Segmented Trajectory Correction for Non-Cartesian Imaging with Ramp-Up Acquizaiton

Zhang Qiong¹, Weng De he¹, Liu Wei¹

Eddy currents can be a significant impediment for application of oblique non-Cartesian techniques In permanent MRI system, In our work, eddy current distorted k-space was divided into two segments, and an effective approach to align peripheral k-space segment has been presented, which use physical gradient delays to counteract trajectory errors accumulated in oblique period. After that, eddy current induced trajectory errors were restricted in center non Lineal area, and the aligned peripheral k-space segment shows isotropic density, which makes the entire image reconstruction more stable and further saving time.