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Abstract #2427

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

Zhang Qiong1, Weng De he1, Liu Wei1

1Siemens, Shen Zhen, Guang Dong, China

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.

Keywords

accumulated acquisition adoption align aligned alignment although among amplitude anisotropic applied assume assumption attached axis boundary calculation calibration caused china compensate compensation consistent constant correction corrections corresponds covering covers created deal degrade delay delays designs deviation distance distorted distortion divides dong earlier eddy effective efficient empirical endures equation equations equidistant error errors eventual exactly except excited extended extension extract ferromagnetic fitting fixed gradient gurney idea impediment imperfections implementation improvement induced invariant inverse isotropic item least lineal linear linearly location lost magnets make makes many materials measure measured modeled oblique obvious open overall people performance period peripheral permanent phantom physical pieces pole position process proportional proposals proposed quality radial ramp rapid readout real realign reasonable reconstructed reconstruction reduces related republic respectively restrict restricted samples scanner scheme segment segmentation segmented sensitive severe simplify situation slice slices space square stable successful superconducting synthesis synthesized system terms thin towards trajectory vary whole words