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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