3 years ago

Real-time correction of respiration-induced distortions in the human spinal cord using a 24-channel shim array

Julien Cohen-Adad, Nikola Stikov, Alexandru Foias, Ryan Topfer
Purpose To reduce respiration-induced magnetic field distortions and the attendant image artifacts in echo-planar imaging (EPI) of the human spinal cord. Methods Using a custom-designed 24-channel shim array, shim updates were issued in real time based on a concurrently monitored respiratory trace and a pair of gradient echo (GRE) field maps acquired during an initial training phase. Proof-of-concept application in GRE–EPI was conducted in 6 subjects. Results Over the thoracic spinal cord, real-time shimming reduced respiration-induced distortions in the EPI by 48.2% ± 12.2% and increased the mean temporal signal-to-noise ratio by 15.7% ± 7.9%. Conclusion Real-time shim adjustment substantially reduces spatiotemporal B0 field variation, opening the door to more robust imaging and spectroscopy investigations of the spinal cord. Magn Reson Med, 2018. © 2018 International Society for Magnetic Resonance in Medicine.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/mrm.27089

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