A Novel Omnidirectional Marker for Catheter Tracking in endovascular MRI Applications at 0.55T

Motivation: Real-time catheter tracking in MRI-guided procedures is essential but is often hindered by signal loss due to catheter orientation and interference from the B1 field, which diminishes contrast. Goal(s): This study develops an omnidirectional catheter marker with an LC structure for consistent tracking across all orientations. Approach: Simulations were used to design the marker, featuring alternating inductor windings and a custom capacitor to achieve the target Larmor frequency. The marker performance was evaluated across six orientations in a torso phantom. Results: The marker demonstrated reliable B1 field elevation near the inductor, enhancing contrast and ensuring effective orientation-independent catheter tracking. Impact: This research enhances real-time catheter tracking in MRI-guided procedures through an innovative omnidirectional catheter marker. Improved tracking accuracy can lead to safer interventions and better patient outcomes, ultimately increasing the effectiveness of interventional MRI in diverse clinical applications.