Peter
Nordbeck1,2, Oliver Ritter1, Ingo Weiss3,
Daniel Gensler2, Marcus Warmuth2, Volker Herold2,
Peter M. Jakob2, Mark E. Ladd4, Harald H. Quick5,
Wolfgang R. Bauer1
1Internal Medicine I, University of
Wrzburg, Wrzburg, Germany; 2Experimental Physics V, University
of Wrzburg, Wrzburg, Germany; 3Biotronik GmbH & Co. KG,
Berlin, Germany; 4Diagnostic and Interventional Radiology,
University of Duisburg-Essen, Essen, Germany; 5Medical Physics,
University Erlangen-Nrnberg, Erlangen, Germany
The
purpose of this study was to further assess the impact of the imaging
landmark on the risk for unintended MRI-induced implant heating by measuring
the RF-induced electric fields in a body phantom under several imaging
conditions at 1.5 T in 3 different scanners. The results show that global RF
coupling is highest with the torso centered along the superior-inferior
direction of the transmit coil. The induced E-fields inside the body shift when
changing body positioning. Potential hazards can be reduced by adequate
selection of MR imaging landmark in patients with implanted medical devices.