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Abstract #2620

Gradient Heating of Bulk Metallic Implants

Rüdiger Brühl1, Albrecht Ihlenfeld1, and Bernd Ittermann1

1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, Germany

The temperature increase of an excised hip prosthesis was measured under exposure to the switched gradients of a clinical 3T scanner. For the acetabular cup, insulated or embedded in gelatin gel, temperature increases of ΔT=25.8 K and 3.8 K, respectively, were observed within 10 min. From the initial temperature increase of up to 110 mK/s a gradient-induced heating power of PG = 370 W/kg in adjacent muscle can be derived and this quantity's relation to local SAR is discussed. The results suggest that gradient-induced heating of bulk metallic implants cannot automatically be assumed to be negligible.

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