General 2D phase correction method for interleaved EPI reconstruction

Haiying Liu

doi:10.1117/12.330362

6 November 1998 General 2D phase correction method for interleaved EPI reconstruction

Haiying Liu

Proceedings Volume 3456, Mathematics of Data/Image Coding, Compression, and Encryption; (1998) https://doi.org/10.1117/12.330362
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Interleaved echo-planar imaging (EPI) and spiral imaging are two fast clinical magnetic resonance imaging (MRI) schemes that obtain k-space signal more efficiency for encoding an object. Since points along their k-space trajectories are from different echo times that may carry different phase and amplified errors originating from the static magnetic field inhomogeneity and nuclear spin relaxation, to form an image free of artifacts, both phase and amplitude errors need to be compensated properly in the image reconstruction. To address this issue, we have develop a general image reconstruction technique which is capable of accomplishing 2D phase correction for image reconstruction of interleaved EPI and spiral data. In this technique we formulated the image reconstructions as a problem of finding an optical solution to a set of linear algebraic equations corresponding to a specific imaging measurement. Furthermore, the phase errors, as well as other constraints known of the image, can be incorporated into these equations. The final solution can be obtained by solving the equation via an iterative procedure, free of k-space data gridding. Images with 2D phase correction have been successfully reconstructed using a set of imaging data acquired on a clinical MRI scanner. The significance of the work is that it has demonstrated that the 2D spatial phase correction can be accomplished for a set of interleaved EPI acquisition. Also, this is a flexible image reconstruction method for further improving the resulting image quality.

Citation Download Citation

Haiying Liu "General 2D phase correction method for interleaved EPI reconstruction", Proc. SPIE 3456, Mathematics of Data/Image Coding, Compression, and Encryption, (6 November 1998); https://doi.org/10.1117/12.330362

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