Ghost reduction in echo-planar imaging by joint reconstruction of images and line-to-line delays and phase errors.

ABSTRACT: PURPOSE:To correct line-to-line delays and phase errors in echo-planar imaging (EPI). THEORY AND METHODS:EPI-trajectory auto-corrected image reconstruction (EPI-TrACR) is an iterative maximum-likelihood technique that exploits data redundancy provided by multiple receive coils between nearby lines of k-space to determine and correct line-to-line trajectory delays and phase errors that cause ghosting artifacts. EPI-TrACR was efficiently implemented using a segmented FFT and was applied to in vivo brain data acquired at 7 T across acceleration (1×-4×) and multishot factors (1-4 shots), and in a time series. RESULTS:EPI-TrACR reduced ghosting across all acceleration factors and multishot factors, compared to conventional calibrated reconstructions and the PAGE method. It also achieved consist

SUBMITTER: Ianni JD 

PROVIDER: S-EPMC5843534 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature