Meeting Banner
Abstract #4113

Combining Slice Dependent Center Frequency Adjustment and High Order Eddy Current Correction for Improved Multistation Diffusion Weighted Imaging

Dan Xu1, Gaohong Wu2, Jun Xie2, Kenichi Kanda2

1Applied Science Lab, GE Healthcare, Waukesha, WI, United States; 2MR Engineering, GE Healthcare, Waukesha, WI, United States

B0 field offset and eddy current induced image distortions often seen in diffusion weighted echo planar imaging can be worsened in multistation settings (e.g., whole body imaging), where the unmatched distortions at station boundaries can create sharp discontinuities, largely degrading image quality. We propose to use a combined high order eddy current and slice dependent center frequency correction to reduce image distortion and bulk shift. A 2-station phantom study shows that the proposed method is capable of minimizing station boundary discontinuities and slice shift trend.

Abstract PDF E-Poster Video

Keywords

according advantageous although amount apparent applied applies arrow arrows available axial axis blurring body boundaries boundary brain bulk calculation calculations calibrated calibration capable causes chemical coil collect collected collection combined compensation consideration constant corrected correcting correction corrections coverage create creating curvature curvatures curved cylinder degree dependent described diameter difficult diffusion discontinuities discontinuity distortion distortions dummy eddy effective either encoding ends engineering error especially except excitation field fitting free frequency generated geometric gradient green horizontal induction inhomogeneity involving largely linear localized long magnet makes marked matrix minimized minimizes near noise offset offsets often paper particularly phantom polynomial preparatory primarily propose proposed protocol pulse pulses quality real receiving reconstruction rectangular reduce reducing refocusing reformatted repetitions require residual resolution robustness saturation scanner section shape shim sides slice slight smooth smoothed space specifically spin station stations steady still subsequent susceptibility tanner text tilted tissue train transformed transmission trend unlike useful vertical water whole widely worsened