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Abstract #1372

Instead of just undersampling, sample more and faster: 0.6mm isotropic MPRAGE at 7T in under 2 minutes

Thomas Yu1,2,3, Jocelyn Philippe1,2,3, Natalia Pato Montemayor1,2,3, Emilie Sleight4,5, Antoine Klauser1, Lina Bacha1,3, Tommaso Di Noto1,2,3, Bénédicte Maréchal1,2,3, Dominik Nickel6, Patrick Liebig6, Tobias Kober1,2,3, Tom Hilbert1,2,3, and Gian Franco Piredda1
1Advanced Clinical Imaging Technology, Siemens Healthineers International AG, Lausanne, Switzerland, 2Radiology, Lausanne University Hospital, Lausanne, Switzerland, 3LTS5, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, 4Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, 5Center for Biomedical Imaging, Geneva, Switzerland, 6Siemens Healthineers AG, Erlangen, Germany

Synopsis

Keywords: AI/ML Image Reconstruction, AI/ML Image Reconstruction, Neuro, Acquisition Methods

Motivation: Deep learning-based reconstructions could be used to further accelerate MR acquisitions by optimizing sequence parameters that reduce scan time, at the cost of reduced SNR, as an alternative to simply increasing undersampling factors.

Goal(s): To compare a clinical MPRAGE protocol (CS x5, TA: 4min) at 7T with a x12 undersampled acquisition (Fast-Standard) and a time-matched protocol with x5 undersampling but higher turbo factor and optimized parameters to preserve contrast (Fast-Optimized).

Approach: Reference and fast MPRAGE protocols were acquired in three subjects. Reconstructed images were compared qualitatively and quantitatively.

Results: Fast-Optimized scans were more comparable to the reference than the Fast-Standard scans.

Impact: This study demonstrates the effectiveness of using deep learning image reconstruction in combination with optimized sequence parameters for scan speed to further accelerate a clinical MPRAGE acquisition, in contrast to simply increasing undersampling factors.

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Keywords