Description  Claims  Drawing  Cited references 

WO2006025001A   [0015] 
US6961608B   [0017] 
US6574497B   [0020] 
US6847837B1   [0023] 
US6317091B1   [0024] 
EP0768539A2   [0025] 
US6263229B1   [0026] 

Integrated and interactive position tracking and imaging of interventional tools and internal devices using small fiducial receiver coils   [0016] 
Tracking of an Invasive Device within an MR imaging system   [0018] 
Active Marker of catheters for MRI guided interventions   [0019] 
Forward-Looking Intravascular Orthogonal-Solenoid Coil for Imaging in Occlusive Arterial Disease   [0021] 
Pair of Resonant Fiducial Markers for Localization of Endovascular Catheters at All Catheter Orientations   [0022]