SPARTA-3D: 3D Real-time Tracking Solution for Interventional MRI

Motivation: MRI excels in exceptional soft tissue delineation and its radiation-free nature in interventional contexts. However, achieving effective 3D real-time tracking with MRI poses a significant challenge. Goal(s): To facilitate 3D real-time monitoring and navigation, achieving a high temporal resolution and enhanced spatial resolution that precisely captures the movement of small interventional instruments. Approach: We utilized a manually controlled device and employed highly accelerated golden-angle rotated spiral-in/out sequence with randomized variable density kz encoding, along with a specifically tailored iterative reconstruction algorithm. Results: High temporal (150 ms/phase) and spatial (0.7×0.7×1.5 mm3) resolutions were achieved, smoothly visualizing minute movements in 3D within our phantom setup. Impact: The SPARTA-3D approach holds the promise of revolutionizing interventional MRI by meeting the crucial demand for 3D real-time tracking and navigation. It could facilitate more rapid and less invasive procedures, opening up novel avenues in the domain of MR-guided interventions.