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This is a Experimental Study study.

September 17, 2025

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

Puntos clave

Ghosting artifacts were suppressed with offline reconstruction methods, enhancing MP2RAGE quality.
Using BART reconstruction, which includes ESPIRiT, addressed residual aliasing from parallel imaging.
The MP2RAGE sequence is crucial for T1-weighted imaging at 7T, which is affected by ghosting artifacts.
Offline reconstruction of MP2RAGE could lead to improved imaging protocols and outcomes.

Resumen

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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