Novel pixel-based approach for artifact evaluation of passive implants in MRI validated on intruterine devices at 3T

摘要

Magnetic Resonance Imaging (MRI) at higher magnetic field strengths is becoming more common in clinics but is more prone to artifacts~1, like susceptibility artifacts induced by implants. The ASTM F2119 standard2, which has been established to assess MR signal attenuation induced by passive metallic implants, suggests taking the maximum rectangular area around the artifact in a single slice. Potential drawbacks of this approach are sensitivity to outlier pixels and spatial misrepresentation of implants3. We compare the ASTM F2119 to a novel pixel-based approach in both 2D and 3D using metal-containing intrauterine devices (IUDs) in a phantom as an example for passive implants which have high clinical relevance.