FIGURE 7.

Image reconstruction of a simulated miscentered radial acquisition with various trajectories. The reference image depicts miscentered radial data reconstructed with the known miscentered trajectory. Reconstruction with the nominal trajectory results in severe contrast distortion within the object and strong streak artifacts. Use of the trajectory estimated from the proposed iterative GROG algorithm restores the true image contrast and removes residual artifacts beyond the improvement observed from reconstruction with the trajectory estimated in the pre-processing phase correction step. Difference images in the second row (enhanced for clarity) illustrate residual artifacts. Quantified root mean square error relative to the reference reconstruction is printed beneath the images.