FIGURE 3:

Postprocessing pipeline. (a) Compressed sensing (CS) reconstruction pipeline. Continuous golden-angle radial acquisition is for the magnetic resonance imaging (MRI) scan. The raw data are used to estimate coil sensitivity maps. The continuously acquired data are retrospectively windowed with a desired number of spokes to form an undersampled image time series. The undersampled k-data and coil sensitivity maps are used as input to the iterative CS algorithm to form the reconstructed images. (b) Continuous golden-angle radial sparse parallel (GRASP) data acquisition is performed during the rest, simulated static standing load phase, and the recovery phase. Following CS reconstruction, the image time series are corrected for bulk motion and coregistered. An optical flow algorithm is then used to calculate motion deformation maps. From these, the Lagrangian strain is calculated for each phase (rest through recovery).