Reinhard
Rzanny1, Andreas Hansch2, Alexander Pfeil3,
Alexander Gussew1, Stefanie Drobnik4, Jrgen R.
Reichenbach5
1Medical Physics Group, Department of
Diagnostic and Interventional Radiology, Jena University Hospital, Jena,
Germany; 2Department of Diagnostic and Interventional Radiology, Jena University Hospital, Jena,
Germany; 3Department of Internal Medicine III, Jena University
Hospital, Jena, Germany; 4Department of Cardiothoracic Surgery,
Jena University Hospital, Jena, Germany; 5Medical Physics Group,
Department of Diagnostic and Interventional
Radiology, Jena University Hospital, Jena, Germany
The
presence of pacemaker leads is considered to be a safety contraindication for
MRI. To measure heating effects at the tip of temporary pacemaker leads, the
frequency shift of water was estimated by single voxel 1H-MRS. The
temperature dependence of the water frequency in the myocardial tissue was
estimated in prior preliminary experiments during 3 warming and cooling
cycles of a heart between 20 and 40C. As a result of applying several MR
imaging sequences on 12 pig hearts with implanted temporary pacemaker leads
in a whole body MRI (1.5 T), no substantial heating was observed.