Figure 4: Optimization of location for motion guidance lines:
(A) Mean absolute difference in data consistency (DC) error at θ=0 and θgt as measured across 41 clinical motion trajectories. The observability of motion (ΔDC) is high as long as there is sufficient distance from the scout boundary. (B) Illustration of four guidance lines located at radius r from the k-space center. (C) Motion estimation error (RMSE) as a function of radius r for four guidance lines. Statistics generated for simulated motion across 41 trajectories. The motion accuracy improves as the radius r increases, given sufficient overlap with the scout region in k-space. (D) Motion estimation error as a function of number of guidance lines (fixed radius) as observed across 41 motion patterns. Additional guidance lines (>4) do not provide significant improvement in motion accuracy.