Evaluating Pilot Tone Navigator and BioMatrix Sensor for Motion Assessment using Sliding-Window MR Fingerprinting

Motivation: Respiratory monitoring is critical for robust free-breathing MRI and various methods have been developed. Goal(s): To leverage sliding-window MRF to evaluate the accuracy of respiratory motion assessment obtained from the Pilot Tone (PT) navigator and BioMatrix Sensor and apply to free-breathing abdominal MRF. Approach: Sliding-window MRF was used to measure respiratory motion with a temporal resolution of 0.5 sec to compare with the respiratory motions acquired using PT navigator and BioMatrix Sensor during in vivo scans. Results: PT navigator presents slight improvement in monitoring respiratory motion, but MRF maps reconstructed based on the motion waveforms from all these approaches are consistent in quality. Impact: The knowledge obtained in this study will help design free-breathing abdominal imaging in general and provide critical information in performing quantitative abdominal MRI using MRF.