Figure 3:

Typical k-space sampling patterns utilized in compressed sensing for mapping of the knee cartilage. (a) 2D acquisitions for one slice, p is the relaxation parameter direction and k_x is the readout direction, where k_y × p is randomly undersampled with Poisson disk in the mid-high frequencies. (b) 3D acquisition for one relaxation-weighted volume and (c) for one slice in the x direction (after FFT in k_x direction) the k_y × k_z × p sampled points follow a 3D Poisson disk pattern. (d) The sample points follow a radially variable density pattern, and (e) radial sampling with golden angle increments and different initial angle for each p.