Harald Busse1, Gregor Thrmer1, Nikita Garnov1, Jrgen Haase2, Thomas Kahn1, Michael Moche1
1Diagnostic and Interventional Radiology, Leipzig University Hospital, Leipzig, Germany; 2Physics and Earth Sciences, Leipzig University, Leipzig, Germany
A new wireless technique for the tracking of intravascular catheters is presented. The semi-active approach uses a robust morphological image analysis tool to automatically detect the local signals from two small RF coils mounted on a commercial 6F catheter. A fast SSFP sequence at very low flip angles (≈0.3) provided sufficient marker contrast to reliably localize the catheter in a vessel phantom (≈97% of 1036 trials) within ≈350 ms. Tracking may be realized by continuously superimposing the marker coordinates on a roadmap (≈3 updates/second) or by adjusting the slice geometry of a fast MR scan to the actual catheter orientation.