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Abstract #3393

Correcting Gradient Delays in Multi-Echo Rosette Trajectories with RING

Volkert Roeloffs1, Adam Michael Bush2, Suma Anand1, and Michael Lustig1
1EECS, UC Berkeley, Berkeley, CA, United States, 2Radiology, Stanford, Stanford, CA, United States

Rosette trajectories are sensitive to gradient delays as caused by eddy currents. Here, we use the RING method recently proposed for radial trajectories to correct for these delays. To this end, we approximate the center portion of the Rosette trajectory to be radial-like, determine delay constants, and correct the entire trajectory in a second step. First phantom and patient studies show that this simple correction method improves image quality in multi-echo Rosette imaging and leads to prolonged T2* values in derived maps. The small amount of required data renders echo-adaptive corrections feasible.

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