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Abstract #1282

Benchmarking Gradient Impulse Response Function (GIRF) Acquisition Strategies with Open-Source Measurement Software.

Michael Loecher1,2 and Daniel B Ennis1,2
1Radiology, Stanford University, Stanford, CA, United States, 2Radiology, Veterans Administration Health Care System, Palo Alto, CA, United States

Synopsis

Keywords: Software Tools, Software Tools, GIRF

Motivation: Gradient impulse response functions (GIRF) can correct MR imaging gradient-based errors that plague various techniques. Methods exist for acquiring and processing GIRFs, but there are few tools for comparisons.

Goal(s): To demonstrate an open-source GIRF acquisition, processing, and benchmark package (github.com/mloecher/GIRFbench), and describe initial testing strategies.

Approach: A range of test waveforms were designed in Pulseq to estimate the GIRF using both a field camera and thin-slice MRI-based methods. We compared the performance of these different GIRF estimation strategies, including post-processing filter choices.

Results: Estimated GIRFs reduced PC-MRI background velocity errors to ≤0.4% of VENC and corrected spiral trajectories to within ∆k=0.31 m-1.

Impact: We developed an open-source package (github.com/mloecher/GIRFbench) to acquire, process, and benchmark GIRF measurement strategies to better standardize and understand these techniques. Estimated GIRFs reduced PC-MRI background velocity errors to ≤0.4% of VENC and corrected spiral trajectories to within ∆k=0.31 m-1.

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Keywords