Sparse-Representation-Based Direct Minimum 𝐿^𝑝-Norm Algorithm for MRI Phase Unwrapping

Figure 2

A 128×128 phase dataset with shear, (a) its wrapped phase, and (b) its residue distribution including 6 residues. Unwrapped phase image using the (c) SDM𝐿^𝑃, (d) conventional minimum 𝐿^𝑝-norm, (e) PUMA, and (f) PHUN methods. Unwrapping errors are marked with red arrows.

(a)

(b)

(c)

(d)

(e)

(f)