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Abstract #3373

Dynamic off-resonance correction in 3D-EPI using dual FID navigators

Ola Norbeck1,2, Stefan Skare1,2, Sophie Schauman 2, Henric Rydén 1,2, Tim Sprenger3, Enrico Avventi1,2, and Adam van Niekerk2
1Karolinska University Hospital, Stockholm, Sweden, 2Karolinska Institutet, Stockholm, Sweden, 3GE Healthcare, Munich, Germany

Synopsis

Keywords: Artifacts, Data Acquisition, SWI, 3D-EPI

Motivation: 3D-EPI imaging is sensitive to magnetic field (B0) fluctuations, particularly from breathing, which can cause artifacts in brain imaging.

Goal(s): Our goal is to implement a straightforward technique for correcting B0 fluctuations during 3D-EPI scans. The approach targets artifacts caused by respiratory motion, aiming to improve image quality without complex post-processing.

Approach: We incorporated dual FID signals into the 3D-EPI sequence, estimating and correcting frequency shifts from B0 fluctuations. Data were collected during intentional deep breathing.

Results: Applying the dual FID correction significantly reduced artifacts related to breathing. The estimated B0 fluctuations correlated well with respiratory movement measurements.

Impact: This correction method enables artifact reduction in 3D-EPI imaging, improving image quality for studies affected by breathing-induced B0 fluctuations. It offers potential for application in functional and structural MRI, advancing the reliability of 3D-EPI sequences for clinical and research use.

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