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Abstract #1367

QuickSamp: Towards simple, real-time-optimized Sampling Patterns for 3D Accelerated MRI

Jaehyeok Bae1, Cagan Alkan1, Shreyas Vasanawala1, John M Pauly1, and Kawin Setsompop1
1Stanford University, Stanford, CA, United States

Synopsis

Keywords: New Trajectories & Spatial Encoding Methods, Acquisition Methods, AI/ML Image reconstrtuction, Sampling pattern optimization

Motivation: Current sampling-optimization methods, such as AutoSamp, jointly train sampling-patterns with deep-learning(DL) models for accelerated MRI reconstructions, but suffer from complexity and lengthy protocol-specific optimization.

Goal(s): Design simpler sampling patterns that deliver comparable performance that can be created in real-time on a scan-by-scan basis.

Approach: By heuristically extracting insights from extensive AutoSamp results, we parameterized Voronoi-cell-area as a function of kr, and construct a variable-density radial hexagonal sampling parameterized for acceleration rates and coil configurations.

Results: Our method achieves reconstruction quality approaching AutoSamp, without case-specific training. We also derive heuristic relationships between sampling parameters, acceleration rates, and coil configurations.

Impact: Our method simplifies the complexity and drastically improve the speed of sampling pattern generation using only a few parameters. This eliminates extensive retraining, offering a practical alternative for optimizing MRI acquisition across different configurations and use cases.

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Keywords