Real-Time Respiration Feedback System to Correct Respiration Induced Fluctuation of B0 Field

Motivation: To implement the respiration-feedback system using the respiration monitor signal available at the MRI console and a solenoid shim coil that has been developed for direct neuronal current mapping. Goal(s): To compensate for the respiration induced B0 fluctuation in a real-time mode. Approach: The respiration signal was extracted from the MRI console display using a USB screen capture in real-time. The extracted respiration signal was adjusted and driven to the solenoid shim coil using a custom-built amplifier. Its function was checked by monitoring a resonance frequency at a MRS voxel. Results: The B0 fluctuation was compensated by the captured respiration signal in real-time. Impact: The respiration signal which is available at any MRI console can be used for real-time feedback with a USB capturing device to compensate for the respiration induced B0 fluctuation. This will make the respiration feedback system more easily implementable.