Reduction of Ghost Artifacts in ~(31)P EPSI Using a Gradient Impulse Response Model

摘要

Accelerated magnetic resonance spectroscopic imaging (MRSI) sequences like echo-planar spectroscopic imaging (EPSI) place high demands on the MR gradient system. Imperfections in gradient trajectories lead to ghost artifacts in conventionally reconstructed MRSI data due to phase inconsistencies between individual gradient echoes. The separate phase-corrected reconstruction of odd and even echo trains avoids these ghosts; however, this approach limits the spectral bandwidth, which is a disadvantage for ~(31)P MRSI at B_0 = 7T.