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Abstract #5206

Residual Acceleration Ghost Artifacts in MP2RAGE at 7T MRI and Their Correction with BART Reconstruction

Kwan-Jin Jung1 and Jonathan I Tamir2
1Biomedical Imaging Center, Beckman Institute, University of Illinois Urbana-Champaign, Urbana, IL, United States, 2Chandra Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX, United States

Synopsis

Keywords: Artifacts, Artifacts, Parallel Imaging, GRAPPA, BART, MP2RAGE

Motivation: Ghosting artifacts were observed on the INV2 contrast of MP2RAGE images obtained at 7T MRI using the standard scanner workflow with a parallel imaging factor of R=3x1. They could not be suppressed by changing the scan parameters.

Goal(s): To determine the cause of and reduce ghosting in MP2RAGE with an offline reconstruction.

Approach: Develop a pipeline for parallel imaging using BART including noise pre-whitening, coil compression, and ESPIRiT based reconstruction with Soft-SENSE.

Results: The ghosting artifacts were identified as residual aliasing from the scanner’s parallel imaging reconstruction, and they were suppressed by the offline reconstruction.

Impact: MP2RAGE is the most popular sequence for T1-weighted imaging at 7T. The ghosting artifacts on the INV2 contrast were attributed to the parallel acceleration. Our solution may contribute to a revised reconstruction of the MP2RAGE sequence.

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Keywords