of Intracranial Fixation Devices at 7T

Jaane Rauschenberg¹, Jens Groebner¹, Armin Michael Nagel¹, Armin Biller^2,3, Wolfhard Semmler¹, Michael Bock¹

So far, the widely used cranial bone fixation system CranioFix has been evaluated to be MR-safe up to field strengths of 3T. In this work we performed ASTM measurements of the implants at 7T MRI. As the magnetic force is much less than the gravitational force, no torque could be detected, and the temperature rise was less than 1C during 16 min the implants can be considered as MR safe for the hardware used. Furthermore, artifact width is acceptable. This result enables MR imaging studies after brain surgery to be performed at field strengths up to 7 Tesla.