Nikita Garnov1, Gregor Thrmer1, Wilfried Grnder2, Robert Trampel3, Michael Moche1, Thomas Kahn1, Harald Busse1
1Diagnostic and Interventional Radiology, Leipzig University Hospital, Leipzig, Germany; 2Institute of Medical Physics and Biophysics, University of Leipzig, Leipzig, Germany; 3Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
Small inductively coupled RF coils in solenoid design were systematically evaluated as MR-visible markers at 1.5T. Coil performance was assessed for different flip angles, 240 mm translations from the isocenter, and tilting of the coil axis with respect to the transverse plane using a balanced SSFP sequence. Marker contrast was highest at very low FAs (0.2-0.6) and was also sufficiently high for automatic marker detection throughout the entire FOV and for tilt angles up to 55. Coil heating was measured during 10-minute RF expositions using different clinical pulse sequences (SAR<2 W/kg) and found to be tolerable (<5C) for extracorporal application.