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Abstract #1793

How Safe Are Intrauterine Devices at MRI Procedures with Field Strength Beyond 1.5T?

Jaane Rauschenberg1, Jens Groebner1, Wolfhard Semmler1, Michael Bock1

1Medical Physics in Radiology, German Cancer Research Center, Heidelberg, Germany

The widely used intrauterine contraceptive devices (IUD) had been evaluated for MR-safety only up to field strengths of 1.5T. In this work we performed ASTM measurements of 5 different IUDs at 3T. Additionally, we estimate the potential risk at 7T examinations. The metal-free hormone-containing Mirena IUD has a magnetic retraction thread but it does not produce hazardous heating. For copper-alloy IUDs no magnetic force and no torque could be detected; however, the temperature rise due to RF was up to 3C during 15 min at 3T. For 7T head examinations no potential risk could be detected with the hardware used.