Abstract #4309

Measurement of magnetic susceptibility of commonly implanted metals from commercial prostheses

Matthew Robert Smith¹, Jin Jung Kweon², Eun Sang Choi², Curtis Wiens¹, Nathan Artz³, and Scott B Reeder^1,4

¹Radiology, University of Wisconsin, Madison, WI, United States, ²Florida State University, Tallahassee, FL, United States, ³St. Jude's Children's Hospital, Memphis, TN, United States, ⁴Medical Physics, University of Wisconsin, Madison, WI, United States

Despite important recent development, further progress of MR imaging around metallic prostheses is dependent on the ability to model the field perturbations surrounding the prostheses. These calculations require knowledge of the magnetic susceptibility of the metal which is not reported by the manufacturers. The purpose of this work was to estimate the magnetic susceptibility of commonly implanted metal alloys by measuring the magnetic moment across a range of clinical field strengths (0-5 Tesla) using a SQUID (Superconducting QUantum Interference Device) magnetometer. Linearity of the susceptibility across field strengths was also assessed.

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