Real-Time Spinal Cord Motion Tracking for MR-guided Spine SBRT (A Pilot Study)

This study demonstrated the possibility of real-time tracking of the spinal cord using 2D-cine MRI on an MR-Linac system. Future work will aim to increase sample size and evaluate the reproducibility of the tracking results over time. The excursion of the thoracic/lumbar spinal cord was found to be less than 0.5mm, while the anterior/posterior or superior-inferior excursion of the cervical spine was greater than 1.0mm during the 20-minute scan.