The gradient system transfer function (GSTF) constitutes a comprehensive tool for correcting k-space trajectory distortions due to gradient infidelities. We developed a new phantom-based measurement approach that allows determining the GSTF with a high frequency resolution without relying on long readout durations. Our first results include self- and B0 cross-terms with high SNR and resolutions below 10 Hz, resolving the true width of several resonances. The high resolution enables us to capture long-lasting eddy current effects, which is especially promising for the application of GSTF-based correction methods in, for example, diffusion-weighted imaging.
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