Patent ID: 9533167
Date: 2017-01-03
CPC Classifications: A61B,A61N

Claim:
1. A magnetic resonance imaging (MRI) system comprising: a magnet system configured to generate a polarizing magnetic field about at least a portion of a subject arranged in the MRI system, wherein subject includes a non-ferromagnetic medical implant arranged therein and including at least one cavity and at least one ferromagnetic or ferrimagnetic material arranged within the at least one cavity, wherein the ferromagnetic or ferrimagnetic material formed as a sphere that is substantially free to rotate within the at least one cavity; a plurality of gradient coils configured to apply a gradient field to the polarizing magnetic field; a radio frequency (RF) system configured to apply an excitation field to the subject and acquire MR image data therefrom; a computer programmed to carry out the steps of: